TY  - CONF
AU  - Smoljanić, Tamara
AU  - Sedmak, Simon
AU  - Milovanović, Aleksa
AU  - Milović, Ljubica
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7110
AB  - One of the most important aspects of materials typically used in biomedical engineering is their resistance to various unfavourable exploitation conditions, which greatly impact their work life. In terms of extreme conditions, two major factors include fatigue and corrosion, and a combination of these can significantly decrease the expected life of various implants. The focus of this paper will be on hip implants made of Ti-Al6-4V titanium alloy, a material commonly used in such applications, due to its resistance to corrosion and bio-compatibility. Research shown here was based on experimental testing of said alloy in order to determine its mechanical properties under different working environments, including normal, salty and wet conditions. These properties were then used as input data for Extended Finite Element method (XFEM) numerical simulations of fatigue crack growth in hip implants with various geometries. This was of particular interest since specimens which were kept in salty and wet environment had a slight degradation of yield stress and tensile strength, but an increase in plasticity.
C3  - Procedia Structural Integrity
T1  - Numerical simulation of fatigue crack growth in Ti-Al6-V4 hip implants under different exploitation conditions
EP  - 221
SP  - 215
VL  - 48
DO  - 10.1016/j.prostr.2023.07.151
ER  - 

@conference{
author = "Smoljanić, Tamara and Sedmak, Simon and Milovanović, Aleksa and Milović, Ljubica",
year = "2023",
abstract = "One of the most important aspects of materials typically used in biomedical engineering is their resistance to various unfavourable exploitation conditions, which greatly impact their work life. In terms of extreme conditions, two major factors include fatigue and corrosion, and a combination of these can significantly decrease the expected life of various implants. The focus of this paper will be on hip implants made of Ti-Al6-4V titanium alloy, a material commonly used in such applications, due to its resistance to corrosion and bio-compatibility. Research shown here was based on experimental testing of said alloy in order to determine its mechanical properties under different working environments, including normal, salty and wet conditions. These properties were then used as input data for Extended Finite Element method (XFEM) numerical simulations of fatigue crack growth in hip implants with various geometries. This was of particular interest since specimens which were kept in salty and wet environment had a slight degradation of yield stress and tensile strength, but an increase in plasticity.",
journal = "Procedia Structural Integrity",
title = "Numerical simulation of fatigue crack growth in Ti-Al6-V4 hip implants under different exploitation conditions",
pages = "221-215",
volume = "48",
doi = "10.1016/j.prostr.2023.07.151"
}

Smoljanić, T., Sedmak, S., Milovanović, A.,& Milović, L.. (2023). Numerical simulation of fatigue crack growth in Ti-Al6-V4 hip implants under different exploitation conditions. in Procedia Structural Integrity, 48, 215-221.
https://doi.org/10.1016/j.prostr.2023.07.151

Smoljanić T, Sedmak S, Milovanović A, Milović L. Numerical simulation of fatigue crack growth in Ti-Al6-V4 hip implants under different exploitation conditions. in Procedia Structural Integrity. 2023;48:215-221.
doi:10.1016/j.prostr.2023.07.151 .

Smoljanić, Tamara, Sedmak, Simon, Milovanović, Aleksa, Milović, Ljubica, "Numerical simulation of fatigue crack growth in Ti-Al6-V4 hip implants under different exploitation conditions" in Procedia Structural Integrity, 48 (2023):215-221,
https://doi.org/10.1016/j.prostr.2023.07.151 . .

TY  - JOUR
AU  - Smoljanić, Tamara
AU  - Milovanović, Aleksa
AU  - Sedmak, Simon
AU  - Milović, Ljubica
AU  - Sedmak, Aleksandar
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7428
AB  - This paper presents development of numerical models for simulation of the behaviour of titanium alloy hip implants under static and dynamic loads, which is a part of extensive research involving the structural integrity of such implants under various loading conditions, as well as under exposure to aggressive environments. Numerical models were created in ABAQUS and ANSYS software packages, in order to determine the stress/strain distribution, the number of cycles to failure and stress intensity factors, for two different hip implant geometries. The ABAQUS models were used for static and ANSYS models for dynamic loads. The next stage in this analysis involved comparing these two cases, to determine the one with the better behaviour, depending on the exploitation conditions, which can greatly vary between different groups of patients. The targeted patient weight for all numerical simulations was 90 kg, while failure assessment diagrams were made for both implant geometries, assuming a crack length of 1 mm.
T2  - HEMIJSKA INDUSTRIJA (Chemical Industry)
T1  - Numerical simulation of titanium alloy hip replacement implants behaviour under static and dynamic loads
DO  - 10.2298/HEMIND221118026S
ER  - 

@article{
author = "Smoljanić, Tamara and Milovanović, Aleksa and Sedmak, Simon and Milović, Ljubica and Sedmak, Aleksandar",
year = "2023",
abstract = "This paper presents development of numerical models for simulation of the behaviour of titanium alloy hip implants under static and dynamic loads, which is a part of extensive research involving the structural integrity of such implants under various loading conditions, as well as under exposure to aggressive environments. Numerical models were created in ABAQUS and ANSYS software packages, in order to determine the stress/strain distribution, the number of cycles to failure and stress intensity factors, for two different hip implant geometries. The ABAQUS models were used for static and ANSYS models for dynamic loads. The next stage in this analysis involved comparing these two cases, to determine the one with the better behaviour, depending on the exploitation conditions, which can greatly vary between different groups of patients. The targeted patient weight for all numerical simulations was 90 kg, while failure assessment diagrams were made for both implant geometries, assuming a crack length of 1 mm.",
journal = "HEMIJSKA INDUSTRIJA (Chemical Industry)",
title = "Numerical simulation of titanium alloy hip replacement implants behaviour under static and dynamic loads",
doi = "10.2298/HEMIND221118026S"
}

Smoljanić, T., Milovanović, A., Sedmak, S., Milović, L.,& Sedmak, A.. (2023). Numerical simulation of titanium alloy hip replacement implants behaviour under static and dynamic loads. in HEMIJSKA INDUSTRIJA (Chemical Industry).
https://doi.org/10.2298/HEMIND221118026S

Smoljanić T, Milovanović A, Sedmak S, Milović L, Sedmak A. Numerical simulation of titanium alloy hip replacement implants behaviour under static and dynamic loads. in HEMIJSKA INDUSTRIJA (Chemical Industry). 2023;.
doi:10.2298/HEMIND221118026S .

