TY  - JOUR
AU  - Zaidi, Radzeya
AU  - Sedmak, Aleksandar
AU  - Kirin, Snežana
AU  - Grbović, Aleksandar
AU  - Li, Wei
AU  - Lazić-Vulicević, Ljubica
AU  - Šarkočević, Živče
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3395
AB  - Risk assessment procedure based on structural integrity and life estimation has been introduced and applied to oil drilling rig welded pipe. The new concept based on application of structural integrity and life estimation to assess risk level according to probability and consequence of failure was used. Oil drilling rig welded pipe integrity has been assessed by simple application of the Failure Assessment Diagramme (FAD), i.e. by using the ratio of linear elastic fracture mechanics parameter, K-I, and its critical value, K-IC, in relation with the ratio of applied stress and its critical value, to define the point in FAD. Probability of failure is then taken according to the position of the point in the FAD, corresponding to oil drilling rig welded pipe data. Then, the FEM has been applied to calculate more precisely the strain and stress state and to get another, less conservative, risk assessment. Oil drilling rig welded pipe life has been estimated by simple integration of the Paris law, as well as by more complex simulation of fatigue crack growth, using the extended Finite Element Method (xFEM). Probability of failure is then taken as the ratio of the number of cycles for a given crack length and the number of cycles for the critical crack length. These analyses are useful for managers to make decision about further use of damaged pipes, based on data provided by engineers. Also, the procedure introduced here for risk assessment is not limited to oil drilling rig pipes, but it is rather a general one, applicable to any component with known geometry, material properties and loading data.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Failure Analysis
T1  - Risk assessment of oil drilling rig welded pipe based on structural integrity and life estimation
VL  - 112
DO  - 10.1016/j.engfailanal.2020.104508
ER  - 

@article{
author = "Zaidi, Radzeya and Sedmak, Aleksandar and Kirin, Snežana and Grbović, Aleksandar and Li, Wei and Lazić-Vulicević, Ljubica and Šarkočević, Živče",
year = "2020",
abstract = "Risk assessment procedure based on structural integrity and life estimation has been introduced and applied to oil drilling rig welded pipe. The new concept based on application of structural integrity and life estimation to assess risk level according to probability and consequence of failure was used. Oil drilling rig welded pipe integrity has been assessed by simple application of the Failure Assessment Diagramme (FAD), i.e. by using the ratio of linear elastic fracture mechanics parameter, K-I, and its critical value, K-IC, in relation with the ratio of applied stress and its critical value, to define the point in FAD. Probability of failure is then taken according to the position of the point in the FAD, corresponding to oil drilling rig welded pipe data. Then, the FEM has been applied to calculate more precisely the strain and stress state and to get another, less conservative, risk assessment. Oil drilling rig welded pipe life has been estimated by simple integration of the Paris law, as well as by more complex simulation of fatigue crack growth, using the extended Finite Element Method (xFEM). Probability of failure is then taken as the ratio of the number of cycles for a given crack length and the number of cycles for the critical crack length. These analyses are useful for managers to make decision about further use of damaged pipes, based on data provided by engineers. Also, the procedure introduced here for risk assessment is not limited to oil drilling rig pipes, but it is rather a general one, applicable to any component with known geometry, material properties and loading data.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Failure Analysis",
title = "Risk assessment of oil drilling rig welded pipe based on structural integrity and life estimation",
volume = "112",
doi = "10.1016/j.engfailanal.2020.104508"
}

Zaidi, R., Sedmak, A., Kirin, S., Grbović, A., Li, W., Lazić-Vulicević, L.,& Šarkočević, Ž.. (2020). Risk assessment of oil drilling rig welded pipe based on structural integrity and life estimation. in Engineering Failure Analysis
Pergamon-Elsevier Science Ltd, Oxford., 112.
https://doi.org/10.1016/j.engfailanal.2020.104508

Zaidi R, Sedmak A, Kirin S, Grbović A, Li W, Lazić-Vulicević L, Šarkočević Ž. Risk assessment of oil drilling rig welded pipe based on structural integrity and life estimation. in Engineering Failure Analysis. 2020;112.
doi:10.1016/j.engfailanal.2020.104508 .

Zaidi, Radzeya, Sedmak, Aleksandar, Kirin, Snežana, Grbović, Aleksandar, Li, Wei, Lazić-Vulicević, Ljubica, Šarkočević, Živče, "Risk assessment of oil drilling rig welded pipe based on structural integrity and life estimation" in Engineering Failure Analysis, 112 (2020),
https://doi.org/10.1016/j.engfailanal.2020.104508 . .

TY  - CONF
AU  - Kastratović, Gordana
AU  - Vidanović, Nenad
AU  - Grbović, Aleksandar
AU  - Mirkov, Nikola
AU  - Rašuo, Boško
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3323
AB  - This paper discusses certain aspects of numerical simulation of crack propagation in wire ropes subjected to axial loading, with the aim to explore and to demonstrate the capacity, performances and difficulties of crack propagation modeling by usage of numerical computational methods in such complex structures. For this purpose, the finite element method (FEM) was used, and 3D numerical analyses were performed in Ansys Workbench software. In order to validate and verify performed numerical modeling, crack growth rate based on calculated stress intensity factors (SIFs) along the crack fronts was obtained for the model for which experimental results could be found in the available literature. Finally, using the advanced modeling techniques, the parametric 3D model of seven-wire strand was analyzed. Conducted analysis showed that FEM could be a powerful tool for fatigue life predictions in order to reduce the need for experiments, which are still the only successful method for fatigue life estimation of wire ropes.
PB  - Springer International Publishing Ag, Cham
C3  - Computational and Experimental Approaches in Materials Science and Engineering, Cnntech 2019
T1  - Numerical Simulation of Crack Propagation in Seven-Wire Strand
EP  - 91
SP  - 76
VL  - 90
DO  - 10.1007/978-3-030-30853-7_5
ER  - 

@conference{
author = "Kastratović, Gordana and Vidanović, Nenad and Grbović, Aleksandar and Mirkov, Nikola and Rašuo, Boško",
year = "2020",
abstract = "This paper discusses certain aspects of numerical simulation of crack propagation in wire ropes subjected to axial loading, with the aim to explore and to demonstrate the capacity, performances and difficulties of crack propagation modeling by usage of numerical computational methods in such complex structures. For this purpose, the finite element method (FEM) was used, and 3D numerical analyses were performed in Ansys Workbench software. In order to validate and verify performed numerical modeling, crack growth rate based on calculated stress intensity factors (SIFs) along the crack fronts was obtained for the model for which experimental results could be found in the available literature. Finally, using the advanced modeling techniques, the parametric 3D model of seven-wire strand was analyzed. Conducted analysis showed that FEM could be a powerful tool for fatigue life predictions in order to reduce the need for experiments, which are still the only successful method for fatigue life estimation of wire ropes.",
publisher = "Springer International Publishing Ag, Cham",
journal = "Computational and Experimental Approaches in Materials Science and Engineering, Cnntech 2019",
title = "Numerical Simulation of Crack Propagation in Seven-Wire Strand",
pages = "91-76",
volume = "90",
doi = "10.1007/978-3-030-30853-7_5"
}

Kastratović, G., Vidanović, N., Grbović, A., Mirkov, N.,& Rašuo, B.. (2020). Numerical Simulation of Crack Propagation in Seven-Wire Strand. in Computational and Experimental Approaches in Materials Science and Engineering, Cnntech 2019
Springer International Publishing Ag, Cham., 90, 76-91.
https://doi.org/10.1007/978-3-030-30853-7_5

Kastratović G, Vidanović N, Grbović A, Mirkov N, Rašuo B. Numerical Simulation of Crack Propagation in Seven-Wire Strand. in Computational and Experimental Approaches in Materials Science and Engineering, Cnntech 2019. 2020;90:76-91.
doi:10.1007/978-3-030-30853-7_5 .

Kastratović, Gordana, Vidanović, Nenad, Grbović, Aleksandar, Mirkov, Nikola, Rašuo, Boško, "Numerical Simulation of Crack Propagation in Seven-Wire Strand" in Computational and Experimental Approaches in Materials Science and Engineering, Cnntech 2019, 90 (2020):76-91,
https://doi.org/10.1007/978-3-030-30853-7_5 . .

