TY  - JOUR
AU  - Milošević-Mitić, Vesna
AU  - Petrović, Ana
AU  - Anđelić, Nina
AU  - Jovanović, Miloš
PY  - 2024
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7753
AB  - Within the theory of thermo-elasticity, the temperature field of thin plates 
is commonly defined via two parameters: temperature in the mid-plane and 
linear temperature gradient normal to the mid-plane. First, the paper 
analytically proves the justification of that assumption in machine 
structures. Then, in an analytical closed form, applying the integral 
transformation method, the thin plate deflection caused by a constant 
temperature gradient is defined. It is shown that, in that case, the plate 
deflection does not depend on its thickness but only on the plate 
dimensions in the mid-plane. Analytically defined values are compared to 
corresponding values obtained by applying the thin plate finite element, 
where the temperature field is described using the two mentioned 
parameters. This finite element is defined and programmed within the 
Komips program package. The influence of the temperature gradient on 
the behavior of constructions mostly depends on the type of material. That 
is why the behavior of some structural elements made of brass, steel, and 
concrete is analyzed in this paper.
T2  - FME Transactions
T1  - The Influence of Temperature Gradient  on Thin Plates Bending
EP  - 135
IS  - 1
SP  - 128
VL  - 52
DO  - 10.5937/fme2401128M
ER  - 

@article{
author = "Milošević-Mitić, Vesna and Petrović, Ana and Anđelić, Nina and Jovanović, Miloš",
year = "2024",
abstract = "Within the theory of thermo-elasticity, the temperature field of thin plates 
is commonly defined via two parameters: temperature in the mid-plane and 
linear temperature gradient normal to the mid-plane. First, the paper 
analytically proves the justification of that assumption in machine 
structures. Then, in an analytical closed form, applying the integral 
transformation method, the thin plate deflection caused by a constant 
temperature gradient is defined. It is shown that, in that case, the plate 
deflection does not depend on its thickness but only on the plate 
dimensions in the mid-plane. Analytically defined values are compared to 
corresponding values obtained by applying the thin plate finite element, 
where the temperature field is described using the two mentioned 
parameters. This finite element is defined and programmed within the 
Komips program package. The influence of the temperature gradient on 
the behavior of constructions mostly depends on the type of material. That 
is why the behavior of some structural elements made of brass, steel, and 
concrete is analyzed in this paper.",
journal = "FME Transactions",
title = "The Influence of Temperature Gradient  on Thin Plates Bending",
pages = "135-128",
number = "1",
volume = "52",
doi = "10.5937/fme2401128M"
}

Milošević-Mitić, V., Petrović, A., Anđelić, N.,& Jovanović, M.. (2024). The Influence of Temperature Gradient  on Thin Plates Bending. in FME Transactions, 52(1), 128-135.
https://doi.org/10.5937/fme2401128M

Milošević-Mitić V, Petrović A, Anđelić N, Jovanović M. The Influence of Temperature Gradient  on Thin Plates Bending. in FME Transactions. 2024;52(1):128-135.
doi:10.5937/fme2401128M .

Milošević-Mitić, Vesna, Petrović, Ana, Anđelić, Nina, Jovanović, Miloš, "The Influence of Temperature Gradient  on Thin Plates Bending" in FME Transactions, 52, no. 1 (2024):128-135,
https://doi.org/10.5937/fme2401128M . .

TY  - JOUR
AU  - Đurđević, Đorđe
AU  - Anđelić, Nina
AU  - Đurđević, Andrijana
AU  - Petrović, Ana
AU  - Milošević-Mitić, Vesna
AU  - Ivljanin, Bojan
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6997
AB  - The paper presents analytical and numerical determina-tion of the equivalent stress and strain of the open section thin-walled ‘’ cantilever beams loaded with torsion. Ana-lytical calculation was used to calculate the equivalent stress and strain values for the model encastred across the entire cross-section at one end, while the other end is free (model 1). The finite element method is applied for the calculation of the same ‘’ cantilever beam model exposed to torsion, and the stress and strain values are obtained by numerical calculation. Numerical simulations have been performed using KOMIPS software. Analytical and numerical results are compared and discussed. In this paper, a numerical model for constrained torsion is also created in ABAQUS® and SolidWorks® software. A cantilever beam with an omega profile is encastred at one end, while at the other end there is a welded plate (model 2). Numerical models are created, and static calculation is done using the finite element method. The zones of stress concentration are identified and presented. Finally, the equivalent stress values of models 1 and 2 are compared. Conclusions obtained by examining this type of structures may be involved in the design process of new similar structures. The findings obtained during the implementation of this work can be directly applied to iden-tify the behaviour of real structures in their working condi-tions.
T2  - Structural integrity and life/Integritet i vek konstrukcija
T1  - Thin-walled omega profile exposed to constrained torsion-analytical and numerical stress and strain calculation
T1  - Tankozidi omega profil pri ograničenom uvijanju-analitički i numerički proračun napona i deformacija
EP  - 229
IS  - 2
SP  - 225
VL  - 23
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6997
ER  - 

@article{
author = "Đurđević, Đorđe and Anđelić, Nina and Đurđević, Andrijana and Petrović, Ana and Milošević-Mitić, Vesna and Ivljanin, Bojan",
year = "2023",
abstract = "The paper presents analytical and numerical determina-tion of the equivalent stress and strain of the open section thin-walled ‘’ cantilever beams loaded with torsion. Ana-lytical calculation was used to calculate the equivalent stress and strain values for the model encastred across the entire cross-section at one end, while the other end is free (model 1). The finite element method is applied for the calculation of the same ‘’ cantilever beam model exposed to torsion, and the stress and strain values are obtained by numerical calculation. Numerical simulations have been performed using KOMIPS software. Analytical and numerical results are compared and discussed. In this paper, a numerical model for constrained torsion is also created in ABAQUS® and SolidWorks® software. A cantilever beam with an omega profile is encastred at one end, while at the other end there is a welded plate (model 2). Numerical models are created, and static calculation is done using the finite element method. The zones of stress concentration are identified and presented. Finally, the equivalent stress values of models 1 and 2 are compared. Conclusions obtained by examining this type of structures may be involved in the design process of new similar structures. The findings obtained during the implementation of this work can be directly applied to iden-tify the behaviour of real structures in their working condi-tions.",
journal = "Structural integrity and life/Integritet i vek konstrukcija",
title = "Thin-walled omega profile exposed to constrained torsion-analytical and numerical stress and strain calculation, Tankozidi omega profil pri ograničenom uvijanju-analitički i numerički proračun napona i deformacija",
pages = "229-225",
number = "2",
volume = "23",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6997"
}

Đurđević, Đ., Anđelić, N., Đurđević, A., Petrović, A., Milošević-Mitić, V.,& Ivljanin, B.. (2023). Thin-walled omega profile exposed to constrained torsion-analytical and numerical stress and strain calculation. in Structural integrity and life/Integritet i vek konstrukcija, 23(2), 225-229.
https://hdl.handle.net/21.15107/rcub_machinery_6997

Đurđević Đ, Anđelić N, Đurđević A, Petrović A, Milošević-Mitić V, Ivljanin B. Thin-walled omega profile exposed to constrained torsion-analytical and numerical stress and strain calculation. in Structural integrity and life/Integritet i vek konstrukcija. 2023;23(2):225-229.
https://hdl.handle.net/21.15107/rcub_machinery_6997 .

Đurđević, Đorđe, Anđelić, Nina, Đurđević, Andrijana, Petrović, Ana, Milošević-Mitić, Vesna, Ivljanin, Bojan, "Thin-walled omega profile exposed to constrained torsion-analytical and numerical stress and strain calculation" in Structural integrity and life/Integritet i vek konstrukcija, 23, no. 2 (2023):225-229,
https://hdl.handle.net/21.15107/rcub_machinery_6997 .

TY  - CONF
AU  - Petrović, Ana
AU  - Momčilović, Nikola
AU  - Jovanović, Miloš
AU  - Petrović, Branko
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6012
AB  - In this paper, structural reliability is applied to compare the original
bucket wheel boom (BWB) of excavator SchRs 740 and the series of boom
structures obtained by lengthening the original boom from 0 to 10 m.
Stress field of BWE is acquired using finite element method. Then, stresses
and yield criterion are modeled using probability density functions to
account for uncertainties in their randomness. This stochastic approach is
used to determine BWB’s reliability, reliability index and probability of
failure, with respect to various cases of optimization, namely, structure
lengthening. Consequently, it enabled the evaluation, quantification and
comparison of overall response of the similar structures taking into
account range of stress rather than conventionally based single value
approach. So, structural reliability approach can be used to evaluate,
compare similar structures and thus, provide more sophisticated
assessment than most of the structural analysis that are deterministic in
their nature.
C3  - Proceedings of the XXIV International Conference MHCL’22
T1  - Optimization of the bucket wheel boom length using structural reliability approach
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6012
ER  - 

@conference{
author = "Petrović, Ana and Momčilović, Nikola and Jovanović, Miloš and Petrović, Branko",
year = "2022",
abstract = "In this paper, structural reliability is applied to compare the original
bucket wheel boom (BWB) of excavator SchRs 740 and the series of boom
structures obtained by lengthening the original boom from 0 to 10 m.
Stress field of BWE is acquired using finite element method. Then, stresses
and yield criterion are modeled using probability density functions to
account for uncertainties in their randomness. This stochastic approach is
used to determine BWB’s reliability, reliability index and probability of
failure, with respect to various cases of optimization, namely, structure
lengthening. Consequently, it enabled the evaluation, quantification and
comparison of overall response of the similar structures taking into
account range of stress rather than conventionally based single value
approach. So, structural reliability approach can be used to evaluate,
compare similar structures and thus, provide more sophisticated
assessment than most of the structural analysis that are deterministic in
their nature.",
journal = "Proceedings of the XXIV International Conference MHCL’22",
title = "Optimization of the bucket wheel boom length using structural reliability approach",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6012"
}

Petrović, A., Momčilović, N., Jovanović, M.,& Petrović, B.. (2022). Optimization of the bucket wheel boom length using structural reliability approach. in Proceedings of the XXIV International Conference MHCL’22.
https://hdl.handle.net/21.15107/rcub_machinery_6012

Petrović A, Momčilović N, Jovanović M, Petrović B. Optimization of the bucket wheel boom length using structural reliability approach. in Proceedings of the XXIV International Conference MHCL’22. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_6012 .

Petrović, Ana, Momčilović, Nikola, Jovanović, Miloš, Petrović, Branko, "Optimization of the bucket wheel boom length using structural reliability approach" in Proceedings of the XXIV International Conference MHCL’22 (2022),
https://hdl.handle.net/21.15107/rcub_machinery_6012 .

TY  - CONF
AU  - Paunić, Milovan
AU  - Černicin, Vladimir
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5677
AB  - When making mechanical components, geometric imperfections are common, which in certain cases can cause a weak spot or some form of crack. Depending on the intensity and position of the action of forces on the mechanical component, its bearing capacity or load that the structure can carry with a given degree of safety directly results. The paper will compare the critical values of the stress intensity factor, as a basic element of fracture mechanics, obtained by empirical formulas and the values obtained by applying the finite element method. Using Abaqus, the values were verified numerically and the results of the analysis can be considered validated. The results showed deviations in the acceptable range and the application of the finite element method to the analysis of cracks in the material confirmed that Abaqus can also be used as an excellent tool in the analysis of fracture mechanics.
PB  - University of Belgrade Faculty of Mechanical Engineering, Belgrade
C3  - Proceedings of 8th International Conference of Industrial Engineering
T1  - APPLICATION OF FINITE ELEMENT METHOD FOR ANALYSIS THE PARAMETERS OF FRACTURE MECHANICS
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5677
ER  - 

@conference{
author = "Paunić, Milovan and Černicin, Vladimir",
year = "2022",
abstract = "When making mechanical components, geometric imperfections are common, which in certain cases can cause a weak spot or some form of crack. Depending on the intensity and position of the action of forces on the mechanical component, its bearing capacity or load that the structure can carry with a given degree of safety directly results. The paper will compare the critical values of the stress intensity factor, as a basic element of fracture mechanics, obtained by empirical formulas and the values obtained by applying the finite element method. Using Abaqus, the values were verified numerically and the results of the analysis can be considered validated. The results showed deviations in the acceptable range and the application of the finite element method to the analysis of cracks in the material confirmed that Abaqus can also be used as an excellent tool in the analysis of fracture mechanics.",
publisher = "University of Belgrade Faculty of Mechanical Engineering, Belgrade",
journal = "Proceedings of 8th International Conference of Industrial Engineering",
title = "APPLICATION OF FINITE ELEMENT METHOD FOR ANALYSIS THE PARAMETERS OF FRACTURE MECHANICS",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5677"
}

Paunić, M.,& Černicin, V.. (2022). APPLICATION OF FINITE ELEMENT METHOD FOR ANALYSIS THE PARAMETERS OF FRACTURE MECHANICS. in Proceedings of 8th International Conference of Industrial Engineering
University of Belgrade Faculty of Mechanical Engineering, Belgrade..
https://hdl.handle.net/21.15107/rcub_machinery_5677

Paunić M, Černicin V. APPLICATION OF FINITE ELEMENT METHOD FOR ANALYSIS THE PARAMETERS OF FRACTURE MECHANICS. in Proceedings of 8th International Conference of Industrial Engineering. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_5677 .

Paunić, Milovan, Černicin, Vladimir, "APPLICATION OF FINITE ELEMENT METHOD FOR ANALYSIS THE PARAMETERS OF FRACTURE MECHANICS" in Proceedings of 8th International Conference of Industrial Engineering (2022),
https://hdl.handle.net/21.15107/rcub_machinery_5677 .