Smoljanić, Tamara, Milovanović, Aleksa, Sedmak, Simon, Milović, Ljubica, Sedmak, Aleksandar, "Numerical simulation of titanium alloy hip replacement implants behaviour under static and dynamic loads" in HEMIJSKA INDUSTRIJA (Chemical Industry) (2023),
https://doi.org/10.2298/HEMIND221118026S . .

TY  - JOUR
AU  - Smoljanić, Tamara
AU  - Sedmak, Simon
AU  - Sedmak, Aleksandar
AU  - Burzić, Zijah
AU  - Milovanović, Aleksa
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7200
AB  - The paper involves experimental testing of titanium alloy Ti-6Al-4V specimens, based on which numerical models are made to provide the basis for further investigation. Due to the exploitation conditions these implants are subjected to, experimental tensile tests are performed on three types of specimens: regular type, and specimens previously subjected to the effects of humid and salty environment. The goal is to determine how these extreme conditions affect mechanical properties of Ti-6Al-4V alloy, along with the development of numerical models which could accurately simulate the behaviour of real specimens.
PB  - Society for Structural Integrity and Life
PB  - IMS Institute
T2  - STRUCTURAL INTEGRITY AND LIFE
T1  - Experimental and numerical investigation of Ti-6Al-4V alloy behaviour under different exploitation conditions
EP  - 357
IS  - 3
SP  - 353
VL  - 22
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7200
ER  - 

@article{
author = "Smoljanić, Tamara and Sedmak, Simon and Sedmak, Aleksandar and Burzić, Zijah and Milovanović, Aleksa",
year = "2022",
abstract = "The paper involves experimental testing of titanium alloy Ti-6Al-4V specimens, based on which numerical models are made to provide the basis for further investigation. Due to the exploitation conditions these implants are subjected to, experimental tensile tests are performed on three types of specimens: regular type, and specimens previously subjected to the effects of humid and salty environment. The goal is to determine how these extreme conditions affect mechanical properties of Ti-6Al-4V alloy, along with the development of numerical models which could accurately simulate the behaviour of real specimens.",
publisher = "Society for Structural Integrity and Life, IMS Institute",
journal = "STRUCTURAL INTEGRITY AND LIFE",
title = "Experimental and numerical investigation of Ti-6Al-4V alloy behaviour under different exploitation conditions",
pages = "357-353",
number = "3",
volume = "22",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7200"
}

Smoljanić, T., Sedmak, S., Sedmak, A., Burzić, Z.,& Milovanović, A.. (2022). Experimental and numerical investigation of Ti-6Al-4V alloy behaviour under different exploitation conditions. in STRUCTURAL INTEGRITY AND LIFE
Society for Structural Integrity and Life., 22(3), 353-357.
https://hdl.handle.net/21.15107/rcub_machinery_7200

Smoljanić T, Sedmak S, Sedmak A, Burzić Z, Milovanović A. Experimental and numerical investigation of Ti-6Al-4V alloy behaviour under different exploitation conditions. in STRUCTURAL INTEGRITY AND LIFE. 2022;22(3):353-357.
https://hdl.handle.net/21.15107/rcub_machinery_7200 .

Smoljanić, Tamara, Sedmak, Simon, Sedmak, Aleksandar, Burzić, Zijah, Milovanović, Aleksa, "Experimental and numerical investigation of Ti-6Al-4V alloy behaviour under different exploitation conditions" in STRUCTURAL INTEGRITY AND LIFE, 22, no. 3 (2022):353-357,
https://hdl.handle.net/21.15107/rcub_machinery_7200 .

TY  - JOUR
AU  - Jovanović, Aleksandar
AU  - Đorđević, Branislav
AU  - Jeremić, Lazar
AU  - Milovanović, Nikola
AU  - Mijatović, Tamara
PY  - 2022
UR  - http://divk.inovacionicentar.rs/ivk/ivk2203conts.html
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6253
AB  - The paper describes the reconstruction procedure of 3 autoclaves, i.e. equipment used for drying raw coal. Due to material degradation in working conditions and damage, the lower part of the autoclave, of steel Altherm 55 (commercially known) is completely replaced by 18 Mn Mo4-5+NT
(commercially known), in order to extend service life of this pressure equipment and increase plant reliability. The reconstruction procedure of autoclaves is presented, i.e., the welding technology for the lower (new) part of the autoclaves. Structural integrity assessment is performed by NDT methods and hydrotests on reconstructed equipment before recommissioning, as well as for the strict criterion of the quality requirement of welded joints exposed to dangerous working fluids.
T2  - STRUCTURAL INTEGRITY AND LIFE
T1  - Integrity assessment of autoclaves after reconstruction
EP  - 352
IS  - 3
SP  - 347
VL  - 22
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6253
ER  - 

@article{
author = "Jovanović, Aleksandar and Đorđević, Branislav and Jeremić, Lazar and Milovanović, Nikola and Mijatović, Tamara",
year = "2022",
abstract = "The paper describes the reconstruction procedure of 3 autoclaves, i.e. equipment used for drying raw coal. Due to material degradation in working conditions and damage, the lower part of the autoclave, of steel Altherm 55 (commercially known) is completely replaced by 18 Mn Mo4-5+NT
(commercially known), in order to extend service life of this pressure equipment and increase plant reliability. The reconstruction procedure of autoclaves is presented, i.e., the welding technology for the lower (new) part of the autoclaves. Structural integrity assessment is performed by NDT methods and hydrotests on reconstructed equipment before recommissioning, as well as for the strict criterion of the quality requirement of welded joints exposed to dangerous working fluids.",
journal = "STRUCTURAL INTEGRITY AND LIFE",
title = "Integrity assessment of autoclaves after reconstruction",
pages = "352-347",
number = "3",
volume = "22",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6253"
}