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  - Vidanović, Nenad
AU  - Rašuo, Boško
AU  - Kastratović, Gordana
AU  - Grbović, Aleksandar
AU  - Puharić, Mirjana
AU  - Maksimović, Katarina
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3380
AB  - The main goal of this paper is to expand previously conducted study and consequently to upgrade the proposed multimodular numerical framework developed for fluid-structure interaction simulation (FSI) and multidisciplinary design optimization (MDO) purposes, in a manner that thermal-structure interaction is observed and implemented into the established numerical framework. The upgraded and considerably improved algorithm was used for MDO of the short-range ballistic missile (SRBM) model. Because of its high-speed regimes, this aircraft model was selected for the purpose of numerical modeling and optimization of aerodynamically heated structure. The present study is concerned with a broader observation of critical multipoint flight conditions and represents a more realistic scenario, which indicates this study as one contribution more in a scope of fluid-thermal-structure interaction (FTSI) numerical modeling and optimization. With respect to predefined objectives and constraints, multidisciplinary shape optimization of the fin structure resulted in overall improvement of the missile initial performances. Also, aerothermally induced critical responses of the fin structure were prevented. Numerical modeling of FSI/FTSI and MDO within an industry-accepted design tool resulted in powerful monolithic environment, which, with adopted multipoint regimes and multicriteria settings, was used for aerodynamic-thermal/structural optimization. The obtained results were compared with the results from the previous study conducted without thermal effects.
PB  - Amer Inst Aeronautics  Astronautics, Reston
T2  - Journal of Spacecraft and Rockets
T1  - Multidisciplinary Shape Optimization of Missile Fin Configuration Subject to Aerodynamic Heating
EP  - 527
IS  - 3
SP  - 510
VL  - 57
DO  - 10.2514/1.A34575
ER  - 

@article{
author = "Vidanović, Nenad and Rašuo, Boško and Kastratović, Gordana and Grbović, Aleksandar and Puharić, Mirjana and Maksimović, Katarina",
year = "2020",
abstract = "The main goal of this paper is to expand previously conducted study and consequently to upgrade the proposed multimodular numerical framework developed for fluid-structure interaction simulation (FSI) and multidisciplinary design optimization (MDO) purposes, in a manner that thermal-structure interaction is observed and implemented into the established numerical framework. The upgraded and considerably improved algorithm was used for MDO of the short-range ballistic missile (SRBM) model. Because of its high-speed regimes, this aircraft model was selected for the purpose of numerical modeling and optimization of aerodynamically heated structure. The present study is concerned with a broader observation of critical multipoint flight conditions and represents a more realistic scenario, which indicates this study as one contribution more in a scope of fluid-thermal-structure interaction (FTSI) numerical modeling and optimization. With respect to predefined objectives and constraints, multidisciplinary shape optimization of the fin structure resulted in overall improvement of the missile initial performances. Also, aerothermally induced critical responses of the fin structure were prevented. Numerical modeling of FSI/FTSI and MDO within an industry-accepted design tool resulted in powerful monolithic environment, which, with adopted multipoint regimes and multicriteria settings, was used for aerodynamic-thermal/structural optimization. The obtained results were compared with the results from the previous study conducted without thermal effects.",
publisher = "Amer Inst Aeronautics  Astronautics, Reston",
journal = "Journal of Spacecraft and Rockets",
title = "Multidisciplinary Shape Optimization of Missile Fin Configuration Subject to Aerodynamic Heating",
pages = "527-510",
number = "3",
volume = "57",
doi = "10.2514/1.A34575"
}

Vidanović, N., Rašuo, B., Kastratović, G., Grbović, A., Puharić, M.,& Maksimović, K.. (2020). Multidisciplinary Shape Optimization of Missile Fin Configuration Subject to Aerodynamic Heating. in Journal of Spacecraft and Rockets
Amer Inst Aeronautics  Astronautics, Reston., 57(3), 510-527.
https://doi.org/10.2514/1.A34575

Vidanović N, Rašuo B, Kastratović G, Grbović A, Puharić M, Maksimović K. Multidisciplinary Shape Optimization of Missile Fin Configuration Subject to Aerodynamic Heating. in Journal of Spacecraft and Rockets. 2020;57(3):510-527.
doi:10.2514/1.A34575 .

Vidanović, Nenad, Rašuo, Boško, Kastratović, Gordana, Grbović, Aleksandar, Puharić, Mirjana, Maksimović, Katarina, "Multidisciplinary Shape Optimization of Missile Fin Configuration Subject to Aerodynamic Heating" in Journal of Spacecraft and Rockets, 57, no. 3 (2020):510-527,
https://doi.org/10.2514/1.A34575 . .

TY  - JOUR
AU  - Grbović, Aleksandar
AU  - Kastratović, Gordana
AU  - Sedmak, Aleksandar
AU  - Eldwaib, Khalid
AU  - Kirin, Snežana
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3107
AB  - Shape optimisation is a nowadays-standard requirement in the design of lightweight structural components. In this paper, optimisation of I-beam cross-section of integral aluminium 2024-T3 wing spar is presented, taking the maximum fatigue life as the criterion. Toward this aim, the extended finite element method (XFEM) was used to simulate crack growth in complex I-beam geometry. The computations were carried out using Morfeo/Crack add-on based on XFEM implementation in Abaqus software. Fatigue lives of wing spars with different sizes of cross section but constant area were compared. Conducted analysis has shown that XFEM seems to be efficient tool for complex three-dimensional configurations optimisation.
PB  - Elsevier Sci Ltd, Oxford
T2  - International Journal of Fatigue
T1  - Determination of optimum wing spar cross section for maximum fatigue life
EP  - 311
SP  - 305
VL  - 127
DO  - 10.1016/j.ijfatigue.2019.06.019
ER  - 

@article{
author = "Grbović, Aleksandar and Kastratović, Gordana and Sedmak, Aleksandar and Eldwaib, Khalid and Kirin, Snežana",
year = "2019",
abstract = "Shape optimisation is a nowadays-standard requirement in the design of lightweight structural components. In this paper, optimisation of I-beam cross-section of integral aluminium 2024-T3 wing spar is presented, taking the maximum fatigue life as the criterion. Toward this aim, the extended finite element method (XFEM) was used to simulate crack growth in complex I-beam geometry. The computations were carried out using Morfeo/Crack add-on based on XFEM implementation in Abaqus software. Fatigue lives of wing spars with different sizes of cross section but constant area were compared. Conducted analysis has shown that XFEM seems to be efficient tool for complex three-dimensional configurations optimisation.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "International Journal of Fatigue",
title = "Determination of optimum wing spar cross section for maximum fatigue life",
pages = "311-305",
volume = "127",
doi = "10.1016/j.ijfatigue.2019.06.019"
}

Grbović, A., Kastratović, G., Sedmak, A., Eldwaib, K.,& Kirin, S.. (2019). Determination of optimum wing spar cross section for maximum fatigue life. in International Journal of Fatigue
Elsevier Sci Ltd, Oxford., 127, 305-311.
https://doi.org/10.1016/j.ijfatigue.2019.06.019

Grbović A, Kastratović G, Sedmak A, Eldwaib K, Kirin S. Determination of optimum wing spar cross section for maximum fatigue life. in International Journal of Fatigue. 2019;127:305-311.
doi:10.1016/j.ijfatigue.2019.06.019 .

Grbović, Aleksandar, Kastratović, Gordana, Sedmak, Aleksandar, Eldwaib, Khalid, Kirin, Snežana, "Determination of optimum wing spar cross section for maximum fatigue life" in International Journal of Fatigue, 127 (2019):305-311,
https://doi.org/10.1016/j.ijfatigue.2019.06.019 . .