TY  - JOUR
AU  - Đurđević, Đorđe
AU  - Đurđević, Andrijana
AU  - Anđelić, Nina
AU  - Milošević-Mitić, Vesna
AU  - Antić, Katarina
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5491
AB  - The aim of this paper is to present the application of thin-walled beams on cargo raft load-bearing structure from the aspect of strength and reliability. The beams have an open cross section. Analytical and numerical determination of equivalent stresses and deformations of open section thin-walled ‘U’ and ‘Z’ cantilever beams, loaded with torsion, is presented. Work is divided into three parts. In the first part, equivalent stress and deformation are obtained analytically for cantilever beam model in the whole cross section. In the second part, the finite element method is applied in beam models, and the results are compared with the analytical calculation. The third part presents the profiles installed in load-bearing structures of vessels (rafts) and solutions are shown to apply results of the presented analyses in order to increase reliability. Finally, the design calculation of the raft load-bearing structure is shown.
T2  - Integritet i vek konstrukcija
T1  - STRENGTH AND RELIABILITY OF OPEN CROSS-SECTIONS THIN WALL BEAMS IN A  RAFT LOAD-BEARING STRUCTURE
EP  - 338
IS  - 3
SP  - 335
VL  - 22
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5491
ER  - 

@article{
author = "Đurđević, Đorđe and Đurđević, Andrijana and Anđelić, Nina and Milošević-Mitić, Vesna and Antić, Katarina",
year = "2022",
abstract = "The aim of this paper is to present the application of thin-walled beams on cargo raft load-bearing structure from the aspect of strength and reliability. The beams have an open cross section. Analytical and numerical determination of equivalent stresses and deformations of open section thin-walled ‘U’ and ‘Z’ cantilever beams, loaded with torsion, is presented. Work is divided into three parts. In the first part, equivalent stress and deformation are obtained analytically for cantilever beam model in the whole cross section. In the second part, the finite element method is applied in beam models, and the results are compared with the analytical calculation. The third part presents the profiles installed in load-bearing structures of vessels (rafts) and solutions are shown to apply results of the presented analyses in order to increase reliability. Finally, the design calculation of the raft load-bearing structure is shown.",
journal = "Integritet i vek konstrukcija",
title = "STRENGTH AND RELIABILITY OF OPEN CROSS-SECTIONS THIN WALL BEAMS IN A  RAFT LOAD-BEARING STRUCTURE",
pages = "338-335",
number = "3",
volume = "22",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5491"
}

Đurđević, Đ., Đurđević, A., Anđelić, N., Milošević-Mitić, V.,& Antić, K.. (2022). STRENGTH AND RELIABILITY OF OPEN CROSS-SECTIONS THIN WALL BEAMS IN A  RAFT LOAD-BEARING STRUCTURE. in Integritet i vek konstrukcija, 22(3), 335-338.
https://hdl.handle.net/21.15107/rcub_machinery_5491

Đurđević Đ, Đurđević A, Anđelić N, Milošević-Mitić V, Antić K. STRENGTH AND RELIABILITY OF OPEN CROSS-SECTIONS THIN WALL BEAMS IN A  RAFT LOAD-BEARING STRUCTURE. in Integritet i vek konstrukcija. 2022;22(3):335-338.
https://hdl.handle.net/21.15107/rcub_machinery_5491 .

Đurđević, Đorđe, Đurđević, Andrijana, Anđelić, Nina, Milošević-Mitić, Vesna, Antić, Katarina, "STRENGTH AND RELIABILITY OF OPEN CROSS-SECTIONS THIN WALL BEAMS IN A  RAFT LOAD-BEARING STRUCTURE" in Integritet i vek konstrukcija, 22, no. 3 (2022):335-338,
https://hdl.handle.net/21.15107/rcub_machinery_5491 .

TY  - CONF
AU  - Paunić, Milovan
AU  - Černicin, Vladimir
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5680
AB  - Composite materials are widely used in different industries because of their unique characteristics that can be adapted depending on the application. Prediction of mechanical properties before the production process enables time-saving and optimization of geometry and materials. The purpose of this paper is to show the steps in virtual modeling of the elementary unit of the unidirectional composite. The first step is the computer generation of the virtual domain that needs to geometrically match the experimental sample. After that, the mesh of finite elements must be defined, and apply algorithms for periodic border conditions. The next step is setting the boundary conditions and forces. After obtaining contour plots (homogenization method) mechanical characteristics and effective elastic constants of the composite can be predicted. Thanks to the implementation of the finite element method in the ABAQUS program, it is possible to predict the mechanical characteristics of the composite depending on the variation of different parameters of the composite.
PB  - University of Belgrade Faculty of Mechanical Engineering, Belgrade
C3  - Proceedings of 8th International Conference of Industrial Engineering
T1  - VIRTUAL MODEL GENERATION OF REPRESENTATIVE VOLUME ELEMENT FOR UNIDIRECTIONAL COMPOSITE
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5680
ER  - 

@conference{
author = "Paunić, Milovan and Černicin, Vladimir",
year = "2022",
abstract = "Composite materials are widely used in different industries because of their unique characteristics that can be adapted depending on the application. Prediction of mechanical properties before the production process enables time-saving and optimization of geometry and materials. The purpose of this paper is to show the steps in virtual modeling of the elementary unit of the unidirectional composite. The first step is the computer generation of the virtual domain that needs to geometrically match the experimental sample. After that, the mesh of finite elements must be defined, and apply algorithms for periodic border conditions. The next step is setting the boundary conditions and forces. After obtaining contour plots (homogenization method) mechanical characteristics and effective elastic constants of the composite can be predicted. Thanks to the implementation of the finite element method in the ABAQUS program, it is possible to predict the mechanical characteristics of the composite depending on the variation of different parameters of the composite.",
publisher = "University of Belgrade Faculty of Mechanical Engineering, Belgrade",
journal = "Proceedings of 8th International Conference of Industrial Engineering",
title = "VIRTUAL MODEL GENERATION OF REPRESENTATIVE VOLUME ELEMENT FOR UNIDIRECTIONAL COMPOSITE",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5680"
}

Paunić, M.,& Černicin, V.. (2022). VIRTUAL MODEL GENERATION OF REPRESENTATIVE VOLUME ELEMENT FOR UNIDIRECTIONAL COMPOSITE. in Proceedings of 8th International Conference of Industrial Engineering
University of Belgrade Faculty of Mechanical Engineering, Belgrade..
https://hdl.handle.net/21.15107/rcub_machinery_5680

Paunić M, Černicin V. VIRTUAL MODEL GENERATION OF REPRESENTATIVE VOLUME ELEMENT FOR UNIDIRECTIONAL COMPOSITE. in Proceedings of 8th International Conference of Industrial Engineering. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_5680 .

Paunić, Milovan, Černicin, Vladimir, "VIRTUAL MODEL GENERATION OF REPRESENTATIVE VOLUME ELEMENT FOR UNIDIRECTIONAL COMPOSITE" in Proceedings of 8th International Conference of Industrial Engineering (2022),
https://hdl.handle.net/21.15107/rcub_machinery_5680 .

TY  - THES
AU  - Vučetić, Filip
PY  - 2021
UR  - https://nardus.mpn.gov.rs/handle/123456789/18381
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6524
AB  - Biomaterijali namenjeni za izradu ortopedskih rekonstruktivnih pločica su boljih mehaničkih karakteristika u odnosu na kosti, a ipak u velikom broju slučajeva dolazi do otkaza pločica usled zamornog oštećenja. Jasno je da otkazi pločica za fiksaciju preloma dovode do problema u procesu lečenja i potrebe za ponovnom operacijom pacijenata. Pored materijala i geometrije, iskustvo i znanje ortopedskog hirurga su jedan od najbitnijih faktora koji doprinose učestalosti zamornih otkaza pločica. U slučaju neadekvatne ugradnje pločice će biti podvrgnute preopterećenju od samog početka eksploatacije, što pogoduje inicijaciji prsline.
Jedan od najčešće korišćenih biokompatibilnih materijala za unutrašnju fiksaciju preloma kostiju je dvofazna alfa-beta legura titana Ti-6Al-4V. Cilj istraživanja doktorske disertacije je da se utvrdi ponašanje rekonstruktivnih biomedicinskih pločica u prisustvu prslina na mestima koncentracije napona i da se utvrdi brzina rasta prslina za različite geometrije, na osnovu čega im je moguće proceniti integritet i preostali radni vek. U tu svrhu, eksperimentalno su određene zatezne karakteristike i parametri mehanike loma legure Ti-6Al-4V u cilju korišćenja podataka u numeričkim simulacijama, dok su udarne karakteristike ispitane na instrumentiranom klatnu u cilju boljeg razumevanja ponašanja samog materijala. Umesto komplikovanih eksperimentalnih ispitivanja, primenjeni su postupci numeričkih simulacija ponašanja ortopedskih pločica od Ti-6Al-4V legure titana u prisustvu zamornih prslina, opterećenih na savijanje u četiri tačke, prvenstveno zbog nemogućnosti primene mernih folija na geometrijama pločica. Takođe, numeričke simulacije predstavljaju bržu i jeftiniju alternativu eksperimentalnim ispitivanjima. Geometrija i modeli pločica rađeni su u programu CATIA, a simulacija rasta prsline proširenom metodom konačnih elemenata (PMKE) u programu ANSYS. U simulacijama je korišćeno opterećenje (moment savijanja) koje se javlja na čovekovoj potkolenici tokom hoda, a uzete su u obzir i različite telesne mase pacijenta: 60, 90 i 120 kg. Analiza je rađena za 5 različitih geometrija pločica. Analiza je rađena isključivo sa mehaničkog aspekta, dok uticaj korozivne sredine čovekovog organizma i biokompatibilnost materijala nisu uzeti u razmatranje.
Postoji više metoda za tretiranje materijala u cilju poboljšanja njegovih određenih karakteristika. Jedan od načina za poboljšanje površinskih karakteristika materijala je lasersko ojačavanje materijala (LSP). Razlog za primenu laserskog ojačavanja na leguri titana je istraživanje mogućnosti lokalnog poboljšanja mehaničkih karakteristika i mikrogeometrijskih karakteristika površine, kao i unošenja pritisnih zaostalih napona koji bi doprineli otpornosti na iniciranje prslina, naročito na mestima koncentracije napona. Ispitivanja su rađena na tri grupe uzoraka i pod tri različita tretmana pikosekundnim laserom Nd:YAG. Analiza je rađena sa aspekta mikrostrukture, površinske hrapavosti i mikrotvrdoće.
AB  - Biomaterials intended for orthopaedic plates manufacturing are of much higher mechanical properties relative to the bone itself and still there are many cases where those plates fracture in service with fatigue as the main failure mode. This causes the problem with healing process and requires that the patients undergo another surgery. Apart from materials and geometry, experience and knowledge of the orthopaedic surgeon is one of the important factors contributing to the frequency of fatigue failures. If incorrectly implanted, plates will be subjected to overloading from the start, which is convenient for crack initiation.
One of the most commonly used biocompatible materials for internal bone fixation is two phase alpha-beta titanium alloy Ti-6Al-4V. Focus of this doctoral dissertation is to determine the behaviour of reconstructive biomedical plates in the presence of cracks at the stress concentration locations and to obtain crack growth rates for different plate geometries which are to be used as a basis for structural integrity and life assessment. Experimental investigations of tensile and fracture mechanics parameters of Ti-6Al-4V alloy were conducted to be used in numerical simulations, while impact characteristics, tested on instrumented Charpy pendulum, were investigated for the purpose of better understanding of the material. Instead of complicated experimental four point bend testing of orthopaedic plates in the presence of cracks, numerical simulations were employed, mainly due to inability of measurement foils to be used on given plate geometries. Also, numerical simulations are time and cost efficient when compared to experimental testing. Geometries and models of plates are defined in CATIA software, while extended finite element method (XFEM) crack growth simulations were made in ANSYS. Loads (bending moments) correspond to the ones occurring in human tibia during gait cycle for different body weights: 60, 90 and 120 kg. Analysis was conducted on 5 different plate geometries. Analysis was done only from the mechanical aspect and the influence of corrosive environment of the human body was not taken into consideration.
There are many methods for treatment of materials for the purpose of improving its certain characteristics. One of the methods for surface characteristics improvement is laser shock peening. Reason for utilising the laser shock peening on titanium alloy is to research the possibilities of local improvement of mechanical and micro-geometrical properties, as well as inducing the compressive residual stresses which should contribute to the crack initiation resistance, especially at the stress concentration locations. Testing was conducted on three types of samples under three different treatments with picosecond laser Nd:YAG. Analysis was made from the aspect of microstructure, surface roughness and microhardness.
T2  - Univerzitet u Beogradu, Mašinski fakultet
T1  - Uticaj koncentracije napona i pojave prsline na preostali radni vek biomaterijala za rekonstruktivne pločice
T1  - Influence of stress concentration and crack initiation on remaining life of biomaterials for reconstructive plates
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6524
ER  - 