Jovanović, A., Đorđević, B., Jeremić, L., Milovanović, N.,& Mijatović, T.. (2022). Integrity assessment of autoclaves after reconstruction. in STRUCTURAL INTEGRITY AND LIFE, 22(3), 347-352.
https://hdl.handle.net/21.15107/rcub_machinery_6253

Jovanović A, Đorđević B, Jeremić L, Milovanović N, Mijatović T. Integrity assessment of autoclaves after reconstruction. in STRUCTURAL INTEGRITY AND LIFE. 2022;22(3):347-352.
https://hdl.handle.net/21.15107/rcub_machinery_6253 .

Jovanović, Aleksandar, Đorđević, Branislav, Jeremić, Lazar, Milovanović, Nikola, Mijatović, Tamara, "Integrity assessment of autoclaves after reconstruction" in STRUCTURAL INTEGRITY AND LIFE, 22, no. 3 (2022):347-352,
https://hdl.handle.net/21.15107/rcub_machinery_6253 .

TY  - CONF
AU  - Tanasković, Drakče
AU  - Pefrović, Slobodan
AU  - Đorđević, Branislav R.
AU  - Matavz, Albin
AU  - Mijatović, Tamara
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3645
AB  - The paper shows the comparison of different methodologies for defining the quality of base material due for repair welding as one of the basic and initial problems during the repair of damaged parts or machine equipment. The quality of a previously damaged repaired machine part depends on successfully defined quality of base material. In addition to the analysis of discussed methodologies, the paper also provides an algorithm for decision flow between different methodologies. The overall analysis is performed in cooperation with employees in HBIS GROUP company Serbia Iron & Steel, Smederevo, as result of experiences and cases during maintaining of the facility. The proposed algorithm is designed in order to predominantly help engineers in the decision making with the goal to establish and create an appropriate repair welding procedure so to achieve required integrity of the machine/structure.
PB  - Institut za ispitivanje materijala, Beograd
C3  - Structural Integrity and Life
T1  - Algorithm for defining quality of base material for repair welding
EP  - 284
IS  - 3
SP  - 279
VL  - 21
UR  - https://hdl.handle.net/21.15107/rcub_machinery_3645
ER  - 

@conference{
author = "Tanasković, Drakče and Pefrović, Slobodan and Đorđević, Branislav R. and Matavz, Albin and Mijatović, Tamara",
year = "2021",
abstract = "The paper shows the comparison of different methodologies for defining the quality of base material due for repair welding as one of the basic and initial problems during the repair of damaged parts or machine equipment. The quality of a previously damaged repaired machine part depends on successfully defined quality of base material. In addition to the analysis of discussed methodologies, the paper also provides an algorithm for decision flow between different methodologies. The overall analysis is performed in cooperation with employees in HBIS GROUP company Serbia Iron & Steel, Smederevo, as result of experiences and cases during maintaining of the facility. The proposed algorithm is designed in order to predominantly help engineers in the decision making with the goal to establish and create an appropriate repair welding procedure so to achieve required integrity of the machine/structure.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "Algorithm for defining quality of base material for repair welding",
pages = "284-279",
number = "3",
volume = "21",
url = "https://hdl.handle.net/21.15107/rcub_machinery_3645"
}

Tanasković, D., Pefrović, S., Đorđević, B. R., Matavz, A.,& Mijatović, T.. (2021). Algorithm for defining quality of base material for repair welding. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 21(3), 279-284.
https://hdl.handle.net/21.15107/rcub_machinery_3645

Tanasković D, Pefrović S, Đorđević BR, Matavz A, Mijatović T. Algorithm for defining quality of base material for repair welding. in Structural Integrity and Life. 2021;21(3):279-284.
https://hdl.handle.net/21.15107/rcub_machinery_3645 .

Tanasković, Drakče, Pefrović, Slobodan, Đorđević, Branislav R., Matavz, Albin, Mijatović, Tamara, "Algorithm for defining quality of base material for repair welding" in Structural Integrity and Life, 21, no. 3 (2021):279-284,
https://hdl.handle.net/21.15107/rcub_machinery_3645 .

TY  - JOUR
AU  - Milovanović, Aleksandar M.
AU  - Mijatović, Tamara
AU  - Diković, Ljubica
AU  - Trumbulović, Ljiljana
AU  - Drndarević, Branko
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3643
AB  - Stress distribution, as obtained by finite element method (FEM), and corresponding fracture mechanics parameters, have been used for the integrity assessment of a pressure vessel. Once the stress distribution is known, the most critical area can be analysed with assumed crack to estimate its critical length according to fracture mechanics parameters and basic laws. Toward this end, the Failure Assessment Diagram (FAD) is used to calculate the crack length corresponding to the limit curve. As one can see, coordinates in FAD are the ratio of net- and critical stress (x axis, S-r = S-n/S-c), and ratio of stress intensity factor and its critical value (y axis, K-r = K-i/K-Ic). Once net stress and the stress intensity factor are known and their critical values, coordinates of a point corresponding to any crack length can be calculated and positioned in the FAD.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity and Life
T1  - Structural integrity analysis of a cracked pressure vessel
EP  - 289
IS  - 3
SP  - 285
VL  - 21
UR  - https://hdl.handle.net/21.15107/rcub_machinery_3643
ER  - 