TY  - CONF
AU  - Camagić, Ivica
AU  - Kirin, Snežana
AU  - Sedmak, Aleksandar
AU  - Burzić, Zijah
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3014
AB  - Risk based analysis of temperature and time effects on fracture toughness values is applied to different regions of a welded joint made of low-alloyed Cr-Mo steel A-387 Gr. B, designed for high temperature applications. Heterogeneity of microstructure and properties of welded joint is evaluated by testing standard 3BP specimens with crack tip located at different regions of a joint, including the base metal (BM), weld metal (WM) and heat-affected-zone (HAZ). Experiments were performed both at the room temperature and at design working temperature, 540 rectangle C. Based on these results, fracture toughness values are determined and used for risk based analysis, including risk matrix presentation as the basis for decision making process.
PB  - Elsevier Science Bv, Amsterdam
C3  - Procedia Structural Integrity - 25th International Conference on Fracture and Structural Integrity
T1  - Risk based analysis of temperature and time effects on brittle fracture of A-387 Gr. B welded joint
EP  - 384
SP  - 379
VL  - 18
DO  - 10.1016/j.prostr.2019.08.178
ER  - 

@conference{
author = "Camagić, Ivica and Kirin, Snežana and Sedmak, Aleksandar and Burzić, Zijah",
year = "2019",
abstract = "Risk based analysis of temperature and time effects on fracture toughness values is applied to different regions of a welded joint made of low-alloyed Cr-Mo steel A-387 Gr. B, designed for high temperature applications. Heterogeneity of microstructure and properties of welded joint is evaluated by testing standard 3BP specimens with crack tip located at different regions of a joint, including the base metal (BM), weld metal (WM) and heat-affected-zone (HAZ). Experiments were performed both at the room temperature and at design working temperature, 540 rectangle C. Based on these results, fracture toughness values are determined and used for risk based analysis, including risk matrix presentation as the basis for decision making process.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Procedia Structural Integrity - 25th International Conference on Fracture and Structural Integrity",
title = "Risk based analysis of temperature and time effects on brittle fracture of A-387 Gr. B welded joint",
pages = "384-379",
volume = "18",
doi = "10.1016/j.prostr.2019.08.178"
}

Camagić, I., Kirin, S., Sedmak, A.,& Burzić, Z.. (2019). Risk based analysis of temperature and time effects on brittle fracture of A-387 Gr. B welded joint. in Procedia Structural Integrity - 25th International Conference on Fracture and Structural Integrity
Elsevier Science Bv, Amsterdam., 18, 379-384.
https://doi.org/10.1016/j.prostr.2019.08.178

Camagić I, Kirin S, Sedmak A, Burzić Z. Risk based analysis of temperature and time effects on brittle fracture of A-387 Gr. B welded joint. in Procedia Structural Integrity - 25th International Conference on Fracture and Structural Integrity. 2019;18:379-384.
doi:10.1016/j.prostr.2019.08.178 .

Camagić, Ivica, Kirin, Snežana, Sedmak, Aleksandar, Burzić, Zijah, "Risk based analysis of temperature and time effects on brittle fracture of A-387 Gr. B welded joint" in Procedia Structural Integrity - 25th International Conference on Fracture and Structural Integrity, 18 (2019):379-384,
https://doi.org/10.1016/j.prostr.2019.08.178 . .

TY  - CONF
AU  - Camagić, Ivica
AU  - Burzić, Zijah
AU  - Sedmak, Simon
AU  - Sedmak, Aleksandar
AU  - Lazarević, Dragan
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3022
AB  - Integrity and life assessment of structural elements or structures subjected to variable loads is necessary in order to define the control interval and removal of damages that occurred during exploitation. Integrity and life assessment of a reactor was carried out with the previously performed welding technology qualification for new and exploited parent material sheets, made of Cr-Mo steel A-387 Gr. B, with a thickness 102 mm. Exploited parent material is the part of a reactor mantle which was in exploitation for over 40 years and is in the repair stage, i.e. its mantle is being replaced with the new material. Obtained test results and their analysis should provide a practical contribution to the assessment of exploitation conditions effects on the behaviour of parent material, welded joint components and the pressure vessel (reactor) used for exploitation at elevated temperatures, all for the purpose of integrity and life assessment of the structure, along with the revitalisation and work life extension of process equipment (reactor), made of steel used for exploitation at elevated temperatures.
PB  - Elsevier Science Bv, Amsterdam
C3  - Procedia Structural Integrity - 25th International Conference on Fracture and Structural Integrity
T1  - Integrity and Life Assessment Procedure for a Reactor
EP  - 390
SP  - 385
VL  - 18
DO  - 10.1016/j.prostr.2019.08.179
ER  - 

@conference{
author = "Camagić, Ivica and Burzić, Zijah and Sedmak, Simon and Sedmak, Aleksandar and Lazarević, Dragan",
year = "2019",
abstract = "Integrity and life assessment of structural elements or structures subjected to variable loads is necessary in order to define the control interval and removal of damages that occurred during exploitation. Integrity and life assessment of a reactor was carried out with the previously performed welding technology qualification for new and exploited parent material sheets, made of Cr-Mo steel A-387 Gr. B, with a thickness 102 mm. Exploited parent material is the part of a reactor mantle which was in exploitation for over 40 years and is in the repair stage, i.e. its mantle is being replaced with the new material. Obtained test results and their analysis should provide a practical contribution to the assessment of exploitation conditions effects on the behaviour of parent material, welded joint components and the pressure vessel (reactor) used for exploitation at elevated temperatures, all for the purpose of integrity and life assessment of the structure, along with the revitalisation and work life extension of process equipment (reactor), made of steel used for exploitation at elevated temperatures.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Procedia Structural Integrity - 25th International Conference on Fracture and Structural Integrity",
title = "Integrity and Life Assessment Procedure for a Reactor",
pages = "390-385",
volume = "18",
doi = "10.1016/j.prostr.2019.08.179"
}

Camagić, I., Burzić, Z., Sedmak, S., Sedmak, A.,& Lazarević, D.. (2019). Integrity and Life Assessment Procedure for a Reactor. in Procedia Structural Integrity - 25th International Conference on Fracture and Structural Integrity
Elsevier Science Bv, Amsterdam., 18, 385-390.
https://doi.org/10.1016/j.prostr.2019.08.179

Camagić I, Burzić Z, Sedmak S, Sedmak A, Lazarević D. Integrity and Life Assessment Procedure for a Reactor. in Procedia Structural Integrity - 25th International Conference on Fracture and Structural Integrity. 2019;18:385-390.
doi:10.1016/j.prostr.2019.08.179 .

Camagić, Ivica, Burzić, Zijah, Sedmak, Simon, Sedmak, Aleksandar, Lazarević, Dragan, "Integrity and Life Assessment Procedure for a Reactor" in Procedia Structural Integrity - 25th International Conference on Fracture and Structural Integrity, 18 (2019):385-390,
https://doi.org/10.1016/j.prostr.2019.08.179 . .

TY  - JOUR
AU  - Joksimović, Aleksandra
AU  - Veg, Emil
AU  - Simonović, Vojislav
AU  - Regodić, Mladen
AU  - Šiniković, Goran
AU  - Gubeljak, Nenad
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3093
AB  - 3D modeliranje u SolidWorks-u se predaje na Mašinskom fakultetu Univerziteta u Beogradu (Srbija) više od jedne decenije. Kao i svaka nova veština koju treba savladati, softverski paket SolidWorks zahteva dobro prilagođenu metodologiju podučavanja. Najbolji mogući način podučavanja bio bi individualni mentorski rad. Jedan profesor po studentu, koji bi bio apsolutno fokusiran na završetak zadatka studenta, i pružio najbolje rezultate . Nažalost, zbog nedostatka nastavnog osoblja i velikog broja studenata, ovaj pristup nije moguć. Umesto toga, jedan profesor bi predstavio zadatak iz 3D modeliranja grupi od 80 studenata. Oni bi pratili celokupnu prezentaciju i tek kada se završi celokupna prezentacija, studenti bi se podelili u četiri učionice sa po 20 računara i vežbali predstavljene zadatke. Tokom poslednje decenije primećeno je nekoliko velikih problema u ovim nastavnim metodama. Primenjen je novi pristup nastavi. Ovaj rad predstavlja novu metodologiju nastave i postignute rezultate u poboljšanju nastavnog procesa.
AB  - More than one decade 3D modeling in SolidWorks is taught at the Faculty of Mechanical Engineering at the University of Belgrade (Serbia). As every new skill that has to be mastered, SolidWorks software package demands well-tailored teaching methodology. The best possible way of teaching would be one-on-one tutoring. One teacher per student, who would be absolutely focused on student's task completion, would provide the best results. Unfortunately, due to the lack of teaching staff and vast number of students this approach isn't possible. Instead, one teacher would present the 3D modeling task of interest on the video presenter to a group of 80 students. They would follow the whole presentation and only when the whole presentation ends, students would split into four classrooms with 20 computers each, and practice the presented tasks. During the last decade few major problems in these teaching methods were recognized. A new teaching approach was implemented. This paper presents a novel teaching methodology and achieved results in the teaching process improvement.
PB  - Univerzitet u Beogradu - Mašinski fakultet, Beograd
T2  - FME Transactions
T1  - Implementacija pristupa obrnute učionice u kursu 3D modeliranja
T1  - Implementation of inverted classroom methodology in 3D modeling course
EP  - 315
IS  - 2
SP  - 310
VL  - 47
DO  - 10.5937/fmet1902310J
ER  - 