@phdthesis{
author = "Vučetić, Filip",
year = "2021",
abstract = "Biomaterijali namenjeni za izradu ortopedskih rekonstruktivnih pločica su boljih mehaničkih karakteristika u odnosu na kosti, a ipak u velikom broju slučajeva dolazi do otkaza pločica usled zamornog oštećenja. Jasno je da otkazi pločica za fiksaciju preloma dovode do problema u procesu lečenja i potrebe za ponovnom operacijom pacijenata. Pored materijala i geometrije, iskustvo i znanje ortopedskog hirurga su jedan od najbitnijih faktora koji doprinose učestalosti zamornih otkaza pločica. U slučaju neadekvatne ugradnje pločice će biti podvrgnute preopterećenju od samog početka eksploatacije, što pogoduje inicijaciji prsline.
Jedan od najčešće korišćenih biokompatibilnih materijala za unutrašnju fiksaciju preloma kostiju je dvofazna alfa-beta legura titana Ti-6Al-4V. Cilj istraživanja doktorske disertacije je da se utvrdi ponašanje rekonstruktivnih biomedicinskih pločica u prisustvu prslina na mestima koncentracije napona i da se utvrdi brzina rasta prslina za različite geometrije, na osnovu čega im je moguće proceniti integritet i preostali radni vek. U tu svrhu, eksperimentalno su određene zatezne karakteristike i parametri mehanike loma legure Ti-6Al-4V u cilju korišćenja podataka u numeričkim simulacijama, dok su udarne karakteristike ispitane na instrumentiranom klatnu u cilju boljeg razumevanja ponašanja samog materijala. Umesto komplikovanih eksperimentalnih ispitivanja, primenjeni su postupci numeričkih simulacija ponašanja ortopedskih pločica od Ti-6Al-4V legure titana u prisustvu zamornih prslina, opterećenih na savijanje u četiri tačke, prvenstveno zbog nemogućnosti primene mernih folija na geometrijama pločica. Takođe, numeričke simulacije predstavljaju bržu i jeftiniju alternativu eksperimentalnim ispitivanjima. Geometrija i modeli pločica rađeni su u programu CATIA, a simulacija rasta prsline proširenom metodom konačnih elemenata (PMKE) u programu ANSYS. U simulacijama je korišćeno opterećenje (moment savijanja) koje se javlja na čovekovoj potkolenici tokom hoda, a uzete su u obzir i različite telesne mase pacijenta: 60, 90 i 120 kg. Analiza je rađena za 5 različitih geometrija pločica. Analiza je rađena isključivo sa mehaničkog aspekta, dok uticaj korozivne sredine čovekovog organizma i biokompatibilnost materijala nisu uzeti u razmatranje.
Postoji više metoda za tretiranje materijala u cilju poboljšanja njegovih određenih karakteristika. Jedan od načina za poboljšanje površinskih karakteristika materijala je lasersko ojačavanje materijala (LSP). Razlog za primenu laserskog ojačavanja na leguri titana je istraživanje mogućnosti lokalnog poboljšanja mehaničkih karakteristika i mikrogeometrijskih karakteristika površine, kao i unošenja pritisnih zaostalih napona koji bi doprineli otpornosti na iniciranje prslina, naročito na mestima koncentracije napona. Ispitivanja su rađena na tri grupe uzoraka i pod tri različita tretmana pikosekundnim laserom Nd:YAG. Analiza je rađena sa aspekta mikrostrukture, površinske hrapavosti i mikrotvrdoće., Biomaterials intended for orthopaedic plates manufacturing are of much higher mechanical properties relative to the bone itself and still there are many cases where those plates fracture in service with fatigue as the main failure mode. This causes the problem with healing process and requires that the patients undergo another surgery. Apart from materials and geometry, experience and knowledge of the orthopaedic surgeon is one of the important factors contributing to the frequency of fatigue failures. If incorrectly implanted, plates will be subjected to overloading from the start, which is convenient for crack initiation.
One of the most commonly used biocompatible materials for internal bone fixation is two phase alpha-beta titanium alloy Ti-6Al-4V. Focus of this doctoral dissertation is to determine the behaviour of reconstructive biomedical plates in the presence of cracks at the stress concentration locations and to obtain crack growth rates for different plate geometries which are to be used as a basis for structural integrity and life assessment. Experimental investigations of tensile and fracture mechanics parameters of Ti-6Al-4V alloy were conducted to be used in numerical simulations, while impact characteristics, tested on instrumented Charpy pendulum, were investigated for the purpose of better understanding of the material. Instead of complicated experimental four point bend testing of orthopaedic plates in the presence of cracks, numerical simulations were employed, mainly due to inability of measurement foils to be used on given plate geometries. Also, numerical simulations are time and cost efficient when compared to experimental testing. Geometries and models of plates are defined in CATIA software, while extended finite element method (XFEM) crack growth simulations were made in ANSYS. Loads (bending moments) correspond to the ones occurring in human tibia during gait cycle for different body weights: 60, 90 and 120 kg. Analysis was conducted on 5 different plate geometries. Analysis was done only from the mechanical aspect and the influence of corrosive environment of the human body was not taken into consideration.
There are many methods for treatment of materials for the purpose of improving its certain characteristics. One of the methods for surface characteristics improvement is laser shock peening. Reason for utilising the laser shock peening on titanium alloy is to research the possibilities of local improvement of mechanical and micro-geometrical properties, as well as inducing the compressive residual stresses which should contribute to the crack initiation resistance, especially at the stress concentration locations. Testing was conducted on three types of samples under three different treatments with picosecond laser Nd:YAG. Analysis was made from the aspect of microstructure, surface roughness and microhardness.",
journal = "Univerzitet u Beogradu, Mašinski fakultet",
title = "Uticaj koncentracije napona i pojave prsline na preostali radni vek biomaterijala za rekonstruktivne pločice, Influence of stress concentration and crack initiation on remaining life of biomaterials for reconstructive plates",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6524"
}

Vučetić, F.. (2021). Uticaj koncentracije napona i pojave prsline na preostali radni vek biomaterijala za rekonstruktivne pločice. in Univerzitet u Beogradu, Mašinski fakultet.
https://hdl.handle.net/21.15107/rcub_machinery_6524

Vučetić F. Uticaj koncentracije napona i pojave prsline na preostali radni vek biomaterijala za rekonstruktivne pločice. in Univerzitet u Beogradu, Mašinski fakultet. 2021;.
https://hdl.handle.net/21.15107/rcub_machinery_6524 .

Vučetić, Filip, "Uticaj koncentracije napona i pojave prsline na preostali radni vek biomaterijala za rekonstruktivne pločice" in Univerzitet u Beogradu, Mašinski fakultet (2021),
https://hdl.handle.net/21.15107/rcub_machinery_6524 .

TY  - JOUR
AU  - Durdević, Đorđe
AU  - Sedmak, Simon
AU  - Đurđević, Andrijana
AU  - Anđelić, Nina
AU  - Maneski, Taško
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3515
AB  - Development and calculation of the base supporting struc-ture used for mining equipment is the aim of the paper. The base structure is intended for the installation of electronic communication and power equipment and devices that supply and manage mining equipment. The first part of the paper covers the existing solutions, and the second part shows the development of a new solution. Design solution of a new base structure is presented, a calculation of the base according to valid standards and regulations, and the numerical determination of equivalent stress and strain by Abaqus (R) software. Finally, the performed solution is given.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity and Life-Integritet I Vek Konstrukcija
T1  - Development and calculation of supporting structure for mining power equipment
EP  - 177
IS  - 2
SP  - 173
VL  - 21
UR  - https://hdl.handle.net/21.15107/rcub_machinery_3515
ER  - 

@article{
author = "Durdević, Đorđe and Sedmak, Simon and Đurđević, Andrijana and Anđelić, Nina and Maneski, Taško",
year = "2021",
abstract = "Development and calculation of the base supporting struc-ture used for mining equipment is the aim of the paper. The base structure is intended for the installation of electronic communication and power equipment and devices that supply and manage mining equipment. The first part of the paper covers the existing solutions, and the second part shows the development of a new solution. Design solution of a new base structure is presented, a calculation of the base according to valid standards and regulations, and the numerical determination of equivalent stress and strain by Abaqus (R) software. Finally, the performed solution is given.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life-Integritet I Vek Konstrukcija",
title = "Development and calculation of supporting structure for mining power equipment",
pages = "177-173",
number = "2",
volume = "21",
url = "https://hdl.handle.net/21.15107/rcub_machinery_3515"
}

Durdević, Đ., Sedmak, S., Đurđević, A., Anđelić, N.,& Maneski, T.. (2021). Development and calculation of supporting structure for mining power equipment. in Structural Integrity and Life-Integritet I Vek Konstrukcija
Institut za ispitivanje materijala, Beograd., 21(2), 173-177.
https://hdl.handle.net/21.15107/rcub_machinery_3515

Durdević Đ, Sedmak S, Đurđević A, Anđelić N, Maneski T. Development and calculation of supporting structure for mining power equipment. in Structural Integrity and Life-Integritet I Vek Konstrukcija. 2021;21(2):173-177.
https://hdl.handle.net/21.15107/rcub_machinery_3515 .

Durdević, Đorđe, Sedmak, Simon, Đurđević, Andrijana, Anđelić, Nina, Maneski, Taško, "Development and calculation of supporting structure for mining power equipment" in Structural Integrity and Life-Integritet I Vek Konstrukcija, 21, no. 2 (2021):173-177,
https://hdl.handle.net/21.15107/rcub_machinery_3515 .

TY  - JOUR
AU  - Sedmak, Aleksandar
AU  - Hemer, Abubkr
AU  - Sedmak, Simon
AU  - Milović, Ljubica
AU  - Grbović, Aleksandar
AU  - Cabrilo, Aleksandar
AU  - Kljajin, Milan
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3508
AB  - Fatigue crack growth through different welded joint regions was investigated, in terms of welded joint geometry and fatigue crack position. In the first phase of investigation, numerical simulation of crack growth in a welded joint made of steel P460NL1 was performed using extended Finite Element Methods (xFEM). Numerical models employed Paris law, using experimentally determined coefficients for each welded joint zone. Weld geometry was varied by using different heat affected zone (HAZ) widths, i.e. fatigue crack lengths. The second stage involved similar numerical models with different material (Protac 500). Fatigue lives for regions in both models were then compared.
PB  - Elsevier Sci Ltd, Oxford
T2  - International Journal of Fatigue
T1  - Welded joint geometry effect on fatigue crack growth resistance in different metallic materials
VL  - 150
DO  - 10.1016/j.ijfatigue.2021.106298
ER  - 

@article{
author = "Sedmak, Aleksandar and Hemer, Abubkr and Sedmak, Simon and Milović, Ljubica and Grbović, Aleksandar and Cabrilo, Aleksandar and Kljajin, Milan",
year = "2021",
abstract = "Fatigue crack growth through different welded joint regions was investigated, in terms of welded joint geometry and fatigue crack position. In the first phase of investigation, numerical simulation of crack growth in a welded joint made of steel P460NL1 was performed using extended Finite Element Methods (xFEM). Numerical models employed Paris law, using experimentally determined coefficients for each welded joint zone. Weld geometry was varied by using different heat affected zone (HAZ) widths, i.e. fatigue crack lengths. The second stage involved similar numerical models with different material (Protac 500). Fatigue lives for regions in both models were then compared.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "International Journal of Fatigue",
title = "Welded joint geometry effect on fatigue crack growth resistance in different metallic materials",
volume = "150",
doi = "10.1016/j.ijfatigue.2021.106298"
}

Sedmak, A., Hemer, A., Sedmak, S., Milović, L., Grbović, A., Cabrilo, A.,& Kljajin, M.. (2021). Welded joint geometry effect on fatigue crack growth resistance in different metallic materials. in International Journal of Fatigue
Elsevier Sci Ltd, Oxford., 150.
https://doi.org/10.1016/j.ijfatigue.2021.106298

Sedmak A, Hemer A, Sedmak S, Milović L, Grbović A, Cabrilo A, Kljajin M. Welded joint geometry effect on fatigue crack growth resistance in different metallic materials. in International Journal of Fatigue. 2021;150.
doi:10.1016/j.ijfatigue.2021.106298 .

Sedmak, Aleksandar, Hemer, Abubkr, Sedmak, Simon, Milović, Ljubica, Grbović, Aleksandar, Cabrilo, Aleksandar, Kljajin, Milan, "Welded joint geometry effect on fatigue crack growth resistance in different metallic materials" in International Journal of Fatigue, 150 (2021),
https://doi.org/10.1016/j.ijfatigue.2021.106298 . .

TY  - CONF
AU  - Anđelić, Nina
AU  - Milošević-Mitić, Vesna
AU  - Petrović, Ana
AU  - Đurđević, Đorđe
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6127
AB  - An approach to the optimization of the thin-walled cantilever open section beams subjected 
to thе bending and to the constrained torsion, whose consequencesis are particularly evident in the 
case of thin-walled profiles, is considered. The problem is reduced to the determination of 
minimum mass i.e. minimum cross-sectional area of structural thin-walled channel-section and Z section beam elements for given loads, material and geometrical characteristics. The area of the 
cross-section is assumed to be the objective function. The stress constraints are introduced. A 
general case when bending moments about two centroidal axes and the bimoment are acting 
simultaneously is derived, and then some particular loading cases are considered. A method of 
solving the optimal relation of the parts of the considered cross-section is described. Applying the 
Lagrange multiplier method, the equations, whose solutions represent the optimal values of the 
ratios of the parts of the chosen cross-section, are derived. The obtained results are used for 
numerical calculation
C3  - Proceedings of the 8th International Congress of Serbian Society of Mechanics, Kragujevac, Serbia
T1  - One View on the Optimization of Thin-walled Cantilever Channel and Z-section Beams
EP  - 241
SP  - 240
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6127
ER  - 

@conference{
author = "Anđelić, Nina and Milošević-Mitić, Vesna and Petrović, Ana and Đurđević, Đorđe",
year = "2021",
abstract = "An approach to the optimization of the thin-walled cantilever open section beams subjected 
to thе bending and to the constrained torsion, whose consequencesis are particularly evident in the 
case of thin-walled profiles, is considered. The problem is reduced to the determination of 
minimum mass i.e. minimum cross-sectional area of structural thin-walled channel-section and Z section beam elements for given loads, material and geometrical characteristics. The area of the 
cross-section is assumed to be the objective function. The stress constraints are introduced. A 
general case when bending moments about two centroidal axes and the bimoment are acting 
simultaneously is derived, and then some particular loading cases are considered. A method of 
solving the optimal relation of the parts of the considered cross-section is described. Applying the 
Lagrange multiplier method, the equations, whose solutions represent the optimal values of the 
ratios of the parts of the chosen cross-section, are derived. The obtained results are used for 
numerical calculation",
journal = "Proceedings of the 8th International Congress of Serbian Society of Mechanics, Kragujevac, Serbia",
title = "One View on the Optimization of Thin-walled Cantilever Channel and Z-section Beams",
pages = "241-240",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6127"
}

Anđelić, N., Milošević-Mitić, V., Petrović, A.,& Đurđević, Đ.. (2021). One View on the Optimization of Thin-walled Cantilever Channel and Z-section Beams. in Proceedings of the 8th International Congress of Serbian Society of Mechanics, Kragujevac, Serbia, 240-241.
https://hdl.handle.net/21.15107/rcub_machinery_6127

Anđelić N, Milošević-Mitić V, Petrović A, Đurđević Đ. One View on the Optimization of Thin-walled Cantilever Channel and Z-section Beams. in Proceedings of the 8th International Congress of Serbian Society of Mechanics, Kragujevac, Serbia. 2021;:240-241.
https://hdl.handle.net/21.15107/rcub_machinery_6127 .

Anđelić, Nina, Milošević-Mitić, Vesna, Petrović, Ana, Đurđević, Đorđe, "One View on the Optimization of Thin-walled Cantilever Channel and Z-section Beams" in Proceedings of the 8th International Congress of Serbian Society of Mechanics, Kragujevac, Serbia (2021):240-241,
https://hdl.handle.net/21.15107/rcub_machinery_6127 .