@article{
author = "Milovanović, Aleksandar M. and Mijatović, Tamara and Diković, Ljubica and Trumbulović, Ljiljana and Drndarević, Branko",
year = "2021",
abstract = "Stress distribution, as obtained by finite element method (FEM), and corresponding fracture mechanics parameters, have been used for the integrity assessment of a pressure vessel. Once the stress distribution is known, the most critical area can be analysed with assumed crack to estimate its critical length according to fracture mechanics parameters and basic laws. Toward this end, the Failure Assessment Diagram (FAD) is used to calculate the crack length corresponding to the limit curve. As one can see, coordinates in FAD are the ratio of net- and critical stress (x axis, S-r = S-n/S-c), and ratio of stress intensity factor and its critical value (y axis, K-r = K-i/K-Ic). Once net stress and the stress intensity factor are known and their critical values, coordinates of a point corresponding to any crack length can be calculated and positioned in the FAD.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "Structural integrity analysis of a cracked pressure vessel",
pages = "289-285",
number = "3",
volume = "21",
url = "https://hdl.handle.net/21.15107/rcub_machinery_3643"
}

Milovanović, A. M., Mijatović, T., Diković, L., Trumbulović, L.,& Drndarević, B.. (2021). Structural integrity analysis of a cracked pressure vessel. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 21(3), 285-289.
https://hdl.handle.net/21.15107/rcub_machinery_3643

Milovanović AM, Mijatović T, Diković L, Trumbulović L, Drndarević B. Structural integrity analysis of a cracked pressure vessel. in Structural Integrity and Life. 2021;21(3):285-289.
https://hdl.handle.net/21.15107/rcub_machinery_3643 .

Milovanović, Aleksandar M., Mijatović, Tamara, Diković, Ljubica, Trumbulović, Ljiljana, Drndarević, Branko, "Structural integrity analysis of a cracked pressure vessel" in Structural Integrity and Life, 21, no. 3 (2021):285-289,
https://hdl.handle.net/21.15107/rcub_machinery_3643 .

TY  - CONF
AU  - Milovanović, Aleksa
AU  - Sedmak, Aleksandar
AU  - Grbović, Aleksandar
AU  - Mijatović, Tamara
AU  - Čolić, Katarina
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3311
AB  - The main concerns in design of hip implants are fracture and fatigue related issues. In this paper, reverse engineering is used to redesign a hip implant produced by precision casting, using Ti6Al4V Extra Low Interstitials (ELI) alloy. As the most critical part, hip neck has been in the focus of this analysis, keeping in mind that the lower the thickness is, the higher the movement of joint may be, but affecting its structural integrity at the same time. Thus, 5 different models are created with different neck thickness and analyzed by using the Finite Element Method (FEM) for stress-strain calculation and extended FEM (XFEM) for fatigue crack growth.
PB  - Elsevier Science Bv, Amsterdam
C3  - Procedia Structural Integrity - 1st Medit Conf Fracture & Structural Integrity (Medfract1)
T1  - Design Aspects of Hip Implant Made of Ti-6Al-4V Extra Low Interstitials Alloy
EP  - 305
SP  - 299
VL  - 26
DO  - 10.1016/j.prostr.2020.06.038
ER  - 

@conference{
author = "Milovanović, Aleksa and Sedmak, Aleksandar and Grbović, Aleksandar and Mijatović, Tamara and Čolić, Katarina",
year = "2020",
abstract = "The main concerns in design of hip implants are fracture and fatigue related issues. In this paper, reverse engineering is used to redesign a hip implant produced by precision casting, using Ti6Al4V Extra Low Interstitials (ELI) alloy. As the most critical part, hip neck has been in the focus of this analysis, keeping in mind that the lower the thickness is, the higher the movement of joint may be, but affecting its structural integrity at the same time. Thus, 5 different models are created with different neck thickness and analyzed by using the Finite Element Method (FEM) for stress-strain calculation and extended FEM (XFEM) for fatigue crack growth.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Procedia Structural Integrity - 1st Medit Conf Fracture & Structural Integrity (Medfract1)",
title = "Design Aspects of Hip Implant Made of Ti-6Al-4V Extra Low Interstitials Alloy",
pages = "305-299",
volume = "26",
doi = "10.1016/j.prostr.2020.06.038"
}

Milovanović, A., Sedmak, A., Grbović, A., Mijatović, T.,& Čolić, K.. (2020). Design Aspects of Hip Implant Made of Ti-6Al-4V Extra Low Interstitials Alloy. in Procedia Structural Integrity - 1st Medit Conf Fracture & Structural Integrity (Medfract1)
Elsevier Science Bv, Amsterdam., 26, 299-305.
https://doi.org/10.1016/j.prostr.2020.06.038

Milovanović A, Sedmak A, Grbović A, Mijatović T, Čolić K. Design Aspects of Hip Implant Made of Ti-6Al-4V Extra Low Interstitials Alloy. in Procedia Structural Integrity - 1st Medit Conf Fracture & Structural Integrity (Medfract1). 2020;26:299-305.
doi:10.1016/j.prostr.2020.06.038 .

Milovanović, Aleksa, Sedmak, Aleksandar, Grbović, Aleksandar, Mijatović, Tamara, Čolić, Katarina, "Design Aspects of Hip Implant Made of Ti-6Al-4V Extra Low Interstitials Alloy" in Procedia Structural Integrity - 1st Medit Conf Fracture & Structural Integrity (Medfract1), 26 (2020):299-305,
https://doi.org/10.1016/j.prostr.2020.06.038 . .