@article{
author = "Joksimović, Aleksandra and Veg, Emil and Simonović, Vojislav and Regodić, Mladen and Šiniković, Goran and Gubeljak, Nenad",
year = "2019",
abstract = "3D modeliranje u SolidWorks-u se predaje na Mašinskom fakultetu Univerziteta u Beogradu (Srbija) više od jedne decenije. Kao i svaka nova veština koju treba savladati, softverski paket SolidWorks zahteva dobro prilagođenu metodologiju podučavanja. Najbolji mogući način podučavanja bio bi individualni mentorski rad. Jedan profesor po studentu, koji bi bio apsolutno fokusiran na završetak zadatka studenta, i pružio najbolje rezultate . Nažalost, zbog nedostatka nastavnog osoblja i velikog broja studenata, ovaj pristup nije moguć. Umesto toga, jedan profesor bi predstavio zadatak iz 3D modeliranja grupi od 80 studenata. Oni bi pratili celokupnu prezentaciju i tek kada se završi celokupna prezentacija, studenti bi se podelili u četiri učionice sa po 20 računara i vežbali predstavljene zadatke. Tokom poslednje decenije primećeno je nekoliko velikih problema u ovim nastavnim metodama. Primenjen je novi pristup nastavi. Ovaj rad predstavlja novu metodologiju nastave i postignute rezultate u poboljšanju nastavnog procesa., More than one decade 3D modeling in SolidWorks is taught at the Faculty of Mechanical Engineering at the University of Belgrade (Serbia). As every new skill that has to be mastered, SolidWorks software package demands well-tailored teaching methodology. The best possible way of teaching would be one-on-one tutoring. One teacher per student, who would be absolutely focused on student's task completion, would provide the best results. Unfortunately, due to the lack of teaching staff and vast number of students this approach isn't possible. Instead, one teacher would present the 3D modeling task of interest on the video presenter to a group of 80 students. They would follow the whole presentation and only when the whole presentation ends, students would split into four classrooms with 20 computers each, and practice the presented tasks. During the last decade few major problems in these teaching methods were recognized. A new teaching approach was implemented. This paper presents a novel teaching methodology and achieved results in the teaching process improvement.",
publisher = "Univerzitet u Beogradu - Mašinski fakultet, Beograd",
journal = "FME Transactions",
title = "Implementacija pristupa obrnute učionice u kursu 3D modeliranja, Implementation of inverted classroom methodology in 3D modeling course",
pages = "315-310",
number = "2",
volume = "47",
doi = "10.5937/fmet1902310J"
}

Joksimović, A., Veg, E., Simonović, V., Regodić, M., Šiniković, G.,& Gubeljak, N.. (2019). Implementacija pristupa obrnute učionice u kursu 3D modeliranja. in FME Transactions
Univerzitet u Beogradu - Mašinski fakultet, Beograd., 47(2), 310-315.
https://doi.org/10.5937/fmet1902310J

Joksimović A, Veg E, Simonović V, Regodić M, Šiniković G, Gubeljak N. Implementacija pristupa obrnute učionice u kursu 3D modeliranja. in FME Transactions. 2019;47(2):310-315.
doi:10.5937/fmet1902310J .

Joksimović, Aleksandra, Veg, Emil, Simonović, Vojislav, Regodić, Mladen, Šiniković, Goran, Gubeljak, Nenad, "Implementacija pristupa obrnute učionice u kursu 3D modeliranja" in FME Transactions, 47, no. 2 (2019):310-315,
https://doi.org/10.5937/fmet1902310J . .

TY  - JOUR
AU  - Durdević, Đorđe
AU  - Anđelić, Nina
AU  - Milošević-Mitić, Vesna
AU  - Maneski, Taško
AU  - Rakin, Marko
AU  - Đurđević, Andrijana
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3221
AB  - The purpose of this work is to present analytical and numerical determination of equivalent stress and deformation of open section thin-walled U and Z cantilever beams loaded with torsion. This work can be divided into two parts. In the first part of this paper, equivalent stress and deformation are obtained by analytical calculation for encastered model over the whole cross section. In the second part, the finite element method is applied for four different encastered models and the obtained results are compared with the analytical calculation.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity and Life
T1  - Influence of encastering on thin-walled cantilever beams with u and z profiles on the magnitude of equivalent stress and deformation
EP  - 254
IS  - 3
SP  - 251
VL  - 19
UR  - https://hdl.handle.net/21.15107/rcub_technorep_4196
ER  - 

@article{
author = "Durdević, Đorđe and Anđelić, Nina and Milošević-Mitić, Vesna and Maneski, Taško and Rakin, Marko and Đurđević, Andrijana",
year = "2019",
abstract = "The purpose of this work is to present analytical and numerical determination of equivalent stress and deformation of open section thin-walled U and Z cantilever beams loaded with torsion. This work can be divided into two parts. In the first part of this paper, equivalent stress and deformation are obtained by analytical calculation for encastered model over the whole cross section. In the second part, the finite element method is applied for four different encastered models and the obtained results are compared with the analytical calculation.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "Influence of encastering on thin-walled cantilever beams with u and z profiles on the magnitude of equivalent stress and deformation",
pages = "254-251",
number = "3",
volume = "19",
url = "https://hdl.handle.net/21.15107/rcub_technorep_4196"
}

Durdević, Đ., Anđelić, N., Milošević-Mitić, V., Maneski, T., Rakin, M.,& Đurđević, A.. (2019). Influence of encastering on thin-walled cantilever beams with u and z profiles on the magnitude of equivalent stress and deformation. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 19(3), 251-254.
https://hdl.handle.net/21.15107/rcub_technorep_4196

Durdević Đ, Anđelić N, Milošević-Mitić V, Maneski T, Rakin M, Đurđević A. Influence of encastering on thin-walled cantilever beams with u and z profiles on the magnitude of equivalent stress and deformation. in Structural Integrity and Life. 2019;19(3):251-254.
https://hdl.handle.net/21.15107/rcub_technorep_4196 .

Durdević, Đorđe, Anđelić, Nina, Milošević-Mitić, Vesna, Maneski, Taško, Rakin, Marko, Đurđević, Andrijana, "Influence of encastering on thin-walled cantilever beams with u and z profiles on the magnitude of equivalent stress and deformation" in Structural Integrity and Life, 19, no. 3 (2019):251-254,
https://hdl.handle.net/21.15107/rcub_technorep_4196 .

TY  - JOUR
AU  - Durdević, Đorđe
AU  - Anđelić, Nina
AU  - Maneski, Taško
AU  - Milošević-Mitić, Vesna
AU  - Đurđević, Andrijana
AU  - Konjatić, Pejo
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3113
AB  - The present paper describes numerical and experimental methodology for the analysis of stress and deformation state in structural elements with geometrical discontinuities. The research is based on structural elements of the connecting lug type. The stress and deformation state was determined as the contact area size between the axle and the connecting lug was changing. Numerical analysis was conducted by applying the finite element method in a ''KOMIPS'' software package. Experiments were performed at the Laboratory for stress and deformation measurements, Faculty of Mechanical Engineering, University of Belgrade, using ''GOM'' equipment and ''ARAMIS'' software application (DIC). This paper demonstrates how it is possible to anticipate the results by applying FEM. A short review of current research in the field of structural elements with geometrical discontinuities is given within the framework of the paper.
PB  - Univ Osijek, Tech Fac, Slavonski Brod
T2  - Tehnički vjesnik
T1  - Numerical-Experimental Determination of Stress and Deformation State in Connecting Lugs with the Effect of Contact Area Size
EP  - 384
IS  - 2
SP  - 380
VL  - 26
DO  - 10.17559/TV-20180122105145
ER  - 

@article{
author = "Durdević, Đorđe and Anđelić, Nina and Maneski, Taško and Milošević-Mitić, Vesna and Đurđević, Andrijana and Konjatić, Pejo",
year = "2019",
abstract = "The present paper describes numerical and experimental methodology for the analysis of stress and deformation state in structural elements with geometrical discontinuities. The research is based on structural elements of the connecting lug type. The stress and deformation state was determined as the contact area size between the axle and the connecting lug was changing. Numerical analysis was conducted by applying the finite element method in a ''KOMIPS'' software package. Experiments were performed at the Laboratory for stress and deformation measurements, Faculty of Mechanical Engineering, University of Belgrade, using ''GOM'' equipment and ''ARAMIS'' software application (DIC). This paper demonstrates how it is possible to anticipate the results by applying FEM. A short review of current research in the field of structural elements with geometrical discontinuities is given within the framework of the paper.",
publisher = "Univ Osijek, Tech Fac, Slavonski Brod",
journal = "Tehnički vjesnik",
title = "Numerical-Experimental Determination of Stress and Deformation State in Connecting Lugs with the Effect of Contact Area Size",
pages = "384-380",
number = "2",
volume = "26",
doi = "10.17559/TV-20180122105145"
}

Durdević, Đ., Anđelić, N., Maneski, T., Milošević-Mitić, V., Đurđević, A.,& Konjatić, P.. (2019). Numerical-Experimental Determination of Stress and Deformation State in Connecting Lugs with the Effect of Contact Area Size. in Tehnički vjesnik
Univ Osijek, Tech Fac, Slavonski Brod., 26(2), 380-384.
https://doi.org/10.17559/TV-20180122105145

Durdević Đ, Anđelić N, Maneski T, Milošević-Mitić V, Đurđević A, Konjatić P. Numerical-Experimental Determination of Stress and Deformation State in Connecting Lugs with the Effect of Contact Area Size. in Tehnički vjesnik. 2019;26(2):380-384.
doi:10.17559/TV-20180122105145 .