TY  - CONF
AU  - Paunić, Milovan
AU  - Filijović, Marko
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6316
AB  - A solar or photovoltaic cell is a semiconductor device that converts the
Sun’s light energy into electricity, which occurs due to the photoelectric effect.
The world market is dominated by silicon solar cells. The solar panel is only able
to absorb the photons of a certain wavelength and this ability is directly impacted
by the type of material from which the solar panel is made. This limitation results
in certain shortcomings that are noticed during energy conversion and it is these
shortcomings that represent opportunities for the improvement and application
of quantum dots in solar systems.
This paper intends to review the theoretical explanation of the functioning
of silicon solar cells and to present the possibilities of quantum dots application
that arise from their unique properties. Due to their ability to absorb different
wavelengths, quantum dots are capable of absorbing more photons from the
solar spectrum, which theoretically increases their efficiency in relation to silicon
solar cells.
In the case of quantum dots application, transmission and reflection are
significantly reduced, so quantum dots can be used as a kind of coating for
silicon solar cells.
The application of new quantum-dot-based tools provides broad scientific
opportunities for the advancement and further development of nanotechnologies
PB  - University „Union Nikola Tesla”, Belgrade, Serbia
C3  - The First International Conference on Sustainable Environment and Technologies - Proceedings
T1  - THE PRINCIPLE OF OPERATION OF SOLAR CELLS AND THE POSSIBILITY OF INCREASING EFFICIENCY BY APPLYING QUANTUM DOTS
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6316
ER  - 

@conference{
author = "Paunić, Milovan and Filijović, Marko",
year = "2021",
abstract = "A solar or photovoltaic cell is a semiconductor device that converts the
Sun’s light energy into electricity, which occurs due to the photoelectric effect.
The world market is dominated by silicon solar cells. The solar panel is only able
to absorb the photons of a certain wavelength and this ability is directly impacted
by the type of material from which the solar panel is made. This limitation results
in certain shortcomings that are noticed during energy conversion and it is these
shortcomings that represent opportunities for the improvement and application
of quantum dots in solar systems.
This paper intends to review the theoretical explanation of the functioning
of silicon solar cells and to present the possibilities of quantum dots application
that arise from their unique properties. Due to their ability to absorb different
wavelengths, quantum dots are capable of absorbing more photons from the
solar spectrum, which theoretically increases their efficiency in relation to silicon
solar cells.
In the case of quantum dots application, transmission and reflection are
significantly reduced, so quantum dots can be used as a kind of coating for
silicon solar cells.
The application of new quantum-dot-based tools provides broad scientific
opportunities for the advancement and further development of nanotechnologies",
publisher = "University „Union Nikola Tesla”, Belgrade, Serbia",
journal = "The First International Conference on Sustainable Environment and Technologies - Proceedings",
title = "THE PRINCIPLE OF OPERATION OF SOLAR CELLS AND THE POSSIBILITY OF INCREASING EFFICIENCY BY APPLYING QUANTUM DOTS",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6316"
}

Paunić, M.,& Filijović, M.. (2021). THE PRINCIPLE OF OPERATION OF SOLAR CELLS AND THE POSSIBILITY OF INCREASING EFFICIENCY BY APPLYING QUANTUM DOTS. in The First International Conference on Sustainable Environment and Technologies - Proceedings
University „Union Nikola Tesla”, Belgrade, Serbia..
https://hdl.handle.net/21.15107/rcub_machinery_6316

Paunić M, Filijović M. THE PRINCIPLE OF OPERATION OF SOLAR CELLS AND THE POSSIBILITY OF INCREASING EFFICIENCY BY APPLYING QUANTUM DOTS. in The First International Conference on Sustainable Environment and Technologies - Proceedings. 2021;.
https://hdl.handle.net/21.15107/rcub_machinery_6316 .

Paunić, Milovan, Filijović, Marko, "THE PRINCIPLE OF OPERATION OF SOLAR CELLS AND THE POSSIBILITY OF INCREASING EFFICIENCY BY APPLYING QUANTUM DOTS" in The First International Conference on Sustainable Environment and Technologies - Proceedings (2021),
https://hdl.handle.net/21.15107/rcub_machinery_6316 .

TY  - CONF
AU  - Milovanović, Aleksa
AU  - Milošević, Miloš
AU  - Mladenović, Goran
AU  - Travica, Milan
AU  - Mitrović, Nenad
AU  - Kirin, Snežana
AU  - Trajković, Isaak
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7360
AB  - Modern home windows include new approaches in their design and new material utilization to achieve best
resistance to harsh weather conditions and to achieve best possible thermal insulation. Chosen internal
structure of window frame and selected material affect on structural life. Integrity assessment of home window
frames covers experimental and numerical approaches, including experimental DIC method (Digital Image
Correlation-DIC) and FEA (Finite Element Analysis) numerical method. The aim of this research is to find the
matching between both techniques and to use only numerical method in future to assess the structural life of
home window frames with different internal structures in the design and different materials. Experimental
testing is performed on the Universal tensile testing machine ‘’Shimadzu AGS-X’’ with 100kN load capacity,
which is sufficient for home window frame testing. DIC cameras are used for recording of the experimental
technique and the output are displacements and deformations on observed structure. FEA simulation accepts
the before experimental conditions, i.e. maximal load, material characteristics and geometry. Matching of
experimental results and attained FEA simulation will allow for easier Integrity assessment using only
numerical simulations for future tests. Therefore, with mentioned technique new internal structures of windows
and different materials can be simulated and the obtained results will show if the chosen home window frame
structure and material selection is sufficient enough for practical use.
PB  - Innovation Center of Faculty of Mechanical Engineering
C3  - International conference of experimental and numerical investigations and new technologies (2020 ; Zlatibor)
T1  - Experimental and numerical integrity assessment of home window profiles and frames
SP  - 10
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7360
ER  - 

@conference{
author = "Milovanović, Aleksa and Milošević, Miloš and Mladenović, Goran and Travica, Milan and Mitrović, Nenad and Kirin, Snežana and Trajković, Isaak",
year = "2020",
abstract = "Modern home windows include new approaches in their design and new material utilization to achieve best
resistance to harsh weather conditions and to achieve best possible thermal insulation. Chosen internal
structure of window frame and selected material affect on structural life. Integrity assessment of home window
frames covers experimental and numerical approaches, including experimental DIC method (Digital Image
Correlation-DIC) and FEA (Finite Element Analysis) numerical method. The aim of this research is to find the
matching between both techniques and to use only numerical method in future to assess the structural life of
home window frames with different internal structures in the design and different materials. Experimental
testing is performed on the Universal tensile testing machine ‘’Shimadzu AGS-X’’ with 100kN load capacity,
which is sufficient for home window frame testing. DIC cameras are used for recording of the experimental
technique and the output are displacements and deformations on observed structure. FEA simulation accepts
the before experimental conditions, i.e. maximal load, material characteristics and geometry. Matching of
experimental results and attained FEA simulation will allow for easier Integrity assessment using only
numerical simulations for future tests. Therefore, with mentioned technique new internal structures of windows
and different materials can be simulated and the obtained results will show if the chosen home window frame
structure and material selection is sufficient enough for practical use.",
publisher = "Innovation Center of Faculty of Mechanical Engineering",
journal = "International conference of experimental and numerical investigations and new technologies (2020 ; Zlatibor)",
title = "Experimental and numerical integrity assessment of home window profiles and frames",
pages = "10",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7360"
}

Milovanović, A., Milošević, M., Mladenović, G., Travica, M., Mitrović, N., Kirin, S.,& Trajković, I.. (2020). Experimental and numerical integrity assessment of home window profiles and frames. in International conference of experimental and numerical investigations and new technologies (2020 ; Zlatibor)
Innovation Center of Faculty of Mechanical Engineering., 10.
https://hdl.handle.net/21.15107/rcub_machinery_7360

Milovanović A, Milošević M, Mladenović G, Travica M, Mitrović N, Kirin S, Trajković I. Experimental and numerical integrity assessment of home window profiles and frames. in International conference of experimental and numerical investigations and new technologies (2020 ; Zlatibor). 2020;:10.
https://hdl.handle.net/21.15107/rcub_machinery_7360 .

Milovanović, Aleksa, Milošević, Miloš, Mladenović, Goran, Travica, Milan, Mitrović, Nenad, Kirin, Snežana, Trajković, Isaak, "Experimental and numerical integrity assessment of home window profiles and frames" in International conference of experimental and numerical investigations and new technologies (2020 ; Zlatibor) (2020):10,
https://hdl.handle.net/21.15107/rcub_machinery_7360 .

TY  - THES
AU  - Milovanović, Nikola
PY  - 2020
UR  - http://eteze.bg.ac.rs/application/showtheses?thesesId=8010
UR  - https://fedorabg.bg.ac.rs/fedora/get/o:23401/bdef:Content/download
UR  - http://vbs.rs/scripts/cobiss?command=DISPLAY&base=70036&RID=33297673
UR  - https://nardus.mpn.gov.rs/handle/123456789/18160
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/77
AB  - Integritet konstrukcija kao naučna i inženjerska disciplina kao deo mehanike loma obuhvata analizu stanja i dijagnostiku ponašanja i otkaza, procenu veka i revitalizaciju konstrukcija, kao što je poznato od ranije. Primenom metoda definisanih ovom naučnom disciplinom mogu se odrediti „slaba“ mesta u konstrukciji, pre nastanka prsline kao i u prisustvu prsline kod konstrukcija koje su izložene razlitičitim tipovima opterećenja. Procena integriteta rotacione opreme, kao što je vratilo turbine, predstavlja poseban izazov zbog prirode njegovog opterećenja. Kada se na u ceo problem doda i uticaj prsline problem postaje još složeniji i zahteva uključivanje više naučnih disciplina i alata, poput softverskih paketa kojima je moguće simulirati radne uslove opreme, tačnije, dinimačko opterećenje koje može izazvati zamor materijala. Tema ove doktorske disertacije je istraživanje ponašanja rotacione opreme, konkretno vratila turbine, Hidroelektrane „Đerdap II“ u prisustvu prslina sa ciljem određivanja integriteta i preostalog radnog veka vratila turbine. Opasnost u slučaju prisustvu prsline kod ovog tipa opreme je mogućnost pojave krtog loma koji je, po prirodi, nepredvidiv i često sa fatalnim posledicama. Posebna pažnja u ovoj studiji posvećena je mestima koja izazivaju koncentraciju napona. U rešavanju problema procene integriteta rotacione opreme vratila hidroelektrane korišćeni su softverski paketi Abaqus i MORFEO, odnosno principi proširene metode konačnih elemenata (eng. XFEM). Kao ulazni podaci u primeni XFEM metode primenom ovih paketa korišćeni si eksperimentalni rezultati primenom koncepta elasto-plastične mehanike loma kao i primena poznatog Parisovog zakona sa ciljem određivanja brzine rasta zamorne prsline. Dobijeni podaci eksperimentalnim ispitivanjima, konkretno vrednosti parametara C i m poznatog Parisovog zakona, poslužili su kao osnova za urađene numeričke simulacije rasta zamorne prsline u samom vratilu trubine primenom zakona linealno-elastične mehanike loma. Pored toga, u ovoj studiji urađena je naponska analiza vratila turbine kao i neposredno poređenje analitičkih i numeričkih rezultata. Osnovni cilj celokupne studije može se svesti na objašnjenje kompleksnog stanja i generalno ponašanje rotacione opreme, odnosno vratila turbine u prisustvu prslina nastalih zamornim opterećenjem i u prisustvu koncetratora napona. Može se istaći da je i akcenat ove studije utvrđivanje zavisnosti brzine rasta prsline od veličine prsline za određenu geometriju vratila na osnovu čije je moguće proceniti integritet i vek vratila, pored svih poznatih osobina materijala. Indirektno, razvijeni i predstavljeni numerički modeli u ovoj disertaciji, kao i eksperimentalne procedure koji imaju veliku primenljivost u oblasti procene integriteta generalno kod opreme ovog tipa takođe su imali za cilj davanje naučnom ivi inženjerskom doprinosu analize ove studije sa ciljem utvrđivanja integriteta i preostalog radnog veka opreme izložene zamarajućem opterećenju u prisustvu prsline.
AB  - As it is known, structural integrity as a scientific and engineering discipline as part of fracture mechanics includes structure analysis, its behavior and failure diagnostics, life assessment as well as structural revitalization. By applying the methods defined by this scientific discipline, it is possible to determine "weak" places in the structure, before crack occure and in the presence of a crack in structures that are exposed to a different types of loads. Assessing the integrity of rotary equipment, such as turbine shafts, is a particular challenge due to the nature of its load. Presence the crack makes the whole problem becoming even more complex and requires the inclusion of more scientific disciplines and tools, such as software packages that can simulate the working conditions of equipment, more precisely, dynamic load that can cause material fatigue of the structure. The topic of this doctoral dissertation is the research of the behavior of rotary equipment, specifically turbine shafts, Hydroelectric Power Plant "Đerdap II" in the presence of cracks with the aim of determining the integrity and remaining service life of turbine shafts. The danger in the presence of a crack with this type of equipment is the possibility of a brittle fracture which is, by its nature, unpredictable, and often with fatal consequences. Special attention in this study is dedicated to the places on the structure that cause stress concentration. The Abaqus and MORFEO software packages, i.e. the principles of the extended finite element method (eng. XFEM), were used to solve the problem of assessing the integrity of the rotary equipment of the hydroelectric shaft. As input data in application of XFEM method using aforementioned packages, experimental results obtained by using concept of elastic-plastic fracture mechanics i.e. application of the well-known Paris law with the aim of determining the fatigue crack growth rate are used. The data obtained by experimental tests, specifically the values of parameters C and m of the well-known Paris law, were the basis for numerical simulations of fatigue crack growth in the turbine shaft using the law of linear-elastic fracture mechanics. In addition, in this study, a stress analysis of the turbine shaft was performed, as well as a direct comparison of analytical and numerical results. The main goal of the entire study can be reduced to the explanation of the complex state and general behavior of the rotary equipment, i.e. the turbine shaft in the presence of cracks caused by fatigue load and in the presence of a stress concentrator. It can be pointed out that the main objective of this study is to determine the dependence of crack growth rate on crack size for a certain shaft geometry on the basis of which it is possible to estimate the integrity and life of the shaft, in addition to all known material properties. Indirectly, the developed and presented numerical models in this dissertation, as well as experimental procedures that have great applicability in integrity assessment of this type equipment,viii also provide scientific and engineering contributions of this study analysis, like determining integrity and remaining life of the equipment exposed to a fatigue load in the presence of a crack.
PB  - Univerzitet u Beogradu, Mašinski fakultet
T1  - Procena integriteta rotacione opreme primenom parametara mehanike loma
T1  - Estimation of rotary equipment integrity using fracture mechanics parameters
UR  - https://hdl.handle.net/21.15107/rcub_nardus_18160
ER  - 