TY  - JOUR
AU  - Mijatović, Tamara
AU  - Manjgo, Mersida
AU  - Burzić, Meri
AU  - Čolić, Katarina
AU  - Burzić, Zijah
AU  - Vuherer, Tomaž
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3209
AB  - An increasing diversity of operations and different materials, as well as different working conditions lead to various construction solutions. Structural design is the preparation of structures that shall be efficient in fulfilling anticipated exploitation conditions, both economically and safely, i.e. there will be no damage resulting in the loss of structural functionality in service. In practice, however, there are fractures that can occur during construction, assembly, and exploitation. Fracture may be caused by overloads, by static fracture, or by dynamic loads, and by fatigue. Upon calculation of static structural durability, normal and tangential stresses are taken into account, while the dynamic durability calculation defines structural resistance to crack formation and its propagation under dynamic loading. The aim of this paper is to demonstrate the possibility of applying fracture mechanics to structural integrity assessment. To this end, the basic concepts of linear elastic fracture mechanics will be explained.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity and Life
T1  - Structural integrity assessment from the aspect of fracture mechanics
EP  - 124
IS  - 2
SP  - 121
VL  - 19
UR  - https://hdl.handle.net/21.15107/rcub_machinery_3209
ER  - 

@article{
author = "Mijatović, Tamara and Manjgo, Mersida and Burzić, Meri and Čolić, Katarina and Burzić, Zijah and Vuherer, Tomaž",
year = "2019",
abstract = "An increasing diversity of operations and different materials, as well as different working conditions lead to various construction solutions. Structural design is the preparation of structures that shall be efficient in fulfilling anticipated exploitation conditions, both economically and safely, i.e. there will be no damage resulting in the loss of structural functionality in service. In practice, however, there are fractures that can occur during construction, assembly, and exploitation. Fracture may be caused by overloads, by static fracture, or by dynamic loads, and by fatigue. Upon calculation of static structural durability, normal and tangential stresses are taken into account, while the dynamic durability calculation defines structural resistance to crack formation and its propagation under dynamic loading. The aim of this paper is to demonstrate the possibility of applying fracture mechanics to structural integrity assessment. To this end, the basic concepts of linear elastic fracture mechanics will be explained.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "Structural integrity assessment from the aspect of fracture mechanics",
pages = "124-121",
number = "2",
volume = "19",
url = "https://hdl.handle.net/21.15107/rcub_machinery_3209"
}

Mijatović, T., Manjgo, M., Burzić, M., Čolić, K., Burzić, Z.,& Vuherer, T.. (2019). Structural integrity assessment from the aspect of fracture mechanics. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 19(2), 121-124.
https://hdl.handle.net/21.15107/rcub_machinery_3209

Mijatović T, Manjgo M, Burzić M, Čolić K, Burzić Z, Vuherer T. Structural integrity assessment from the aspect of fracture mechanics. in Structural Integrity and Life. 2019;19(2):121-124.
https://hdl.handle.net/21.15107/rcub_machinery_3209 .

Mijatović, Tamara, Manjgo, Mersida, Burzić, Meri, Čolić, Katarina, Burzić, Zijah, Vuherer, Tomaž, "Structural integrity assessment from the aspect of fracture mechanics" in Structural Integrity and Life, 19, no. 2 (2019):121-124,
https://hdl.handle.net/21.15107/rcub_machinery_3209 .

TY  - JOUR
AU  - Mijatović, Tamara
AU  - Milovanović, Aleksa
AU  - Sedmak, Aleksandar
AU  - Milović, Ljubica
AU  - Čolić, Katarina
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3213
AB  - Total hip replacement implants are used as an artificial replacement for disfunctional hips in order to sustain joint movement. Chosen material and design of total hip replacement are the most influential factors for artificial joint utilization. Selected total hip replacement is obtained by precision casting method, made from Ti6Al4V ELI (Extra Low Interstitials) alloy. In order to acquire a geometrical model of chosen implant, the 3D scanner is used and an obtained point cloud (PC), then exploited for reverse engineering to a CAD model. The neck thickness of implant affects angle of movement of the joint and structural integrity. Reducing the thickness of the neck section results in higher movement of the joint, but inversely affects its structural integrity. The 3D scanned implant has a neck thickness of 14.6 mm, and data from literature suggest that the best movement angle is for 9 mm thickness of the implant. In order to redesign the available implant, five different models with a neck thickness between 9 and 14.6 mm are made. Obtained results show the thickness effects the stress distribution in a critical area.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity and Life
T1  - Integrity assessment of reverse engineered ti-6al-4v eli total hip replacement implant
EP  - 242
IS  - 3
SP  - 237
VL  - 19
UR  - https://hdl.handle.net/21.15107/rcub_technorep_4195
ER  - 

@article{
author = "Mijatović, Tamara and Milovanović, Aleksa and Sedmak, Aleksandar and Milović, Ljubica and Čolić, Katarina",
year = "2019",
abstract = "Total hip replacement implants are used as an artificial replacement for disfunctional hips in order to sustain joint movement. Chosen material and design of total hip replacement are the most influential factors for artificial joint utilization. Selected total hip replacement is obtained by precision casting method, made from Ti6Al4V ELI (Extra Low Interstitials) alloy. In order to acquire a geometrical model of chosen implant, the 3D scanner is used and an obtained point cloud (PC), then exploited for reverse engineering to a CAD model. The neck thickness of implant affects angle of movement of the joint and structural integrity. Reducing the thickness of the neck section results in higher movement of the joint, but inversely affects its structural integrity. The 3D scanned implant has a neck thickness of 14.6 mm, and data from literature suggest that the best movement angle is for 9 mm thickness of the implant. In order to redesign the available implant, five different models with a neck thickness between 9 and 14.6 mm are made. Obtained results show the thickness effects the stress distribution in a critical area.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "Integrity assessment of reverse engineered ti-6al-4v eli total hip replacement implant",
pages = "242-237",
number = "3",
volume = "19",
url = "https://hdl.handle.net/21.15107/rcub_technorep_4195"
}

Mijatović, T., Milovanović, A., Sedmak, A., Milović, L.,& Čolić, K.. (2019). Integrity assessment of reverse engineered ti-6al-4v eli total hip replacement implant. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 19(3), 237-242.
https://hdl.handle.net/21.15107/rcub_technorep_4195

Mijatović T, Milovanović A, Sedmak A, Milović L, Čolić K. Integrity assessment of reverse engineered ti-6al-4v eli total hip replacement implant. in Structural Integrity and Life. 2019;19(3):237-242.
https://hdl.handle.net/21.15107/rcub_technorep_4195 .