Durdević, Đorđe, Anđelić, Nina, Maneski, Taško, Milošević-Mitić, Vesna, Đurđević, Andrijana, Konjatić, Pejo, "Numerical-Experimental Determination of Stress and Deformation State in Connecting Lugs with the Effect of Contact Area Size" in Tehnički vjesnik, 26, no. 2 (2019):380-384,
https://doi.org/10.17559/TV-20180122105145 . .

TY  - JOUR
AU  - Veljić, Darko
AU  - Rakin, Marko
AU  - Međo, Bojan
AU  - Mrdak, Mihailo
AU  - Sedmak, Aleksandar
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3190
AB  - Friction stir welding is one of the procedures for joining the parts in solid state. Thermo-mechanical simulation of the friction stir welding of high-strength aluminium alloys 2024 T3 and 2024 T351 is considered in this work. Numerical models corresponding to the linear welding stage are developed in Abaqus software package. The material behaviour is modelled by Johnson-Cook law (which relates the yield stress with temperature, strain and strain rate), and the Arbitrary Lagrangian-Eulerian technique is applied. The difference in thermo-mechanical behaviour between the two materials has been analysed and commented. The main quantities which are considered are the temperature in the weld area, plastic strain, as well as the rate of heat generation during the welding process.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Temperature fields in linear stage of friction stir welding effect of different material properties
EP  - 3992
IS  - 6
SP  - 3985
VL  - 23
DO  - 10.2298/TSCI181015264V
ER  - 

@article{
author = "Veljić, Darko and Rakin, Marko and Međo, Bojan and Mrdak, Mihailo and Sedmak, Aleksandar",
year = "2019",
abstract = "Friction stir welding is one of the procedures for joining the parts in solid state. Thermo-mechanical simulation of the friction stir welding of high-strength aluminium alloys 2024 T3 and 2024 T351 is considered in this work. Numerical models corresponding to the linear welding stage are developed in Abaqus software package. The material behaviour is modelled by Johnson-Cook law (which relates the yield stress with temperature, strain and strain rate), and the Arbitrary Lagrangian-Eulerian technique is applied. The difference in thermo-mechanical behaviour between the two materials has been analysed and commented. The main quantities which are considered are the temperature in the weld area, plastic strain, as well as the rate of heat generation during the welding process.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Temperature fields in linear stage of friction stir welding effect of different material properties",
pages = "3992-3985",
number = "6",
volume = "23",
doi = "10.2298/TSCI181015264V"
}

Veljić, D., Rakin, M., Međo, B., Mrdak, M.,& Sedmak, A.. (2019). Temperature fields in linear stage of friction stir welding effect of different material properties. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 23(6), 3985-3992.
https://doi.org/10.2298/TSCI181015264V

Veljić D, Rakin M, Međo B, Mrdak M, Sedmak A. Temperature fields in linear stage of friction stir welding effect of different material properties. in Thermal Science. 2019;23(6):3985-3992.
doi:10.2298/TSCI181015264V .

Veljić, Darko, Rakin, Marko, Međo, Bojan, Mrdak, Mihailo, Sedmak, Aleksandar, "Temperature fields in linear stage of friction stir welding effect of different material properties" in Thermal Science, 23, no. 6 (2019):3985-3992,
https://doi.org/10.2298/TSCI181015264V . .

TY  - JOUR
AU  - Vencl, Aleksandar
AU  - Mrdak, Mihailo
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3066
AB  - The aim of this study was to investigate the thermal cycling behaviour of NiCr-Al-Co-Y2O3 bond coating in thermal barrier coating (TBC) system with ZrO2-MgO as a top coating. The coatings were deposited by atmospheric plasma spraying (APS) on stainless steel X15Cr13 (EN 1.4024) substrate. The used composite powder NiCr-Al-Co-Y2O3 was mechanically cladded, and the steel substrates were preheated to 160-180 degrees C. The thermal cycling performance of the obtained bond coat and the effect of formed complex ceramic oxides of the Al2O3-Y2O3 system were tested by heating to 1200 degrees C and cooling in air to 160-180 degrees C. The number of performed thermal cycles was 7, 32 and 79. The quality of the obtained coating, as well as its thermal cycling behaviour, was assessed through the microstructural analysis, microhardness and tensile bond strength measurements, and change in chemical composition and microhardness. The obtained results showed that the steel substrate, bond coat oxidation and interdiffusion at bond coat/substrate interface have a significant influence on changes in chemical composition and microhardness of the bond coat. The correlation between oxidation behaviour of NiCr-Al-Co-Y2O3 bond coat and number of thermal cycles was also discussed.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Thermal cycling behaviour of plasma sprayed nicr-al-co-y2o3 bond coat in thermal barrier coating system
EP  - S1800
SP  - S1789
VL  - 23
DO  - 10.2298/TSCI180302374V
ER  - 

@article{
author = "Vencl, Aleksandar and Mrdak, Mihailo",
year = "2019",
abstract = "The aim of this study was to investigate the thermal cycling behaviour of NiCr-Al-Co-Y2O3 bond coating in thermal barrier coating (TBC) system with ZrO2-MgO as a top coating. The coatings were deposited by atmospheric plasma spraying (APS) on stainless steel X15Cr13 (EN 1.4024) substrate. The used composite powder NiCr-Al-Co-Y2O3 was mechanically cladded, and the steel substrates were preheated to 160-180 degrees C. The thermal cycling performance of the obtained bond coat and the effect of formed complex ceramic oxides of the Al2O3-Y2O3 system were tested by heating to 1200 degrees C and cooling in air to 160-180 degrees C. The number of performed thermal cycles was 7, 32 and 79. The quality of the obtained coating, as well as its thermal cycling behaviour, was assessed through the microstructural analysis, microhardness and tensile bond strength measurements, and change in chemical composition and microhardness. The obtained results showed that the steel substrate, bond coat oxidation and interdiffusion at bond coat/substrate interface have a significant influence on changes in chemical composition and microhardness of the bond coat. The correlation between oxidation behaviour of NiCr-Al-Co-Y2O3 bond coat and number of thermal cycles was also discussed.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Thermal cycling behaviour of plasma sprayed nicr-al-co-y2o3 bond coat in thermal barrier coating system",
pages = "S1800-S1789",
volume = "23",
doi = "10.2298/TSCI180302374V"
}

Vencl, A.,& Mrdak, M.. (2019). Thermal cycling behaviour of plasma sprayed nicr-al-co-y2o3 bond coat in thermal barrier coating system. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 23, S1789-S1800.
https://doi.org/10.2298/TSCI180302374V

Vencl A, Mrdak M. Thermal cycling behaviour of plasma sprayed nicr-al-co-y2o3 bond coat in thermal barrier coating system. in Thermal Science. 2019;23:S1789-S1800.
doi:10.2298/TSCI180302374V .

Vencl, Aleksandar, Mrdak, Mihailo, "Thermal cycling behaviour of plasma sprayed nicr-al-co-y2o3 bond coat in thermal barrier coating system" in Thermal Science, 23 (2019):S1789-S1800,
https://doi.org/10.2298/TSCI180302374V . .