@phdthesis{
author = "Milovanović, Nikola",
year = "2020",
abstract = "Integritet konstrukcija kao naučna i inženjerska disciplina kao deo mehanike loma obuhvata analizu stanja i dijagnostiku ponašanja i otkaza, procenu veka i revitalizaciju konstrukcija, kao što je poznato od ranije. Primenom metoda definisanih ovom naučnom disciplinom mogu se odrediti „slaba“ mesta u konstrukciji, pre nastanka prsline kao i u prisustvu prsline kod konstrukcija koje su izložene razlitičitim tipovima opterećenja. Procena integriteta rotacione opreme, kao što je vratilo turbine, predstavlja poseban izazov zbog prirode njegovog opterećenja. Kada se na u ceo problem doda i uticaj prsline problem postaje još složeniji i zahteva uključivanje više naučnih disciplina i alata, poput softverskih paketa kojima je moguće simulirati radne uslove opreme, tačnije, dinimačko opterećenje koje može izazvati zamor materijala. Tema ove doktorske disertacije je istraživanje ponašanja rotacione opreme, konkretno vratila turbine, Hidroelektrane „Đerdap II“ u prisustvu prslina sa ciljem određivanja integriteta i preostalog radnog veka vratila turbine. Opasnost u slučaju prisustvu prsline kod ovog tipa opreme je mogućnost pojave krtog loma koji je, po prirodi, nepredvidiv i često sa fatalnim posledicama. Posebna pažnja u ovoj studiji posvećena je mestima koja izazivaju koncentraciju napona. U rešavanju problema procene integriteta rotacione opreme vratila hidroelektrane korišćeni su softverski paketi Abaqus i MORFEO, odnosno principi proširene metode konačnih elemenata (eng. XFEM). Kao ulazni podaci u primeni XFEM metode primenom ovih paketa korišćeni si eksperimentalni rezultati primenom koncepta elasto-plastične mehanike loma kao i primena poznatog Parisovog zakona sa ciljem određivanja brzine rasta zamorne prsline. Dobijeni podaci eksperimentalnim ispitivanjima, konkretno vrednosti parametara C i m poznatog Parisovog zakona, poslužili su kao osnova za urađene numeričke simulacije rasta zamorne prsline u samom vratilu trubine primenom zakona linealno-elastične mehanike loma. Pored toga, u ovoj studiji urađena je naponska analiza vratila turbine kao i neposredno poređenje analitičkih i numeričkih rezultata. Osnovni cilj celokupne studije može se svesti na objašnjenje kompleksnog stanja i generalno ponašanje rotacione opreme, odnosno vratila turbine u prisustvu prslina nastalih zamornim opterećenjem i u prisustvu koncetratora napona. Može se istaći da je i akcenat ove studije utvrđivanje zavisnosti brzine rasta prsline od veličine prsline za određenu geometriju vratila na osnovu čije je moguće proceniti integritet i vek vratila, pored svih poznatih osobina materijala. Indirektno, razvijeni i predstavljeni numerički modeli u ovoj disertaciji, kao i eksperimentalne procedure koji imaju veliku primenljivost u oblasti procene integriteta generalno kod opreme ovog tipa takođe su imali za cilj davanje naučnom ivi inženjerskom doprinosu analize ove studije sa ciljem utvrđivanja integriteta i preostalog radnog veka opreme izložene zamarajućem opterećenju u prisustvu prsline., As it is known, structural integrity as a scientific and engineering discipline as part of fracture mechanics includes structure analysis, its behavior and failure diagnostics, life assessment as well as structural revitalization. By applying the methods defined by this scientific discipline, it is possible to determine "weak" places in the structure, before crack occure and in the presence of a crack in structures that are exposed to a different types of loads. Assessing the integrity of rotary equipment, such as turbine shafts, is a particular challenge due to the nature of its load. Presence the crack makes the whole problem becoming even more complex and requires the inclusion of more scientific disciplines and tools, such as software packages that can simulate the working conditions of equipment, more precisely, dynamic load that can cause material fatigue of the structure. The topic of this doctoral dissertation is the research of the behavior of rotary equipment, specifically turbine shafts, Hydroelectric Power Plant "Đerdap II" in the presence of cracks with the aim of determining the integrity and remaining service life of turbine shafts. The danger in the presence of a crack with this type of equipment is the possibility of a brittle fracture which is, by its nature, unpredictable, and often with fatal consequences. Special attention in this study is dedicated to the places on the structure that cause stress concentration. The Abaqus and MORFEO software packages, i.e. the principles of the extended finite element method (eng. XFEM), were used to solve the problem of assessing the integrity of the rotary equipment of the hydroelectric shaft. As input data in application of XFEM method using aforementioned packages, experimental results obtained by using concept of elastic-plastic fracture mechanics i.e. application of the well-known Paris law with the aim of determining the fatigue crack growth rate are used. The data obtained by experimental tests, specifically the values of parameters C and m of the well-known Paris law, were the basis for numerical simulations of fatigue crack growth in the turbine shaft using the law of linear-elastic fracture mechanics. In addition, in this study, a stress analysis of the turbine shaft was performed, as well as a direct comparison of analytical and numerical results. The main goal of the entire study can be reduced to the explanation of the complex state and general behavior of the rotary equipment, i.e. the turbine shaft in the presence of cracks caused by fatigue load and in the presence of a stress concentrator. It can be pointed out that the main objective of this study is to determine the dependence of crack growth rate on crack size for a certain shaft geometry on the basis of which it is possible to estimate the integrity and life of the shaft, in addition to all known material properties. Indirectly, the developed and presented numerical models in this dissertation, as well as experimental procedures that have great applicability in integrity assessment of this type equipment,viii also provide scientific and engineering contributions of this study analysis, like determining integrity and remaining life of the equipment exposed to a fatigue load in the presence of a crack.",
publisher = "Univerzitet u Beogradu, Mašinski fakultet",
title = "Procena integriteta rotacione opreme primenom parametara mehanike loma, Estimation of rotary equipment integrity using fracture mechanics parameters",
url = "https://hdl.handle.net/21.15107/rcub_nardus_18160"
}

Milovanović, N.. (2020). Procena integriteta rotacione opreme primenom parametara mehanike loma. 
Univerzitet u Beogradu, Mašinski fakultet..
https://hdl.handle.net/21.15107/rcub_nardus_18160

Milovanović N. Procena integriteta rotacione opreme primenom parametara mehanike loma. 2020;.
https://hdl.handle.net/21.15107/rcub_nardus_18160 .

Milovanović, Nikola, "Procena integriteta rotacione opreme primenom parametara mehanike loma" (2020),
https://hdl.handle.net/21.15107/rcub_nardus_18160 .

TY  - THES
AU  - Jeremić, Lazar
PY  - 2020
UR  - http://eteze.bg.ac.rs/application/showtheses?thesesId=7987
UR  - https://fedorabg.bg.ac.rs/fedora/get/o:23362/bdef:Content/download
UR  - http://vbs.rs/scripts/cobiss?command=DISPLAY&base=70036&RID=31697673
UR  - https://nardus.mpn.gov.rs/handle/123456789/18071
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/78
AB  - Predmet ove doktorske disertacije je istraživanje ponašanja zavarenih konstrukcija sa smanjenim stepenom sigurnosti prema krtom lomu i otpornost na prsline u cilju ocene njenog integriteta i veka. U tom slučaju posebna pažnja se posvećuje mestima koncentracije napona, jer se krti lomovi ovih konstrukcija po pravilu događaju upravo na takvim mestima. Radi detaljnog proučavanja nakstanka i rasta prsline, neophodna je primena principa mehanike loma, jer klasični pristup konstruisanju (projektovanju) preko faktora koncentracije napona i čvrstoće u tom slučaju nije dovoljan. Primenom parametra mehanike loma, kao što je faktor inteziteta napona, čiji opseg definiše brzinu rasta prline, a čija kritična veličina (žilavost loma) određuje kritičnu dužinu prsline. Time se obezbeđuje pouzdana procena integriteta konstrukcije (ako se dokaže da je faktor intenziteta napona manji od žilavosti loma), odnosno procena veka konstrukcije (primenom zakona mehanike loma na izračuvavanje krritičnih parametara za poznatu ili pretpostavljenu početnu dužinu prsline, njenu kritičnu vrednost, kao i izračunati opseg faktora intenzitata napona). Konzervativni pristup u svim koracima ove procedure obezbeđuje pouzdanu eksploataciju konstrukcije sa smanjenim stepenom sigurnosti.
AB  - The subject of this doctoral dissertation is the research of the behavior of welded structures with a reduced degree of safety on brittle fracture and crack resistance in order to assess its integrity and age. In this case, special attention is paid to the stress concentration points, since the fractures of these structures tend to occur exactly in such places. For the detailed study of the crack and growth of the crack, it is necessary to apply the principle of fracture mechanics, since the classical approach to design (design) through the factor of stress concentration and strength is not sufficient in that case. Using the fracture mechanics parameter, such as the voltage intensity factor, whose range defines the rate of crack growth, and whose critical size (fracture toughness) determines the critical crack length. This ensures a reliable assessment of the integrity of the structure (if it is proven that the stress intensity factor is less than the tensile strength of the fracture), or the assessment of the century of construction (by applying laws of fracture mechanics to calculate critical parameters for known or assumed initial crack length, its critical value, as well as calculate the range voltage intensities factor). A conservative approach in all steps of this procedure ensures reliable exploitation of a structure with a reduced degree of safety
PB  - Univerzitet u Beogradu, Mašinski fakultet
T1  - Procena integriteta zavarenih konstrukcija projektovanih sa smanjenim stepenom sigurnosti
T1  - Integrity assessment of welded structures designed with reduced safety
UR  - https://hdl.handle.net/21.15107/rcub_nardus_18071
ER  - 

@phdthesis{
author = "Jeremić, Lazar",
year = "2020",
abstract = "Predmet ove doktorske disertacije je istraživanje ponašanja zavarenih konstrukcija sa smanjenim stepenom sigurnosti prema krtom lomu i otpornost na prsline u cilju ocene njenog integriteta i veka. U tom slučaju posebna pažnja se posvećuje mestima koncentracije napona, jer se krti lomovi ovih konstrukcija po pravilu događaju upravo na takvim mestima. Radi detaljnog proučavanja nakstanka i rasta prsline, neophodna je primena principa mehanike loma, jer klasični pristup konstruisanju (projektovanju) preko faktora koncentracije napona i čvrstoće u tom slučaju nije dovoljan. Primenom parametra mehanike loma, kao što je faktor inteziteta napona, čiji opseg definiše brzinu rasta prline, a čija kritična veličina (žilavost loma) određuje kritičnu dužinu prsline. Time se obezbeđuje pouzdana procena integriteta konstrukcije (ako se dokaže da je faktor intenziteta napona manji od žilavosti loma), odnosno procena veka konstrukcije (primenom zakona mehanike loma na izračuvavanje krritičnih parametara za poznatu ili pretpostavljenu početnu dužinu prsline, njenu kritičnu vrednost, kao i izračunati opseg faktora intenzitata napona). Konzervativni pristup u svim koracima ove procedure obezbeđuje pouzdanu eksploataciju konstrukcije sa smanjenim stepenom sigurnosti., The subject of this doctoral dissertation is the research of the behavior of welded structures with a reduced degree of safety on brittle fracture and crack resistance in order to assess its integrity and age. In this case, special attention is paid to the stress concentration points, since the fractures of these structures tend to occur exactly in such places. For the detailed study of the crack and growth of the crack, it is necessary to apply the principle of fracture mechanics, since the classical approach to design (design) through the factor of stress concentration and strength is not sufficient in that case. Using the fracture mechanics parameter, such as the voltage intensity factor, whose range defines the rate of crack growth, and whose critical size (fracture toughness) determines the critical crack length. This ensures a reliable assessment of the integrity of the structure (if it is proven that the stress intensity factor is less than the tensile strength of the fracture), or the assessment of the century of construction (by applying laws of fracture mechanics to calculate critical parameters for known or assumed initial crack length, its critical value, as well as calculate the range voltage intensities factor). A conservative approach in all steps of this procedure ensures reliable exploitation of a structure with a reduced degree of safety",
publisher = "Univerzitet u Beogradu, Mašinski fakultet",
title = "Procena integriteta zavarenih konstrukcija projektovanih sa smanjenim stepenom sigurnosti, Integrity assessment of welded structures designed with reduced safety",
url = "https://hdl.handle.net/21.15107/rcub_nardus_18071"
}

Jeremić, L.. (2020). Procena integriteta zavarenih konstrukcija projektovanih sa smanjenim stepenom sigurnosti. 
Univerzitet u Beogradu, Mašinski fakultet..
https://hdl.handle.net/21.15107/rcub_nardus_18071

Jeremić L. Procena integriteta zavarenih konstrukcija projektovanih sa smanjenim stepenom sigurnosti. 2020;.
https://hdl.handle.net/21.15107/rcub_nardus_18071 .

Jeremić, Lazar, "Procena integriteta zavarenih konstrukcija projektovanih sa smanjenim stepenom sigurnosti" (2020),
https://hdl.handle.net/21.15107/rcub_nardus_18071 .