Mijatović, Tamara, Milovanović, Aleksa, Sedmak, Aleksandar, Milović, Ljubica, Čolić, Katarina, "Integrity assessment of reverse engineered ti-6al-4v eli total hip replacement implant" in Structural Integrity and Life, 19, no. 3 (2019):237-242,
https://hdl.handle.net/21.15107/rcub_technorep_4195 .

TY  - JOUR
AU  - Mijatović, Tamara
AU  - Perić, Milica
AU  - Matović, Luka
AU  - Ristović, Marija
AU  - Drmanić, Saša
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2753
AB  - U ovom radu je izvršena sinteza šest estarskih derivata 2,6 dimetil4-supstituisane-1,4-dihidropiridin-3,5-dikarboksilne kiseline: dietil2,6-dimetil-4-fenil-1,4-dihidropiridin-3,5 dikarboksilata, dietil-2,6dimetil-4-(3'-nitrofenil)-1,4 dihidropiridin-3,5-dikarboksilata, dietil2,6-dimetil-4-(4' nitrofenil)-1,4-dihidropiridin-3,5-dikarboksilata, dietil-4-(2'-hidroksifenil)-2,6-dimetil-1,4-dihidropiridin-3,5dikarboksilata, dietil-4-(3'-hidroksifenil)-2,6-dimetil-1,4dihidropiridin-3,5-dikarboksilata i dietil-4-(4'-hidroksifenil)-2,6dimetil-1,4-dihidropiridin-3,5-dikarboksilata. Dobijena jedinjenja su zatim korišćena kao polazna za sintezu sledećih amida: 2,6-dimetil-4-N3,N5-di(tiazol-2-il)-1,4dihidropiridin-3,5-dikarboksiamida, 2,6-dimetil-4-(3'-nitrofenil)-N3,N5-di(tiazol-2-il)-1,4-dihidropiridin-3,5-dikarboksiamida, 2,6dimetil-4-(4'-nitrofenil)-N3,N5-di(tiazol-2-il)-1,4-dihidropiridin-3,5dikarboksiamida, 4-(2'-hidroksifenil)-2,6-dimetil-N3,N5-di(tiazol-2il)-1,4-dihidropiridin-3,5-dikarboksiamida, 4-(3'-hidroksifenil)-2,6dimetil-N3,N5-di(tiazol-2-il)-1,4-dihidropiridin-3,5-dikarboksiamida i 4-(4'-hidroksifenil)-2,6-dimetil-N3,N5-di(tiazol-2-il)-1,4dihidropiridin-3,5-dikarboksiamida. Amidni derivati 2,6-dimetil-4supstituisane-1,4-dihidropiridin-3,5-dikarboksilne kiseline su sintetisani u cilju utvrđivanja uticaja tipa i položaja supstituenta u molekulu na antioksidativnu aktivnost. Iz ove serije, najnižu vrednost IC50, tj. najbolju antioksidativnu aktivnost je pokazao 4(2'-hidroksifenil)-2,6-dimetil-N3,N5-di(tiazol-2-il)-1,4dihidropiridin-3,5-dikarboksiamid, dok su zanemarljive vrednosti pokazali 2,6-dimetil-4-N3,N5-di(tiazol-2-il)-1,4-dihidropiridin-3,5dikarboksiamid i 2,6-dimetil-4-(3'-nitrofenil)-N3,N5-di(tiazol-2-il)-1,4-dihidropiridin-3,5-dikarboksiamid. Ispitivanje antioksidativne aktivnosti je izvršeno merenjem sposobnosti jedinjenja da hvataju slobodne radikale primenom metode inhibicije pomoću DPPH (1,1difenil-2-pikril-hidrazil) radikala. Sintetisana jedinjenja su okarakterisana temperaturom topljenja, elementalnom analizom i FT-IR spektroskopijom.
AB  - Six ester and amide derivates of 2,6-dimethyl-4-(substituted)-1,4-dihydropyridine-3,5-dicarboxylic acid have been synthesized in this paper, including: diethyl 2,6-dimethyl-4-phenyl-1,4-dihydropyridine-3,5dicarboxylate, diethyl 2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, diethyl 2,6dimethyl-4-(4-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, diethyl 4-(2-hydroxyphenyl)-2,6dimethyl-1,4-dihydropyridine-3,5-dicarboxylate, diethyl 4-(3-hydroxyphenyl)-2,6-dimethyl-1,4dihydropyridine-3,5-dicarboxylate and diethyl 4-(4-hydroxyphenyl)-2,6-dimethyl-1,4-dihydropyridine-3,5dicarboxylate. Obtained ester derivates were used afterwards as a starting compounds for synthesis of amide derivates, including: 2,6-dimethyl-4-phenyl-N3,N5-di(thiazol-2-yl)-1,4-dihydropyridine-3,5-dicarboxamide, 2,6dimethyl-4-(3-nitrophenyl)-N3,N5-di(thiazol-2-yl)-1,4-dihydropyridine-3,5-dicarboxamide, 2,6-dimethyl-4(4-nitrophenyl)-N3,N5-di(thiazol-2-yl)-1,4-dihydropyridine-3,5-dicarboxamide, 4-(2-hydroxyphenyl)-2,6dimethyl-N3,N5-di(thiazol-2-yl)-1,4-dihydropyridine-3,5-dicarboxamide, 4-(3-hydroxyphenyl)-2,6-dimethylN3,N5-di(thiazol-2-yl)-1,4-dihydropyridine-3,5-dicarboxamide and 4-(4-hydroxyphenyl)-2,6-dimethylN3,N5-di(thiazol-2-yl)-1,4-dihydropyridine-3,5-dicarboxamide. Obtained compounds were characterized by melting point, elementary analysis and FT-IR spectroscopy. In order to determine the effect of the substituent, the antioxidative activity assay of obtained 1,4dihydropyridines was performed by using the DPPH (1,1-diphenyl-2-picryl-hydrazyl) free radical scavenging method.
PB  - University of East Sarajevo, Faculty of Technology
T2  - Journal of Engineering and Processing Management
T1  - Sinteza, karakterizacija i ispitivanje antioksidativne aktivnosti estarskih i amidnih derivata 2,6-dimetil-4-supstituisane-1,4-dihidropiridin-3,5-dikarboksilne kiseline
T1  - Synthesis, characterization and antioxidative assay of ester and amide derivates of 2,6-dimethyl-4-(substituted)-1,4dihydropyridine-3,5-dicarboxylic acid
EP  - 15
IS  - 2
SP  - 8
VL  - 10
DO  - 10.7251/JEPM181002008M
ER  - 