TY  - JOUR
AU  - Grbović, Aleksandar
AU  - Kastratović, Gordana
AU  - Sedmak, Aleksandar
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3165
AB  - Three different wing spar designs (differential, equivalent integral, and optimized integral) are analysed, in order to establish the optimum one. Numerical analysis was carried out by extended finite element method (XFEM) and verified using the experimental data for differential wing spar, followed by the analysis of both equivalent and optimized integral wing spar. The optimized spar design regarding fatigue life was obtained by analysing three different cross sections of integral wing spar.
PB  - John Wiley and Sons Inc
T2  - Material Design and Processing Communications
T1  - Design aspects of light aircraft wing spar—Differential and integral approach
IS  - 6
VL  - 1
DO  - 10.1002/mdp2.105
ER  - 

@article{
author = "Grbović, Aleksandar and Kastratović, Gordana and Sedmak, Aleksandar",
year = "2019",
abstract = "Three different wing spar designs (differential, equivalent integral, and optimized integral) are analysed, in order to establish the optimum one. Numerical analysis was carried out by extended finite element method (XFEM) and verified using the experimental data for differential wing spar, followed by the analysis of both equivalent and optimized integral wing spar. The optimized spar design regarding fatigue life was obtained by analysing three different cross sections of integral wing spar.",
publisher = "John Wiley and Sons Inc",
journal = "Material Design and Processing Communications",
title = "Design aspects of light aircraft wing spar—Differential and integral approach",
number = "6",
volume = "1",
doi = "10.1002/mdp2.105"
}

Grbović, A., Kastratović, G.,& Sedmak, A.. (2019). Design aspects of light aircraft wing spar—Differential and integral approach. in Material Design and Processing Communications
John Wiley and Sons Inc., 1(6).
https://doi.org/10.1002/mdp2.105

Grbović A, Kastratović G, Sedmak A. Design aspects of light aircraft wing spar—Differential and integral approach. in Material Design and Processing Communications. 2019;1(6).
doi:10.1002/mdp2.105 .

Grbović, Aleksandar, Kastratović, Gordana, Sedmak, Aleksandar, "Design aspects of light aircraft wing spar—Differential and integral approach" in Material Design and Processing Communications, 1, no. 6 (2019),
https://doi.org/10.1002/mdp2.105 . .

TY  - CONF
AU  - Sedmak, Aleksandar
AU  - Čolić, Katarina
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3192
AB  - This paper presents an analysis of Ti alloys used in biomedical applications, such as artificial joint implants and fixation plates, from a fracture mechanics perspective, including fatigue crack initiation and propagation phenomenon. Toward this end experimental and numerical research of mechanical behaviour of fixation plate and hip replacement implant is presented. Experimental analysis was based on standard methods for testing mechanical properties and application of Digital Image Correlation (DIC) technique, while the Finite Element Method (FEM) was used for numerical simulation. Comparison of results indicated a good agreement of experimental and numerical results and reasonable explanation of fixation plate failure. Experimental and numerical research of cracked hip replacement implant is also presented, including fatigue crack propagation, simulated by the Extended FEM (XFEM) using MORFEO postprocessing of ABAQUS stress-strain results. Based on static analysis and fracture toughness properties, the critical crack length was calculated and then used as the final crack length for fatigue life estimation. Toward this end, the Paris law has been used, with coefficients C and m obtained experimentally on RUMUL testing device. The number of cycles needed for failure which has been obtained was in a reasonable agreement with data from case study analysed.
PB  - Elsevier B.V.
C3  - Procedia Structural Integrity
T1  - Fracture and fatigue behaviour of implants made of Ti alloys
EP  - 50
SP  - 45
VL  - 23
DO  - 10.1016/j.prostr.2020.01.061
ER  - 

@conference{
author = "Sedmak, Aleksandar and Čolić, Katarina",
year = "2019",
abstract = "This paper presents an analysis of Ti alloys used in biomedical applications, such as artificial joint implants and fixation plates, from a fracture mechanics perspective, including fatigue crack initiation and propagation phenomenon. Toward this end experimental and numerical research of mechanical behaviour of fixation plate and hip replacement implant is presented. Experimental analysis was based on standard methods for testing mechanical properties and application of Digital Image Correlation (DIC) technique, while the Finite Element Method (FEM) was used for numerical simulation. Comparison of results indicated a good agreement of experimental and numerical results and reasonable explanation of fixation plate failure. Experimental and numerical research of cracked hip replacement implant is also presented, including fatigue crack propagation, simulated by the Extended FEM (XFEM) using MORFEO postprocessing of ABAQUS stress-strain results. Based on static analysis and fracture toughness properties, the critical crack length was calculated and then used as the final crack length for fatigue life estimation. Toward this end, the Paris law has been used, with coefficients C and m obtained experimentally on RUMUL testing device. The number of cycles needed for failure which has been obtained was in a reasonable agreement with data from case study analysed.",
publisher = "Elsevier B.V.",
journal = "Procedia Structural Integrity",
title = "Fracture and fatigue behaviour of implants made of Ti alloys",
pages = "50-45",
volume = "23",
doi = "10.1016/j.prostr.2020.01.061"
}

Sedmak, A.,& Čolić, K.. (2019). Fracture and fatigue behaviour of implants made of Ti alloys. in Procedia Structural Integrity
Elsevier B.V.., 23, 45-50.
https://doi.org/10.1016/j.prostr.2020.01.061

Sedmak A, Čolić K. Fracture and fatigue behaviour of implants made of Ti alloys. in Procedia Structural Integrity. 2019;23:45-50.
doi:10.1016/j.prostr.2020.01.061 .

Sedmak, Aleksandar, Čolić, Katarina, "Fracture and fatigue behaviour of implants made of Ti alloys" in Procedia Structural Integrity, 23 (2019):45-50,
https://doi.org/10.1016/j.prostr.2020.01.061 . .

TY  - JOUR
AU  - Cabrilo, Aleksandar
AU  - Sedmak, Aleksandar
AU  - Burzić, Zijah
AU  - Perković, Srđa
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3076
AB  - The welding process of armor steel is a complex process due to possible welding faults appearing in all zones of weld metal joint in the form of cracks and pores, as results of high percentage of carbon in the base metal. Military armored vehicles, are exposed to dynamic and impact loads. Hence, it is important to know the fracture toughness and fatigue crack propagation in all zones of the weld joint. Fatigue crack propagation testing was made on SEN (B) specimens. Fatigue threshold for weld metal is the lowest Delta Kth = 10.1 MPa*m1/2, and for base metal is the highest Delta Kth = 13.4 MPa*m1/2, while the notch values in HAZ is Delta Kth = 12.6 MPa*m1/2. Due to a significant interest in quantification of material resistance to crack initiation and propagation, the fatigue crack growth rate was measured in the base metal, HAZ and welded metal zone. Accordingly, the most important attention should be paid to the zone of the base metal, while the weld metal and HAZ are safe zones.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Failure Analysis
T1  - Fracture mechanics and fatigue crack propagation in armor steel welds
VL  - 106
DO  - 10.1016/j.engfailanal.2019.104155
ER  - 

@article{
author = "Cabrilo, Aleksandar and Sedmak, Aleksandar and Burzić, Zijah and Perković, Srđa",
year = "2019",
abstract = "The welding process of armor steel is a complex process due to possible welding faults appearing in all zones of weld metal joint in the form of cracks and pores, as results of high percentage of carbon in the base metal. Military armored vehicles, are exposed to dynamic and impact loads. Hence, it is important to know the fracture toughness and fatigue crack propagation in all zones of the weld joint. Fatigue crack propagation testing was made on SEN (B) specimens. Fatigue threshold for weld metal is the lowest Delta Kth = 10.1 MPa*m1/2, and for base metal is the highest Delta Kth = 13.4 MPa*m1/2, while the notch values in HAZ is Delta Kth = 12.6 MPa*m1/2. Due to a significant interest in quantification of material resistance to crack initiation and propagation, the fatigue crack growth rate was measured in the base metal, HAZ and welded metal zone. Accordingly, the most important attention should be paid to the zone of the base metal, while the weld metal and HAZ are safe zones.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Failure Analysis",
title = "Fracture mechanics and fatigue crack propagation in armor steel welds",
volume = "106",
doi = "10.1016/j.engfailanal.2019.104155"
}

Cabrilo, A., Sedmak, A., Burzić, Z.,& Perković, S.. (2019). Fracture mechanics and fatigue crack propagation in armor steel welds. in Engineering Failure Analysis
Pergamon-Elsevier Science Ltd, Oxford., 106.
https://doi.org/10.1016/j.engfailanal.2019.104155

Cabrilo A, Sedmak A, Burzić Z, Perković S. Fracture mechanics and fatigue crack propagation in armor steel welds. in Engineering Failure Analysis. 2019;106.
doi:10.1016/j.engfailanal.2019.104155 .

Cabrilo, Aleksandar, Sedmak, Aleksandar, Burzić, Zijah, Perković, Srđa, "Fracture mechanics and fatigue crack propagation in armor steel welds" in Engineering Failure Analysis, 106 (2019),
https://doi.org/10.1016/j.engfailanal.2019.104155 . .