TY  - CONF
AU  - Golubović, Zorana
AU  - Milovanović, Aleksa
AU  - Trajković, Isaak
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7364
AB  - Development of 3D printing in medical and dental applications has advanced significantly in recent years. 3D
technologies are commercially available, i.e. 3D printing and 3D scanning, allowing dentists to easily scan and
record state of hard and soft tissues following 3D printing of dental models or supporting structures-like surgical
guides and aligners. Thereafter, dental technicians work with these 3D printed dental models of upper and
lower jaw, as they previously have been working with plaster models, and because of attainable high
dimensional accuracy of these dental models 3D printing technology found its way in dentistry and will improve
both in today’s application and will expand the range of possible applications in dentistry.
The aim of this paper is to present stereolithography (SLA) 3D printing technology of dental working models.
SLA technology is mainly applied in rapid prototyping, but due to exceptional dimensional accuracy it easily
found its application in dentistry, where accuracy is of utmost importance. SLA technology works in layer-bylayer
manner, using UV lasers to polymerize, i.e. solidify, liquid photopolymer resin placed in a vat. Only
accuracy issue of this technology occurs when using more layers to build a model, i.e. if an error appears at a
certain layer it will stack on succeeding layers and will create notable dimensional mismatch. Materials used
in this research are grey standard resin, dental model resin, long-term biocompatible clear resin and
biocompatible photopolymer resin. Created dental models are used for planning and making dental crowns
and bridges.
C3  - International conference of experimental and numerical investigations and new technologies (2020 ; Zlatibor)
T1  - Possibilities of application of 3D printing in contemporary dentistry
SP  - 69
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7364
ER  - 

@conference{
author = "Golubović, Zorana and Milovanović, Aleksa and Trajković, Isaak",
year = "2020",
abstract = "Development of 3D printing in medical and dental applications has advanced significantly in recent years. 3D
technologies are commercially available, i.e. 3D printing and 3D scanning, allowing dentists to easily scan and
record state of hard and soft tissues following 3D printing of dental models or supporting structures-like surgical
guides and aligners. Thereafter, dental technicians work with these 3D printed dental models of upper and
lower jaw, as they previously have been working with plaster models, and because of attainable high
dimensional accuracy of these dental models 3D printing technology found its way in dentistry and will improve
both in today’s application and will expand the range of possible applications in dentistry.
The aim of this paper is to present stereolithography (SLA) 3D printing technology of dental working models.
SLA technology is mainly applied in rapid prototyping, but due to exceptional dimensional accuracy it easily
found its application in dentistry, where accuracy is of utmost importance. SLA technology works in layer-bylayer
manner, using UV lasers to polymerize, i.e. solidify, liquid photopolymer resin placed in a vat. Only
accuracy issue of this technology occurs when using more layers to build a model, i.e. if an error appears at a
certain layer it will stack on succeeding layers and will create notable dimensional mismatch. Materials used
in this research are grey standard resin, dental model resin, long-term biocompatible clear resin and
biocompatible photopolymer resin. Created dental models are used for planning and making dental crowns
and bridges.",
journal = "International conference of experimental and numerical investigations and new technologies (2020 ; Zlatibor)",
title = "Possibilities of application of 3D printing in contemporary dentistry",
pages = "69",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7364"
}

Golubović, Z., Milovanović, A.,& Trajković, I.. (2020). Possibilities of application of 3D printing in contemporary dentistry. in International conference of experimental and numerical investigations and new technologies (2020 ; Zlatibor), 69.
https://hdl.handle.net/21.15107/rcub_machinery_7364

Golubović Z, Milovanović A, Trajković I. Possibilities of application of 3D printing in contemporary dentistry. in International conference of experimental and numerical investigations and new technologies (2020 ; Zlatibor). 2020;:69.
https://hdl.handle.net/21.15107/rcub_machinery_7364 .

Golubović, Zorana, Milovanović, Aleksa, Trajković, Isaak, "Possibilities of application of 3D printing in contemporary dentistry" in International conference of experimental and numerical investigations and new technologies (2020 ; Zlatibor) (2020):69,
https://hdl.handle.net/21.15107/rcub_machinery_7364 .

TY  - JOUR
AU  - Petronić, Sanja
AU  - Čolić, Katarina
AU  - Đorđević, Branislav R.
AU  - Milovanović, D.
AU  - Burzić, Meri
AU  - Vučetić, Filip
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3352
AB  - Owing to their good mechanical properties, titanium based alloys are used for machine parts and devices that operate in demanding regimes and environmental conditions. Laser shock peening (LSP) is an innovative technique for improvement of the surface and mechanical characteristics of the material. In this paper, LSP is employed for additional improvement of already good characteristics of Ti- alloy. Laser shock peening is performed on alloy surface, with and without protective and transparent layer and obtained microstructure, surface characteristics and mechanical properties are compared. LSP improved the surface topology and microhardness of material, producing overall better results when the Ti-alloy surface was coated by transparent and protective layer.
PB  - Elsevier Sci Ltd, Oxford
T2  - Optics and Lasers in Engineering
T1  - Effect of laser shock peening with and without protective coating on the microstructure and mechanical properties of Ti-alloy
VL  - 129
DO  - 10.1016/j.optlaseng.2020.106052
ER  - 

@article{
author = "Petronić, Sanja and Čolić, Katarina and Đorđević, Branislav R. and Milovanović, D. and Burzić, Meri and Vučetić, Filip",
year = "2020",
abstract = "Owing to their good mechanical properties, titanium based alloys are used for machine parts and devices that operate in demanding regimes and environmental conditions. Laser shock peening (LSP) is an innovative technique for improvement of the surface and mechanical characteristics of the material. In this paper, LSP is employed for additional improvement of already good characteristics of Ti- alloy. Laser shock peening is performed on alloy surface, with and without protective and transparent layer and obtained microstructure, surface characteristics and mechanical properties are compared. LSP improved the surface topology and microhardness of material, producing overall better results when the Ti-alloy surface was coated by transparent and protective layer.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Optics and Lasers in Engineering",
title = "Effect of laser shock peening with and without protective coating on the microstructure and mechanical properties of Ti-alloy",
volume = "129",
doi = "10.1016/j.optlaseng.2020.106052"
}

Petronić, S., Čolić, K., Đorđević, B. R., Milovanović, D., Burzić, M.,& Vučetić, F.. (2020). Effect of laser shock peening with and without protective coating on the microstructure and mechanical properties of Ti-alloy. in Optics and Lasers in Engineering
Elsevier Sci Ltd, Oxford., 129.
https://doi.org/10.1016/j.optlaseng.2020.106052

Petronić S, Čolić K, Đorđević BR, Milovanović D, Burzić M, Vučetić F. Effect of laser shock peening with and without protective coating on the microstructure and mechanical properties of Ti-alloy. in Optics and Lasers in Engineering. 2020;129.
doi:10.1016/j.optlaseng.2020.106052 .

Petronić, Sanja, Čolić, Katarina, Đorđević, Branislav R., Milovanović, D., Burzić, Meri, Vučetić, Filip, "Effect of laser shock peening with and without protective coating on the microstructure and mechanical properties of Ti-alloy" in Optics and Lasers in Engineering, 129 (2020),
https://doi.org/10.1016/j.optlaseng.2020.106052 . .

TY  - JOUR
AU  - Vučetić, Filip
AU  - Čolić, Katarina
AU  - Grbović, Aleksandar
AU  - Petrović, Ana
AU  - Sedmak, Aleksandar
AU  - Kozak, Dražan
AU  - Sedmak, Simon
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3364
AB  - Biomaterials intended for orthopaedic plates manufacturing have much higher mechanical properties relative to the bone itself and still there are many cases where those plates fracture in service, with fatigue as the main failure mode. This causes problem with the healing process and requires that the patient undergoes another surgery. Experience and knowledge of the orthopaedic surgeon is one of the most important factors contributing to the frequency of fatigue failures. If incorrectly implanted, plates will be subjected to overloading from the start, which is convenient for crack initiation. One of the most commonly used biocompatible materials for internal bone fixation is alpha + beta titanium alloy Ti-6Al-4V. Focus of this study was to simulate the behaviour of titanium alloy orthopaedic plates in the presence of cracks under four-point bending. The extended finite element method (XFEM) in ANSYS was employed for this purpose. Loads correspond to the ones occurring in human tibia during gait cycle for different body weights. Experimental investigation of tensile and fracture mechanics parameters of Ti-6Al-4V alloy was conducted on tensile testing machine and fractomate. Numerical simulation established the optimal geometry from remaining life point of view, indicating large differences between different geometries. Results also have shown that the remaining life of orthopaedic plates is strongly dependant on patients body weight (load) and that the relative differences in remaining life between compared plate geometries stay the same under different loads. Influence of corrosive environment of the human body was not taken into consideration.
PB  - Univ Osijek, Tech Fac, Slavonski Brod
T2  - Tehnički vjesnik
T1  - Numerical Simulation of Fatigue Crack Growth in Titanium Alloy Orthopaedic Plates
EP  - 1922
IS  - 6
SP  - 1917
VL  - 27
DO  - 10.17559/TV-20200617192027
ER  - 

@article{
author = "Vučetić, Filip and Čolić, Katarina and Grbović, Aleksandar and Petrović, Ana and Sedmak, Aleksandar and Kozak, Dražan and Sedmak, Simon",
year = "2020",
abstract = "Biomaterials intended for orthopaedic plates manufacturing have much higher mechanical properties relative to the bone itself and still there are many cases where those plates fracture in service, with fatigue as the main failure mode. This causes problem with the healing process and requires that the patient undergoes another surgery. Experience and knowledge of the orthopaedic surgeon is one of the most important factors contributing to the frequency of fatigue failures. If incorrectly implanted, plates will be subjected to overloading from the start, which is convenient for crack initiation. One of the most commonly used biocompatible materials for internal bone fixation is alpha + beta titanium alloy Ti-6Al-4V. Focus of this study was to simulate the behaviour of titanium alloy orthopaedic plates in the presence of cracks under four-point bending. The extended finite element method (XFEM) in ANSYS was employed for this purpose. Loads correspond to the ones occurring in human tibia during gait cycle for different body weights. Experimental investigation of tensile and fracture mechanics parameters of Ti-6Al-4V alloy was conducted on tensile testing machine and fractomate. Numerical simulation established the optimal geometry from remaining life point of view, indicating large differences between different geometries. Results also have shown that the remaining life of orthopaedic plates is strongly dependant on patients body weight (load) and that the relative differences in remaining life between compared plate geometries stay the same under different loads. Influence of corrosive environment of the human body was not taken into consideration.",
publisher = "Univ Osijek, Tech Fac, Slavonski Brod",
journal = "Tehnički vjesnik",
title = "Numerical Simulation of Fatigue Crack Growth in Titanium Alloy Orthopaedic Plates",
pages = "1922-1917",
number = "6",
volume = "27",
doi = "10.17559/TV-20200617192027"
}

Vučetić, F., Čolić, K., Grbović, A., Petrović, A., Sedmak, A., Kozak, D.,& Sedmak, S.. (2020). Numerical Simulation of Fatigue Crack Growth in Titanium Alloy Orthopaedic Plates. in Tehnički vjesnik
Univ Osijek, Tech Fac, Slavonski Brod., 27(6), 1917-1922.
https://doi.org/10.17559/TV-20200617192027

Vučetić F, Čolić K, Grbović A, Petrović A, Sedmak A, Kozak D, Sedmak S. Numerical Simulation of Fatigue Crack Growth in Titanium Alloy Orthopaedic Plates. in Tehnički vjesnik. 2020;27(6):1917-1922.
doi:10.17559/TV-20200617192027 .

Vučetić, Filip, Čolić, Katarina, Grbović, Aleksandar, Petrović, Ana, Sedmak, Aleksandar, Kozak, Dražan, Sedmak, Simon, "Numerical Simulation of Fatigue Crack Growth in Titanium Alloy Orthopaedic Plates" in Tehnički vjesnik, 27, no. 6 (2020):1917-1922,
https://doi.org/10.17559/TV-20200617192027 . .

TY  - CONF
AU  - Vučetić, Filip
AU  - Čolić, Katarina
AU  - Grbović, Aleksandar
AU  - Radaković, Zoran
AU  - Sedmak, Simon
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3345
AB  - The extended finite element method (xFEM) was used to analyse fatigue crack growth in orthopaedic locking compression plates (LCP), made of Titanium alloy, Ti-6Al-4V, loaded in four-point bending. The optimal geometry was defined previously in respect to the remaining life of LCP used for patients with different body weights (BW - 60, 90 and 120 Kg). The plate with optimal geometry is analysed in more details here to assess the effect of BW and get better insight into fatigue crack growth path.
PB  - Elsevier, Amsterdam
C3  - Procedia Structural Integrity - 1st Virtual European Conference on Fracture - Vecf1
T1  - Extended FEM analysis of fatigue crack growth in Ti-6Al-4V orthopaedic plates
EP  - 560
SP  - 555
VL  - 28
DO  - 10.1016/j.prostr.2020.10.065
ER  - 

@conference{
author = "Vučetić, Filip and Čolić, Katarina and Grbović, Aleksandar and Radaković, Zoran and Sedmak, Simon",
year = "2020",
abstract = "The extended finite element method (xFEM) was used to analyse fatigue crack growth in orthopaedic locking compression plates (LCP), made of Titanium alloy, Ti-6Al-4V, loaded in four-point bending. The optimal geometry was defined previously in respect to the remaining life of LCP used for patients with different body weights (BW - 60, 90 and 120 Kg). The plate with optimal geometry is analysed in more details here to assess the effect of BW and get better insight into fatigue crack growth path.",
publisher = "Elsevier, Amsterdam",
journal = "Procedia Structural Integrity - 1st Virtual European Conference on Fracture - Vecf1",
title = "Extended FEM analysis of fatigue crack growth in Ti-6Al-4V orthopaedic plates",
pages = "560-555",
volume = "28",
doi = "10.1016/j.prostr.2020.10.065"
}

Vučetić, F., Čolić, K., Grbović, A., Radaković, Z.,& Sedmak, S.. (2020). Extended FEM analysis of fatigue crack growth in Ti-6Al-4V orthopaedic plates. in Procedia Structural Integrity - 1st Virtual European Conference on Fracture - Vecf1
Elsevier, Amsterdam., 28, 555-560.
https://doi.org/10.1016/j.prostr.2020.10.065

Vučetić F, Čolić K, Grbović A, Radaković Z, Sedmak S. Extended FEM analysis of fatigue crack growth in Ti-6Al-4V orthopaedic plates. in Procedia Structural Integrity - 1st Virtual European Conference on Fracture - Vecf1. 2020;28:555-560.
doi:10.1016/j.prostr.2020.10.065 .