@article{
author = "Mijatović, Tamara and Perić, Milica and Matović, Luka and Ristović, Marija and Drmanić, Saša",
year = "2018",
abstract = "U ovom radu je izvršena sinteza šest estarskih derivata 2,6 dimetil4-supstituisane-1,4-dihidropiridin-3,5-dikarboksilne kiseline: dietil2,6-dimetil-4-fenil-1,4-dihidropiridin-3,5 dikarboksilata, dietil-2,6dimetil-4-(3'-nitrofenil)-1,4 dihidropiridin-3,5-dikarboksilata, dietil2,6-dimetil-4-(4' nitrofenil)-1,4-dihidropiridin-3,5-dikarboksilata, dietil-4-(2'-hidroksifenil)-2,6-dimetil-1,4-dihidropiridin-3,5dikarboksilata, dietil-4-(3'-hidroksifenil)-2,6-dimetil-1,4dihidropiridin-3,5-dikarboksilata i dietil-4-(4'-hidroksifenil)-2,6dimetil-1,4-dihidropiridin-3,5-dikarboksilata. Dobijena jedinjenja su zatim korišćena kao polazna za sintezu sledećih amida: 2,6-dimetil-4-N3,N5-di(tiazol-2-il)-1,4dihidropiridin-3,5-dikarboksiamida, 2,6-dimetil-4-(3'-nitrofenil)-N3,N5-di(tiazol-2-il)-1,4-dihidropiridin-3,5-dikarboksiamida, 2,6dimetil-4-(4'-nitrofenil)-N3,N5-di(tiazol-2-il)-1,4-dihidropiridin-3,5dikarboksiamida, 4-(2'-hidroksifenil)-2,6-dimetil-N3,N5-di(tiazol-2il)-1,4-dihidropiridin-3,5-dikarboksiamida, 4-(3'-hidroksifenil)-2,6dimetil-N3,N5-di(tiazol-2-il)-1,4-dihidropiridin-3,5-dikarboksiamida i 4-(4'-hidroksifenil)-2,6-dimetil-N3,N5-di(tiazol-2-il)-1,4dihidropiridin-3,5-dikarboksiamida. Amidni derivati 2,6-dimetil-4supstituisane-1,4-dihidropiridin-3,5-dikarboksilne kiseline su sintetisani u cilju utvrđivanja uticaja tipa i položaja supstituenta u molekulu na antioksidativnu aktivnost. Iz ove serije, najnižu vrednost IC50, tj. najbolju antioksidativnu aktivnost je pokazao 4(2'-hidroksifenil)-2,6-dimetil-N3,N5-di(tiazol-2-il)-1,4dihidropiridin-3,5-dikarboksiamid, dok su zanemarljive vrednosti pokazali 2,6-dimetil-4-N3,N5-di(tiazol-2-il)-1,4-dihidropiridin-3,5dikarboksiamid i 2,6-dimetil-4-(3'-nitrofenil)-N3,N5-di(tiazol-2-il)-1,4-dihidropiridin-3,5-dikarboksiamid. Ispitivanje antioksidativne aktivnosti je izvršeno merenjem sposobnosti jedinjenja da hvataju slobodne radikale primenom metode inhibicije pomoću DPPH (1,1difenil-2-pikril-hidrazil) radikala. Sintetisana jedinjenja su okarakterisana temperaturom topljenja, elementalnom analizom i FT-IR spektroskopijom., Six ester and amide derivates of 2,6-dimethyl-4-(substituted)-1,4-dihydropyridine-3,5-dicarboxylic acid have been synthesized in this paper, including: diethyl 2,6-dimethyl-4-phenyl-1,4-dihydropyridine-3,5dicarboxylate, diethyl 2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, diethyl 2,6dimethyl-4-(4-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, diethyl 4-(2-hydroxyphenyl)-2,6dimethyl-1,4-dihydropyridine-3,5-dicarboxylate, diethyl 4-(3-hydroxyphenyl)-2,6-dimethyl-1,4dihydropyridine-3,5-dicarboxylate and diethyl 4-(4-hydroxyphenyl)-2,6-dimethyl-1,4-dihydropyridine-3,5dicarboxylate. Obtained ester derivates were used afterwards as a starting compounds for synthesis of amide derivates, including: 2,6-dimethyl-4-phenyl-N3,N5-di(thiazol-2-yl)-1,4-dihydropyridine-3,5-dicarboxamide, 2,6dimethyl-4-(3-nitrophenyl)-N3,N5-di(thiazol-2-yl)-1,4-dihydropyridine-3,5-dicarboxamide, 2,6-dimethyl-4(4-nitrophenyl)-N3,N5-di(thiazol-2-yl)-1,4-dihydropyridine-3,5-dicarboxamide, 4-(2-hydroxyphenyl)-2,6dimethyl-N3,N5-di(thiazol-2-yl)-1,4-dihydropyridine-3,5-dicarboxamide, 4-(3-hydroxyphenyl)-2,6-dimethylN3,N5-di(thiazol-2-yl)-1,4-dihydropyridine-3,5-dicarboxamide and 4-(4-hydroxyphenyl)-2,6-dimethylN3,N5-di(thiazol-2-yl)-1,4-dihydropyridine-3,5-dicarboxamide. Obtained compounds were characterized by melting point, elementary analysis and FT-IR spectroscopy. In order to determine the effect of the substituent, the antioxidative activity assay of obtained 1,4dihydropyridines was performed by using the DPPH (1,1-diphenyl-2-picryl-hydrazyl) free radical scavenging method.",
publisher = "University of East Sarajevo, Faculty of Technology",
journal = "Journal of Engineering and Processing Management",
title = "Sinteza, karakterizacija i ispitivanje antioksidativne aktivnosti estarskih i amidnih derivata 2,6-dimetil-4-supstituisane-1,4-dihidropiridin-3,5-dikarboksilne kiseline, Synthesis, characterization and antioxidative assay of ester and amide derivates of 2,6-dimethyl-4-(substituted)-1,4dihydropyridine-3,5-dicarboxylic acid",
pages = "15-8",
number = "2",
volume = "10",
doi = "10.7251/JEPM181002008M"
}