TY  - JOUR
AU  - Musrati, Walid
AU  - Međo, Bojan
AU  - Gubeljak, Nenad
AU  - Stefane, Primoz
AU  - Veljić, Darko
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3030
AB  - The topic of this work is analysis of fracture behaviour and resistance of the thin-walled seamless and seam steel pipes, through application of the recently proposed ring-shaped specimen (PRNB - Pipe Ring Notched Bend). The main loading of these pipes in exploitation is internal pressure, which is why axial defects present a significant threat to their integrity and work safety. The ring-shaped specimen geometry is fairly simple to fabricate from a new or exploited pipeline and the specimens have the same thermo-mechanical treatment, assembly conditions, etc. as the actual structure. Experimental-numerical procedure is applied for prediction of the fracture behaviour; this included material characterisation, testing of ring specimens by bending, as well as micromechanical analysis of ductile fracture. In experimental testing, the deformation of the specimens is monitored by using the stereometric measurement system. Numerical analysis is performed in software package Simulia Abaqus, including the application of the micromechanical Complete Gurson model (CGM). The results obtained in this study, along with some previously published results, lead to conclusion that PRNB specimen is a good option for testing of fracture resistance of cylindrical elements such as pipes.
PB  - Elsevier, Amsterdam
T2  - Theoretical and Applied Fracture Mechanics
T1  - Fracture assessment of seam and seamless steel pipes by application of the ring-shaped bending specimens
VL  - 103
DO  - 10.1016/j.tafmec.2019.102302
ER  - 

@article{
author = "Musrati, Walid and Međo, Bojan and Gubeljak, Nenad and Stefane, Primoz and Veljić, Darko and Sedmak, Aleksandar and Rakin, Marko",
year = "2019",
abstract = "The topic of this work is analysis of fracture behaviour and resistance of the thin-walled seamless and seam steel pipes, through application of the recently proposed ring-shaped specimen (PRNB - Pipe Ring Notched Bend). The main loading of these pipes in exploitation is internal pressure, which is why axial defects present a significant threat to their integrity and work safety. The ring-shaped specimen geometry is fairly simple to fabricate from a new or exploited pipeline and the specimens have the same thermo-mechanical treatment, assembly conditions, etc. as the actual structure. Experimental-numerical procedure is applied for prediction of the fracture behaviour; this included material characterisation, testing of ring specimens by bending, as well as micromechanical analysis of ductile fracture. In experimental testing, the deformation of the specimens is monitored by using the stereometric measurement system. Numerical analysis is performed in software package Simulia Abaqus, including the application of the micromechanical Complete Gurson model (CGM). The results obtained in this study, along with some previously published results, lead to conclusion that PRNB specimen is a good option for testing of fracture resistance of cylindrical elements such as pipes.",
publisher = "Elsevier, Amsterdam",
journal = "Theoretical and Applied Fracture Mechanics",
title = "Fracture assessment of seam and seamless steel pipes by application of the ring-shaped bending specimens",
volume = "103",
doi = "10.1016/j.tafmec.2019.102302"
}

Musrati, W., Međo, B., Gubeljak, N., Stefane, P., Veljić, D., Sedmak, A.,& Rakin, M.. (2019). Fracture assessment of seam and seamless steel pipes by application of the ring-shaped bending specimens. in Theoretical and Applied Fracture Mechanics
Elsevier, Amsterdam., 103.
https://doi.org/10.1016/j.tafmec.2019.102302

Musrati W, Međo B, Gubeljak N, Stefane P, Veljić D, Sedmak A, Rakin M. Fracture assessment of seam and seamless steel pipes by application of the ring-shaped bending specimens. in Theoretical and Applied Fracture Mechanics. 2019;103.
doi:10.1016/j.tafmec.2019.102302 .

Musrati, Walid, Međo, Bojan, Gubeljak, Nenad, Stefane, Primoz, Veljić, Darko, Sedmak, Aleksandar, Rakin, Marko, "Fracture assessment of seam and seamless steel pipes by application of the ring-shaped bending specimens" in Theoretical and Applied Fracture Mechanics, 103 (2019),
https://doi.org/10.1016/j.tafmec.2019.102302 . .

TY  - CONF
AU  - Doncheva, Elisaveta
AU  - Međo, Bojan
AU  - Rakin, Marko
AU  - Sedmak, Simon
AU  - Trajanoska, Bojana
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2942
AB  - The industrial application of high-strength low-alloyed steel (HSLA) in welded structures has increased the demand for understanding fracture behavior and structural integrity assessment of this type of steel and produced welded joints. The aim of this paper is to simulate the experimental evaluation of the fracture mechanics specimens by using the micromechanical model. The investigation is performed on two standard single edge notch bend (SENB) specimens with imposed crack in the central region. Numerical analysis was carried out by using Simulia Abaqus software package on 2D models used to simulate the damage development on the local level. The comparison between numerical and experimental results is presented through measured values of J-integral, load-line displacement vu and crack growth resistance (J-Aa) curves. This paper shows that numerical simulations are promising in respect to their accuracy. The application of this model enables to decrease the amount of expensive experiments for determination of the load level that causes crack propagation.
PB  - Elsevier Science Bv, Amsterdam
C3  - Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity
T1  - Numerical simulation of crack propagation in high-strength low-alloyed welded steel
EP  - 488
SP  - 483
VL  - 13
DO  - 10.1016/j.prostr.2018.12.080
ER  - 

@conference{
author = "Doncheva, Elisaveta and Međo, Bojan and Rakin, Marko and Sedmak, Simon and Trajanoska, Bojana",
year = "2018",
abstract = "The industrial application of high-strength low-alloyed steel (HSLA) in welded structures has increased the demand for understanding fracture behavior and structural integrity assessment of this type of steel and produced welded joints. The aim of this paper is to simulate the experimental evaluation of the fracture mechanics specimens by using the micromechanical model. The investigation is performed on two standard single edge notch bend (SENB) specimens with imposed crack in the central region. Numerical analysis was carried out by using Simulia Abaqus software package on 2D models used to simulate the damage development on the local level. The comparison between numerical and experimental results is presented through measured values of J-integral, load-line displacement vu and crack growth resistance (J-Aa) curves. This paper shows that numerical simulations are promising in respect to their accuracy. The application of this model enables to decrease the amount of expensive experiments for determination of the load level that causes crack propagation.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity",
title = "Numerical simulation of crack propagation in high-strength low-alloyed welded steel",
pages = "488-483",
volume = "13",
doi = "10.1016/j.prostr.2018.12.080"
}

Doncheva, E., Međo, B., Rakin, M., Sedmak, S.,& Trajanoska, B.. (2018). Numerical simulation of crack propagation in high-strength low-alloyed welded steel. in Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity
Elsevier Science Bv, Amsterdam., 13, 483-488.
https://doi.org/10.1016/j.prostr.2018.12.080

Doncheva E, Međo B, Rakin M, Sedmak S, Trajanoska B. Numerical simulation of crack propagation in high-strength low-alloyed welded steel. in Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity. 2018;13:483-488.
doi:10.1016/j.prostr.2018.12.080 .

Doncheva, Elisaveta, Međo, Bojan, Rakin, Marko, Sedmak, Simon, Trajanoska, Bojana, "Numerical simulation of crack propagation in high-strength low-alloyed welded steel" in Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity, 13 (2018):483-488,
https://doi.org/10.1016/j.prostr.2018.12.080 . .

TY  - CONF
AU  - Džindo, Emina
AU  - Sedmak, Simon
AU  - Radaković, Zoran
AU  - Cvetković, Ivana
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2813
AB  - The ovennatching can affect the occurrence of cold cracks after welding in high-strength low-alloyed steels of 770 MPa yield strength class. The welding consumable has been designed in a way to produce WM with slightly lower strength properties compared to BM (undennatching effect). The application of high-strength low-alloyed steel SUMIITEN 80P, required a large scope of testing for estimation of behavior of welded joints under different loading conditions, in order to give the reliable estimation of penstock safety.
PB  - Elsevier Science Bv, Amsterdam
C3  - Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity
T1  - Crack growth resistance of weldment constituents
EP  - 423
SP  - 420
VL  - 13
DO  - 10.1016/j.prostr.2018.12.070
ER  - 

@conference{
author = "Džindo, Emina and Sedmak, Simon and Radaković, Zoran and Cvetković, Ivana",
year = "2018",
abstract = "The ovennatching can affect the occurrence of cold cracks after welding in high-strength low-alloyed steels of 770 MPa yield strength class. The welding consumable has been designed in a way to produce WM with slightly lower strength properties compared to BM (undennatching effect). The application of high-strength low-alloyed steel SUMIITEN 80P, required a large scope of testing for estimation of behavior of welded joints under different loading conditions, in order to give the reliable estimation of penstock safety.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity",
title = "Crack growth resistance of weldment constituents",
pages = "423-420",
volume = "13",
doi = "10.1016/j.prostr.2018.12.070"
}

Džindo, E., Sedmak, S., Radaković, Z.,& Cvetković, I.. (2018). Crack growth resistance of weldment constituents. in Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity
Elsevier Science Bv, Amsterdam., 13, 420-423.
https://doi.org/10.1016/j.prostr.2018.12.070

Džindo E, Sedmak S, Radaković Z, Cvetković I. Crack growth resistance of weldment constituents. in Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity. 2018;13:420-423.
doi:10.1016/j.prostr.2018.12.070 .