Vučetić, Filip, Čolić, Katarina, Grbović, Aleksandar, Radaković, Zoran, Sedmak, Simon, "Extended FEM analysis of fatigue crack growth in Ti-6Al-4V orthopaedic plates" in Procedia Structural Integrity - 1st Virtual European Conference on Fracture - Vecf1, 28 (2020):555-560,
https://doi.org/10.1016/j.prostr.2020.10.065 . .

TY  - CONF
AU  - Petrović, Ana
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6011
AB  - There are numerous examples of failure of steel structures. There are various causes,
such as error in design, error in production, error in exploitation or unexpected loads.
When failure occurs, standard series of operations should be performed. Solving the
problem most often requires numerical and experimental analysis that is applied
iteratively. Inevitable is performing numerical calculation of the structure, using wellknown FEM analysis. In principle, if stress concentrations coincide with locations of
cracks, this indicates a bad design solution and proposal for redesign of the structure
should be given. However, stress is not the only indicator of defect in design. It is
necessary to know free frequencies of the structure, and distribution of potential and
kinetic energy in the main modes of oscillation. Reanalysis method and dynamic
modification are procedures based on different relations between potential and kinetic
energy, and gives recommendations for redesign. The main objective of a dynamic
modification of the structure is to increase the first frequency of oscillation, and that the
gap between adjacent frequencies is as big as possible, but this method can be used to
reduce the stress concentration as well. Several examples of everyday engineering
practice will show the importance of reanalysis method, and that it can be applied to all
types of structures, from very simple to complex. Considering experimental approach,
possibilities of performing experiments on real constructions are often limited,
especially in case of large constructions. One of the solutions is to create a sub-scaled
model in order to anticipate the behavior of the real construction, regarding the behavior
of the model, with sufficient accuracy. So, the idea is making a sub-scaled model of the
construction itself, which will provide the possibility of numerical-experimental
"learning" about the strength and rigidity of this construction. Advantages of model
testing will be shown by example of the bucket wheel excavator substructures. Model
testing includes: (1) creating sub-scaled model (physical and numerical), (2) assessment
of load applied to model using recommendations given by similarity method, (3)
performing (static and dynamic) numerical calculations of a real construction and its
sub-scaled model, and formulating of coefficients connecting these two models, (4)
performing experiments of a model in order to verify all the numerical models. Also,
model testing allows testing in a laboratory "clean" environment, which also allows the
application of sensitive test equipment, such as system for non-contact stress and strain
measurement based on Digital Image Correlation (Aramis system).
C3  - Seminar Mechanics of machines and mechanisms- Models and Mathematical Methods, Mathematical Institute of SASA
T1  - Methods for numerical and experimental diagnostics of complex structures’ strength with special reference to model analysis
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6011
ER  - 

@conference{
author = "Petrović, Ana",
year = "2020",
abstract = "There are numerous examples of failure of steel structures. There are various causes,
such as error in design, error in production, error in exploitation or unexpected loads.
When failure occurs, standard series of operations should be performed. Solving the
problem most often requires numerical and experimental analysis that is applied
iteratively. Inevitable is performing numerical calculation of the structure, using wellknown FEM analysis. In principle, if stress concentrations coincide with locations of
cracks, this indicates a bad design solution and proposal for redesign of the structure
should be given. However, stress is not the only indicator of defect in design. It is
necessary to know free frequencies of the structure, and distribution of potential and
kinetic energy in the main modes of oscillation. Reanalysis method and dynamic
modification are procedures based on different relations between potential and kinetic
energy, and gives recommendations for redesign. The main objective of a dynamic
modification of the structure is to increase the first frequency of oscillation, and that the
gap between adjacent frequencies is as big as possible, but this method can be used to
reduce the stress concentration as well. Several examples of everyday engineering
practice will show the importance of reanalysis method, and that it can be applied to all
types of structures, from very simple to complex. Considering experimental approach,
possibilities of performing experiments on real constructions are often limited,
especially in case of large constructions. One of the solutions is to create a sub-scaled
model in order to anticipate the behavior of the real construction, regarding the behavior
of the model, with sufficient accuracy. So, the idea is making a sub-scaled model of the
construction itself, which will provide the possibility of numerical-experimental
"learning" about the strength and rigidity of this construction. Advantages of model
testing will be shown by example of the bucket wheel excavator substructures. Model
testing includes: (1) creating sub-scaled model (physical and numerical), (2) assessment
of load applied to model using recommendations given by similarity method, (3)
performing (static and dynamic) numerical calculations of a real construction and its
sub-scaled model, and formulating of coefficients connecting these two models, (4)
performing experiments of a model in order to verify all the numerical models. Also,
model testing allows testing in a laboratory "clean" environment, which also allows the
application of sensitive test equipment, such as system for non-contact stress and strain
measurement based on Digital Image Correlation (Aramis system).",
journal = "Seminar Mechanics of machines and mechanisms- Models and Mathematical Methods, Mathematical Institute of SASA",
title = "Methods for numerical and experimental diagnostics of complex structures’ strength with special reference to model analysis",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6011"
}

Petrović, A.. (2020). Methods for numerical and experimental diagnostics of complex structures’ strength with special reference to model analysis. in Seminar Mechanics of machines and mechanisms- Models and Mathematical Methods, Mathematical Institute of SASA.
https://hdl.handle.net/21.15107/rcub_machinery_6011

Petrović A. Methods for numerical and experimental diagnostics of complex structures’ strength with special reference to model analysis. in Seminar Mechanics of machines and mechanisms- Models and Mathematical Methods, Mathematical Institute of SASA. 2020;.
https://hdl.handle.net/21.15107/rcub_machinery_6011 .

Petrović, Ana, "Methods for numerical and experimental diagnostics of complex structures’ strength with special reference to model analysis" in Seminar Mechanics of machines and mechanisms- Models and Mathematical Methods, Mathematical Institute of SASA (2020),
https://hdl.handle.net/21.15107/rcub_machinery_6011 .

TY  - CONF
AU  - Golubović, Zorana
AU  - Milovanović, Aleksa
AU  - Trajković, Isaak
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6303
AB  - Development of 3D printing in medical and dental applications has advanced significantly in recent years. 3D technologies are commercially available, i.e. 3D printing and 3D scanning, allowing dentists to easily scan and record state of hard and soft tissues following 3D printing of dental models or supporting structures-like surgical guides and aligners. Thereafter, dental technicians work with these 3D printed dental models of upper and lower jaw, as they previously have been working with plaster models, and because of attainable high dimensional accuracy of these dental models 3D printing technology found its way in dentistry and will improve both in today’s application and will expand the range of possible applications in dentistry. The aim of this paper is to present stereolithography (SLA) 3D printing technology of dental working models. SLA technology is mainly applied in rapid prototyping, but due to exceptional dimensional accuracy it easily found its application in dentistry, where accuracy is of utmost importance. SLA technology works in layer-by-layer manner, using UV lasers to polymerize, i.e. solidify, liquid photopolymer resin placed in a vat. Only accuracy issue of this technology occurs when using more layers to build a model, i.e. if an error appears at a certain layer it will stack on succeeding layers and will create notable dimensional mismatch. Materials used in this research are grey standard resin, dental model resin, long-term biocompatible clear resin and biocompatible photopolymer resin. Created dental models are used for planning and making dental crowns and bridges.
PB  - University of Belgrade, Faculty of Mechanical Engineering
C3  - International Conference of Experimental and Numerical Investigations and New Technologies "CNN TECH 2021" - Book of Abstracts
T1  - Possibilities of Application of 3D Printing in Contemporary Dentistry
EP  - 69
SP  - 69
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6303
ER  - 

@conference{
author = "Golubović, Zorana and Milovanović, Aleksa and Trajković, Isaak",
year = "2020",
abstract = "Development of 3D printing in medical and dental applications has advanced significantly in recent years. 3D technologies are commercially available, i.e. 3D printing and 3D scanning, allowing dentists to easily scan and record state of hard and soft tissues following 3D printing of dental models or supporting structures-like surgical guides and aligners. Thereafter, dental technicians work with these 3D printed dental models of upper and lower jaw, as they previously have been working with plaster models, and because of attainable high dimensional accuracy of these dental models 3D printing technology found its way in dentistry and will improve both in today’s application and will expand the range of possible applications in dentistry. The aim of this paper is to present stereolithography (SLA) 3D printing technology of dental working models. SLA technology is mainly applied in rapid prototyping, but due to exceptional dimensional accuracy it easily found its application in dentistry, where accuracy is of utmost importance. SLA technology works in layer-by-layer manner, using UV lasers to polymerize, i.e. solidify, liquid photopolymer resin placed in a vat. Only accuracy issue of this technology occurs when using more layers to build a model, i.e. if an error appears at a certain layer it will stack on succeeding layers and will create notable dimensional mismatch. Materials used in this research are grey standard resin, dental model resin, long-term biocompatible clear resin and biocompatible photopolymer resin. Created dental models are used for planning and making dental crowns and bridges.",
publisher = "University of Belgrade, Faculty of Mechanical Engineering",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies "CNN TECH 2021" - Book of Abstracts",
title = "Possibilities of Application of 3D Printing in Contemporary Dentistry",
pages = "69-69",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6303"
}

Golubović, Z., Milovanović, A.,& Trajković, I.. (2020). Possibilities of Application of 3D Printing in Contemporary Dentistry. in International Conference of Experimental and Numerical Investigations and New Technologies "CNN TECH 2021" - Book of Abstracts
University of Belgrade, Faculty of Mechanical Engineering., 69-69.
https://hdl.handle.net/21.15107/rcub_machinery_6303

Golubović Z, Milovanović A, Trajković I. Possibilities of Application of 3D Printing in Contemporary Dentistry. in International Conference of Experimental and Numerical Investigations and New Technologies "CNN TECH 2021" - Book of Abstracts. 2020;:69-69.
https://hdl.handle.net/21.15107/rcub_machinery_6303 .

Golubović, Zorana, Milovanović, Aleksa, Trajković, Isaak, "Possibilities of Application of 3D Printing in Contemporary Dentistry" in International Conference of Experimental and Numerical Investigations and New Technologies "CNN TECH 2021" - Book of Abstracts (2020):69-69,
https://hdl.handle.net/21.15107/rcub_machinery_6303 .

TY  - JOUR
AU  - Flajs, Željko
AU  - Veg, Emil
AU  - Gubeljak, Nenad
AU  - Šiniković, Goran
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3396
AB  - Behavior of structures under various load types is determined by their deformation characteristics, global deformation characteristics - deflections and rotations, and local deformation characteristics - strains / stresses in structure base material. If we know global and local deformation characteristics of a structure, then it is possible to determine the structure behavior under acting loads, on the whole structure or at some part of that structure. The main objective of this research is to verify calculation algorithm for obtaining vertical displacements - the deflection of the structure, based on the known strain values in the structure base material, under acting load. The verification of the calculation algorithm is performed by comparing the numerical and experimental results.
PB  - Univ Osijek, Tech Fac, Slavonski Brod
T2  - Tehnički vjesnik
T1  - Deflection Calculation for Beam-type Structures from Measured Strain Data
EP  - 670
IS  - 2
SP  - 665
VL  - 27
DO  - 10.17559/TV-20200123124502
ER  - 

@article{
author = "Flajs, Željko and Veg, Emil and Gubeljak, Nenad and Šiniković, Goran",
year = "2020",
abstract = "Behavior of structures under various load types is determined by their deformation characteristics, global deformation characteristics - deflections and rotations, and local deformation characteristics - strains / stresses in structure base material. If we know global and local deformation characteristics of a structure, then it is possible to determine the structure behavior under acting loads, on the whole structure or at some part of that structure. The main objective of this research is to verify calculation algorithm for obtaining vertical displacements - the deflection of the structure, based on the known strain values in the structure base material, under acting load. The verification of the calculation algorithm is performed by comparing the numerical and experimental results.",
publisher = "Univ Osijek, Tech Fac, Slavonski Brod",
journal = "Tehnički vjesnik",
title = "Deflection Calculation for Beam-type Structures from Measured Strain Data",
pages = "670-665",
number = "2",
volume = "27",
doi = "10.17559/TV-20200123124502"
}

Flajs, Ž., Veg, E., Gubeljak, N.,& Šiniković, G.. (2020). Deflection Calculation for Beam-type Structures from Measured Strain Data. in Tehnički vjesnik
Univ Osijek, Tech Fac, Slavonski Brod., 27(2), 665-670.
https://doi.org/10.17559/TV-20200123124502

Flajs Ž, Veg E, Gubeljak N, Šiniković G. Deflection Calculation for Beam-type Structures from Measured Strain Data. in Tehnički vjesnik. 2020;27(2):665-670.
doi:10.17559/TV-20200123124502 .

Flajs, Željko, Veg, Emil, Gubeljak, Nenad, Šiniković, Goran, "Deflection Calculation for Beam-type Structures from Measured Strain Data" in Tehnički vjesnik, 27, no. 2 (2020):665-670,
https://doi.org/10.17559/TV-20200123124502 . .