Mijatović, T., Perić, M., Matović, L., Ristović, M.,& Drmanić, S.. (2018). Sinteza, karakterizacija i ispitivanje antioksidativne aktivnosti estarskih i amidnih derivata 2,6-dimetil-4-supstituisane-1,4-dihidropiridin-3,5-dikarboksilne kiseline. in Journal of Engineering and Processing Management
University of East Sarajevo, Faculty of Technology., 10(2), 8-15.
https://doi.org/10.7251/JEPM181002008M

Mijatović T, Perić M, Matović L, Ristović M, Drmanić S. Sinteza, karakterizacija i ispitivanje antioksidativne aktivnosti estarskih i amidnih derivata 2,6-dimetil-4-supstituisane-1,4-dihidropiridin-3,5-dikarboksilne kiseline. in Journal of Engineering and Processing Management. 2018;10(2):8-15.
doi:10.7251/JEPM181002008M .

Mijatović, Tamara, Perić, Milica, Matović, Luka, Ristović, Marija, Drmanić, Saša, "Sinteza, karakterizacija i ispitivanje antioksidativne aktivnosti estarskih i amidnih derivata 2,6-dimetil-4-supstituisane-1,4-dihidropiridin-3,5-dikarboksilne kiseline" in Journal of Engineering and Processing Management, 10, no. 2 (2018):8-15,
https://doi.org/10.7251/JEPM181002008M . .

TY  - JOUR
AU  - Čolić, Katarina
AU  - Gubeljak, Nenad
AU  - Burzić, Meri
AU  - Sedmak, Aleksandar
AU  - Mijatović, Tamara
AU  - Milovanović, Aleksa
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2732
AB  - In this paper are presented experimental analyses of the behaviour of 316L stainless steel in regard to fracture, according to standard methods of investigation on modified tensile C(T) specimens. The S316L alloy is selected for this experimental analysis, often used in many engineering applications. This alloy is not prone to corrosion as other austenitic steels with a higher share of carbon. Results show that material behaviour, in terms of dependence of stress intensity factor (SIF) value relative to thickness of the plate, is necessary to assume with a different model when the specimen thickness is very small. Application of standards in the field of investigation of material resistance to fracture allow simultaneous determination and connection of several fracture mechanics parameters.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity and Life
T1  - Analysis of fracture behaviour of thin s316l stainless steel plates
EP  - 216
IS  - 3
SP  - 211
VL  - 17
UR  - https://hdl.handle.net/21.15107/rcub_machinery_2732
ER  - 

@article{
author = "Čolić, Katarina and Gubeljak, Nenad and Burzić, Meri and Sedmak, Aleksandar and Mijatović, Tamara and Milovanović, Aleksa",
year = "2017",
abstract = "In this paper are presented experimental analyses of the behaviour of 316L stainless steel in regard to fracture, according to standard methods of investigation on modified tensile C(T) specimens. The S316L alloy is selected for this experimental analysis, often used in many engineering applications. This alloy is not prone to corrosion as other austenitic steels with a higher share of carbon. Results show that material behaviour, in terms of dependence of stress intensity factor (SIF) value relative to thickness of the plate, is necessary to assume with a different model when the specimen thickness is very small. Application of standards in the field of investigation of material resistance to fracture allow simultaneous determination and connection of several fracture mechanics parameters.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "Analysis of fracture behaviour of thin s316l stainless steel plates",
pages = "216-211",
number = "3",
volume = "17",
url = "https://hdl.handle.net/21.15107/rcub_machinery_2732"
}

Čolić, K., Gubeljak, N., Burzić, M., Sedmak, A., Mijatović, T.,& Milovanović, A.. (2017). Analysis of fracture behaviour of thin s316l stainless steel plates. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 17(3), 211-216.
https://hdl.handle.net/21.15107/rcub_machinery_2732

Čolić K, Gubeljak N, Burzić M, Sedmak A, Mijatović T, Milovanović A. Analysis of fracture behaviour of thin s316l stainless steel plates. in Structural Integrity and Life. 2017;17(3):211-216.
https://hdl.handle.net/21.15107/rcub_machinery_2732 .

Čolić, Katarina, Gubeljak, Nenad, Burzić, Meri, Sedmak, Aleksandar, Mijatović, Tamara, Milovanović, Aleksa, "Analysis of fracture behaviour of thin s316l stainless steel plates" in Structural Integrity and Life, 17, no. 3 (2017):211-216,
https://hdl.handle.net/21.15107/rcub_machinery_2732 .