TY  - JOUR
AU  - Hemer, Abubkr M.
AU  - Aranđelović, Mihajlo
AU  - Milović, Ljubica
AU  - Kljajin, Milan
AU  - Lozanović Šajić, Jasmina
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3299
AB  - This research will show the analytical way of determining the remaining life of a welded joint with a fatigue crack initiated in its heat affected zone. The calculation will be divided into two stages, since the fatigue crack propagated through the heat affected zone, and then through the parent material. The analysis will be related to specimens with different fatigue properties taken into account for both regions. These calculations included a number of models, since different crack lengths were used for the heat affected zone and the parent material. There were three pairs of different HAZ vs PM fatigue crack lengths, always with the assumption that the total crack length is 5 mm, due to measuring range of the used measuring foils. The aim of this analysis was to apply method typically used in fracture mechanics in order to determine the number of cycles in a welded joint with an initiated fatigue crack, depending on a number of parameters. Obtained results were then compared to the results from the numerical analysis for the same cases. While the total number of cycles was mostly unaffected by these changes, some noticeable differences were observed between individual welded joint regions in question, the heat affected zone and the parent material.
PB  - Univ Osijek, Tech Fac, Slavonski Brod
T2  - Tehnički vjesnik
T1  - Analytical vs Numerical Calculation of Fatigue Life for Different Welded Joint Regions
EP  - 1937
IS  - 6
SP  - 1931
VL  - 27
DO  - 10.17559/TV-20200921152557
ER  - 

@article{
author = "Hemer, Abubkr M. and Aranđelović, Mihajlo and Milović, Ljubica and Kljajin, Milan and Lozanović Šajić, Jasmina",
year = "2020",
abstract = "This research will show the analytical way of determining the remaining life of a welded joint with a fatigue crack initiated in its heat affected zone. The calculation will be divided into two stages, since the fatigue crack propagated through the heat affected zone, and then through the parent material. The analysis will be related to specimens with different fatigue properties taken into account for both regions. These calculations included a number of models, since different crack lengths were used for the heat affected zone and the parent material. There were three pairs of different HAZ vs PM fatigue crack lengths, always with the assumption that the total crack length is 5 mm, due to measuring range of the used measuring foils. The aim of this analysis was to apply method typically used in fracture mechanics in order to determine the number of cycles in a welded joint with an initiated fatigue crack, depending on a number of parameters. Obtained results were then compared to the results from the numerical analysis for the same cases. While the total number of cycles was mostly unaffected by these changes, some noticeable differences were observed between individual welded joint regions in question, the heat affected zone and the parent material.",
publisher = "Univ Osijek, Tech Fac, Slavonski Brod",
journal = "Tehnički vjesnik",
title = "Analytical vs Numerical Calculation of Fatigue Life for Different Welded Joint Regions",
pages = "1937-1931",
number = "6",
volume = "27",
doi = "10.17559/TV-20200921152557"
}

Hemer, A. M., Aranđelović, M., Milović, L., Kljajin, M.,& Lozanović Šajić, J.. (2020). Analytical vs Numerical Calculation of Fatigue Life for Different Welded Joint Regions. in Tehnički vjesnik
Univ Osijek, Tech Fac, Slavonski Brod., 27(6), 1931-1937.
https://doi.org/10.17559/TV-20200921152557

Hemer AM, Aranđelović M, Milović L, Kljajin M, Lozanović Šajić J. Analytical vs Numerical Calculation of Fatigue Life for Different Welded Joint Regions. in Tehnički vjesnik. 2020;27(6):1931-1937.
doi:10.17559/TV-20200921152557 .

Hemer, Abubkr M., Aranđelović, Mihajlo, Milović, Ljubica, Kljajin, Milan, Lozanović Šajić, Jasmina, "Analytical vs Numerical Calculation of Fatigue Life for Different Welded Joint Regions" in Tehnički vjesnik, 27, no. 6 (2020):1931-1937,
https://doi.org/10.17559/TV-20200921152557 . .

TY  - CONF
AU  - Hemer, Abubkr M.
AU  - Sedmak, Simon
AU  - Milović, Ljubica
AU  - Grbović, Aleksandar
AU  - Sedmak, Aleksandar
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3338
AB  - Fatigue behaviour of welded joints is investigated, in terms of welded joint geometry and the fatigue crack position. It is based on previous work which involved numerical simulation of fatigue crack growth in a welded joint made of micro-alloyed, low-carbon pressure vessel steel P460NL1, with the main focus on fatigue crack growth rate through different welded joint regions. The goal here was to change the size of the heat affected zone, as the region in which the fatigue crack initiated, and to compare the results obtained for new crack length values with the original ones, obtained by creating numerical models based on experimental data. A number of models were created, some of which simulated the case with a bigger heat affected zone (and, consequently, a smaller crack length in the weld metal), and other which simulated the case with a smaller heat affected zone. Due to the micro-structural differences between these two welded joint regions, noticeable differences appeared in the numbers of cycles obtained for each zone with varying fatigue crack lengths, as well as in the total number of cycles for both zones through which the crack propagated.
PB  - Elsevier, Amsterdam
C3  - Procedia Structural Integrity - 1st Virtual European Conference on Fracture - Vecf1
T1  - FEM simulation of welded joint geometry influence on fatigue crack growth resistance
EP  - 1832
SP  - 1827
VL  - 28
DO  - 10.1016/j.prostr.2020.11.005
ER  - 

@conference{
author = "Hemer, Abubkr M. and Sedmak, Simon and Milović, Ljubica and Grbović, Aleksandar and Sedmak, Aleksandar",
year = "2020",
abstract = "Fatigue behaviour of welded joints is investigated, in terms of welded joint geometry and the fatigue crack position. It is based on previous work which involved numerical simulation of fatigue crack growth in a welded joint made of micro-alloyed, low-carbon pressure vessel steel P460NL1, with the main focus on fatigue crack growth rate through different welded joint regions. The goal here was to change the size of the heat affected zone, as the region in which the fatigue crack initiated, and to compare the results obtained for new crack length values with the original ones, obtained by creating numerical models based on experimental data. A number of models were created, some of which simulated the case with a bigger heat affected zone (and, consequently, a smaller crack length in the weld metal), and other which simulated the case with a smaller heat affected zone. Due to the micro-structural differences between these two welded joint regions, noticeable differences appeared in the numbers of cycles obtained for each zone with varying fatigue crack lengths, as well as in the total number of cycles for both zones through which the crack propagated.",
publisher = "Elsevier, Amsterdam",
journal = "Procedia Structural Integrity - 1st Virtual European Conference on Fracture - Vecf1",
title = "FEM simulation of welded joint geometry influence on fatigue crack growth resistance",
pages = "1832-1827",
volume = "28",
doi = "10.1016/j.prostr.2020.11.005"
}

Hemer, A. M., Sedmak, S., Milović, L., Grbović, A.,& Sedmak, A.. (2020). FEM simulation of welded joint geometry influence on fatigue crack growth resistance. in Procedia Structural Integrity - 1st Virtual European Conference on Fracture - Vecf1
Elsevier, Amsterdam., 28, 1827-1832.
https://doi.org/10.1016/j.prostr.2020.11.005

Hemer AM, Sedmak S, Milović L, Grbović A, Sedmak A. FEM simulation of welded joint geometry influence on fatigue crack growth resistance. in Procedia Structural Integrity - 1st Virtual European Conference on Fracture - Vecf1. 2020;28:1827-1832.
doi:10.1016/j.prostr.2020.11.005 .

Hemer, Abubkr M., Sedmak, Simon, Milović, Ljubica, Grbović, Aleksandar, Sedmak, Aleksandar, "FEM simulation of welded joint geometry influence on fatigue crack growth resistance" in Procedia Structural Integrity - 1st Virtual European Conference on Fracture - Vecf1, 28 (2020):1827-1832,
https://doi.org/10.1016/j.prostr.2020.11.005 . .

TY  - JOUR
AU  - Djenadić, Stevan
AU  - Ignjatović, Dragan
AU  - Tanasijević, Miloš
AU  - Bugarić, Uglješa
AU  - Janković, Ivan
AU  - Subaranović, Tomislav
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3010
AB  - Availability is one of the most used terms in maintainability engineering. This concept is used to denote: The quality of service of an engineering system, i.e., machines, weak points' analysis, asset management, as well as making decisions in the process of life cycle management. Availability is an overall indicator and contains partial indicators that are oriented towards reliability, maintenance, and logistical support. Availability presents a variable value and changes in time and space. Usually, availability is shown as the coefficient of time use of the machine. This approach is not good enough because it does not go into the structure of the availability itself and requires a high level of IT support in system monitoring. In this sense, this paper will use the fuzzy theory and the corresponding analytic hierarchy process (AHP) multi-criteria analysis to present a conceptual and mathematical model for the assessment of availability based on expert judgment. The model will be shown in the case study (on the example) of bulldozers working in the open-pit lignite mine.
PB  - MDPI, Basel
T2  - Energies
T1  - Development of the Availability Concept by Using Fuzzy Theory with AHP Correction, a Case Study: Bulldozers in the Open-Pit Lignite Mine
IS  - 21
VL  - 12
DO  - 10.3390/en12214044
ER  - 

@article{
author = "Djenadić, Stevan and Ignjatović, Dragan and Tanasijević, Miloš and Bugarić, Uglješa and Janković, Ivan and Subaranović, Tomislav",
year = "2019",
abstract = "Availability is one of the most used terms in maintainability engineering. This concept is used to denote: The quality of service of an engineering system, i.e., machines, weak points' analysis, asset management, as well as making decisions in the process of life cycle management. Availability is an overall indicator and contains partial indicators that are oriented towards reliability, maintenance, and logistical support. Availability presents a variable value and changes in time and space. Usually, availability is shown as the coefficient of time use of the machine. This approach is not good enough because it does not go into the structure of the availability itself and requires a high level of IT support in system monitoring. In this sense, this paper will use the fuzzy theory and the corresponding analytic hierarchy process (AHP) multi-criteria analysis to present a conceptual and mathematical model for the assessment of availability based on expert judgment. The model will be shown in the case study (on the example) of bulldozers working in the open-pit lignite mine.",
publisher = "MDPI, Basel",
journal = "Energies",
title = "Development of the Availability Concept by Using Fuzzy Theory with AHP Correction, a Case Study: Bulldozers in the Open-Pit Lignite Mine",
number = "21",
volume = "12",
doi = "10.3390/en12214044"
}

Djenadić, S., Ignjatović, D., Tanasijević, M., Bugarić, U., Janković, I.,& Subaranović, T.. (2019). Development of the Availability Concept by Using Fuzzy Theory with AHP Correction, a Case Study: Bulldozers in the Open-Pit Lignite Mine. in Energies
MDPI, Basel., 12(21).
https://doi.org/10.3390/en12214044

Djenadić S, Ignjatović D, Tanasijević M, Bugarić U, Janković I, Subaranović T. Development of the Availability Concept by Using Fuzzy Theory with AHP Correction, a Case Study: Bulldozers in the Open-Pit Lignite Mine. in Energies. 2019;12(21).
doi:10.3390/en12214044 .

Djenadić, Stevan, Ignjatović, Dragan, Tanasijević, Miloš, Bugarić, Uglješa, Janković, Ivan, Subaranović, Tomislav, "Development of the Availability Concept by Using Fuzzy Theory with AHP Correction, a Case Study: Bulldozers in the Open-Pit Lignite Mine" in Energies, 12, no. 21 (2019),
https://doi.org/10.3390/en12214044 . .

TY  - CONF
AU  - Milović, Ljubica
AU  - Dojčinović, Marina
AU  - Jegdić, Bore
AU  - Anđelić, Nina
AU  - Milošević-Mitić, Vesna
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5982
AB  - The electrochemical behaviour of the P/T91 steel with martensitic microstructure as well as its behaviour 
in cavitation conditions has been investigated in this study. The electrochemical techniques used to 
analyze corrosion behaviour include Linear Polarization Resistance (LPR), Electrochemical Impedance 
Spectroscopy (EIS) and Linear Sweep Voltammetry (LSV). Corrosion rate determination was performed 
in a solution that simulates the industrial atmosphere. In laboratory conditions, ultrasonic vibratory 
cavitation test set up (stationary specimen method) has been applied on specimens made of P/T91 steel. 
Scanning electron microscopy technique has been applied to analyze the morphology of the eroded 
surfaces and to interpret the results of the cavitation tests. Test results have shown that, from the point of 
view of corrosion, P/T91 steel has a favourable chemical composition but the unfavourable lamellar martensite microstructure. Also, the morphology of surface damage from cavitation of P/T91 steel 
resembles the features of the fatigue failure. In order to evaluate the resistance to cavitation of 
investigated material, its cavitation rate was compared with those of some other martensitic steels used in 
fabrication of various industrial components for application in thermal power plants.
C3  - Abstract Book - 13th International Conference on the Mechanical Behaviour of Materials, 11-14 June, Melbourne, Australia
T1  - Corrosion and Cavitation resistance of P/T91 Steel
SP  - 187
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5982
ER  - 

@conference{
author = "Milović, Ljubica and Dojčinović, Marina and Jegdić, Bore and Anđelić, Nina and Milošević-Mitić, Vesna",
year = "2019",
abstract = "The electrochemical behaviour of the P/T91 steel with martensitic microstructure as well as its behaviour 
in cavitation conditions has been investigated in this study. The electrochemical techniques used to 
analyze corrosion behaviour include Linear Polarization Resistance (LPR), Electrochemical Impedance 
Spectroscopy (EIS) and Linear Sweep Voltammetry (LSV). Corrosion rate determination was performed 
in a solution that simulates the industrial atmosphere. In laboratory conditions, ultrasonic vibratory 
cavitation test set up (stationary specimen method) has been applied on specimens made of P/T91 steel. 
Scanning electron microscopy technique has been applied to analyze the morphology of the eroded 
surfaces and to interpret the results of the cavitation tests. Test results have shown that, from the point of 
view of corrosion, P/T91 steel has a favourable chemical composition but the unfavourable lamellar martensite microstructure. Also, the morphology of surface damage from cavitation of P/T91 steel 
resembles the features of the fatigue failure. In order to evaluate the resistance to cavitation of 
investigated material, its cavitation rate was compared with those of some other martensitic steels used in 
fabrication of various industrial components for application in thermal power plants.",
journal = "Abstract Book - 13th International Conference on the Mechanical Behaviour of Materials, 11-14 June, Melbourne, Australia",
title = "Corrosion and Cavitation resistance of P/T91 Steel",
pages = "187",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5982"
}

Milović, L., Dojčinović, M., Jegdić, B., Anđelić, N.,& Milošević-Mitić, V.. (2019). Corrosion and Cavitation resistance of P/T91 Steel. in Abstract Book - 13th International Conference on the Mechanical Behaviour of Materials, 11-14 June, Melbourne, Australia, 187.
https://hdl.handle.net/21.15107/rcub_machinery_5982

Milović L, Dojčinović M, Jegdić B, Anđelić N, Milošević-Mitić V. Corrosion and Cavitation resistance of P/T91 Steel. in Abstract Book - 13th International Conference on the Mechanical Behaviour of Materials, 11-14 June, Melbourne, Australia. 2019;:187.
https://hdl.handle.net/21.15107/rcub_machinery_5982 .

Milović, Ljubica, Dojčinović, Marina, Jegdić, Bore, Anđelić, Nina, Milošević-Mitić, Vesna, "Corrosion and Cavitation resistance of P/T91 Steel" in Abstract Book - 13th International Conference on the Mechanical Behaviour of Materials, 11-14 June, Melbourne, Australia (2019):187,
https://hdl.handle.net/21.15107/rcub_machinery_5982 .