Džindo, Emina, Sedmak, Simon, Radaković, Zoran, Cvetković, Ivana, "Crack growth resistance of weldment constituents" in Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity, 13 (2018):420-423,
https://doi.org/10.1016/j.prostr.2018.12.070 . .

TY  - CONF
AU  - Durdević, Đorđe
AU  - Anđelić, Nina
AU  - Maneski, Taško
AU  - Milošević-Mitić, Vesna
AU  - Petrović, Ana
AU  - Đurđević, Andrijana
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2811
AB  - The present paper describes numerical and experimental methodology and development of the model for stress and deformation state analysis of the connecting lug of container terminals. Numerical analysis was conducted by applying the finite element method in a "KOMI'S" software package. Experiments were performed at the Laboratory for stress and deformation measurements, Faculty of Mechanical Engineering, Belgrade University, using "GOM" equipment and "ARAMS" software application. This paper demonstrates how it is possible to anticipate the results by applying FEM. This paper will present how experimental results can be predicted using the finite element method. The paper presents an overview of the existing research and review of previous results achieved in this field. Container terminal used to supply electrical energy and management system of conveyor belts that are used in the exploitation of the mining basins. Stress and deformation state analysis of the connecting lugs is carried out at the loading of the container.
PB  - Elsevier Science Bv, Amsterdam
C3  - Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity
T1  - Development of numerical-experimental model of connecting lugs and application on the lugs calculation of container terminals
EP  - 1681
SP  - 1676
VL  - 13
DO  - 10.1016/j.prostr.2018.12.350
ER  - 

@conference{
author = "Durdević, Đorđe and Anđelić, Nina and Maneski, Taško and Milošević-Mitić, Vesna and Petrović, Ana and Đurđević, Andrijana",
year = "2018",
abstract = "The present paper describes numerical and experimental methodology and development of the model for stress and deformation state analysis of the connecting lug of container terminals. Numerical analysis was conducted by applying the finite element method in a "KOMI'S" software package. Experiments were performed at the Laboratory for stress and deformation measurements, Faculty of Mechanical Engineering, Belgrade University, using "GOM" equipment and "ARAMS" software application. This paper demonstrates how it is possible to anticipate the results by applying FEM. This paper will present how experimental results can be predicted using the finite element method. The paper presents an overview of the existing research and review of previous results achieved in this field. Container terminal used to supply electrical energy and management system of conveyor belts that are used in the exploitation of the mining basins. Stress and deformation state analysis of the connecting lugs is carried out at the loading of the container.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity",
title = "Development of numerical-experimental model of connecting lugs and application on the lugs calculation of container terminals",
pages = "1681-1676",
volume = "13",
doi = "10.1016/j.prostr.2018.12.350"
}

Durdević, Đ., Anđelić, N., Maneski, T., Milošević-Mitić, V., Petrović, A.,& Đurđević, A.. (2018). Development of numerical-experimental model of connecting lugs and application on the lugs calculation of container terminals. in Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity
Elsevier Science Bv, Amsterdam., 13, 1676-1681.
https://doi.org/10.1016/j.prostr.2018.12.350

Durdević Đ, Anđelić N, Maneski T, Milošević-Mitić V, Petrović A, Đurđević A. Development of numerical-experimental model of connecting lugs and application on the lugs calculation of container terminals. in Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity. 2018;13:1676-1681.
doi:10.1016/j.prostr.2018.12.350 .

Durdević, Đorđe, Anđelić, Nina, Maneski, Taško, Milošević-Mitić, Vesna, Petrović, Ana, Đurđević, Andrijana, "Development of numerical-experimental model of connecting lugs and application on the lugs calculation of container terminals" in Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity, 13 (2018):1676-1681,
https://doi.org/10.1016/j.prostr.2018.12.350 . .

TY  - CONF
AU  - Veg, Emil
AU  - Sedmak, Aleksandar
AU  - Šiniković, Goran
AU  - Regodić, Mladen
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2831
AB  - Early researches on steel structures integrity were mainly oriented on calculations and conventional experiments. Robust numerical methods of a high accuracy are usually less reliable in estimation of dynamic properties and a true condition of a steel structure. On the other hand, experiments on real structures, being in regular operation, could be very demanding to conduct. Therefore, the implementation and justification of novel methodology in structural integrity analysis is presented here. The main idea is to correlate experimental results with those obtained applying ANSYS software package. Throughout a results cross-correlation and model adjustment the new presentation of the structure is created, involving natural frequency, modal mass, stiffness and damping. By a proper definition of those parameters, and a 3D model of the structure, a preliminary map of measuring points and measuring configuration are set in order to enable structural integrity assessment. Example of application of this procedure is given.
PB  - Elsevier Science Bv, Amsterdam
C3  - Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity
T1  - Structural Integrity Assessment by Using Cross-Correlated Modal Identification
EP  - 2248
SP  - 2245
VL  - 13
DO  - 10.1016/j.prostr.2018.12.133
ER  - 

@conference{
author = "Veg, Emil and Sedmak, Aleksandar and Šiniković, Goran and Regodić, Mladen",
year = "2018",
abstract = "Early researches on steel structures integrity were mainly oriented on calculations and conventional experiments. Robust numerical methods of a high accuracy are usually less reliable in estimation of dynamic properties and a true condition of a steel structure. On the other hand, experiments on real structures, being in regular operation, could be very demanding to conduct. Therefore, the implementation and justification of novel methodology in structural integrity analysis is presented here. The main idea is to correlate experimental results with those obtained applying ANSYS software package. Throughout a results cross-correlation and model adjustment the new presentation of the structure is created, involving natural frequency, modal mass, stiffness and damping. By a proper definition of those parameters, and a 3D model of the structure, a preliminary map of measuring points and measuring configuration are set in order to enable structural integrity assessment. Example of application of this procedure is given.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity",
title = "Structural Integrity Assessment by Using Cross-Correlated Modal Identification",
pages = "2248-2245",
volume = "13",
doi = "10.1016/j.prostr.2018.12.133"
}

Veg, E., Sedmak, A., Šiniković, G.,& Regodić, M.. (2018). Structural Integrity Assessment by Using Cross-Correlated Modal Identification. in Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity
Elsevier Science Bv, Amsterdam., 13, 2245-2248.
https://doi.org/10.1016/j.prostr.2018.12.133

Veg E, Sedmak A, Šiniković G, Regodić M. Structural Integrity Assessment by Using Cross-Correlated Modal Identification. in Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity. 2018;13:2245-2248.
doi:10.1016/j.prostr.2018.12.133 .

Veg, Emil, Sedmak, Aleksandar, Šiniković, Goran, Regodić, Mladen, "Structural Integrity Assessment by Using Cross-Correlated Modal Identification" in Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity, 13 (2018):2245-2248,
https://doi.org/10.1016/j.prostr.2018.12.133 . .

TY  - CONF
AU  - Đurđević, Andrijana
AU  - Sedmak, Aleksandar
AU  - Zivković, Aleksandar
AU  - Durdević, Đorđe
AU  - Marković, Milan
AU  - Milcić, Miodrag
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2810
AB  - The results of research regarding the friction stir welding process of T-joints are presented in this paper. Experimental welding of two and three aluminium plates were performed in order to obtain T-joints. Microhardness measuring and macrostructural examinations of welded T-joints of aluminium alloy are processed. All phases of the welding process are monitored by visual control.
PB  - Elsevier Science Bv, Amsterdam
C3  - Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity
T1  - Microhardness and Macrostructures of Friction Stir Welded T-joints
EP  - 429
SP  - 424
VL  - 13
DO  - 10.1016/j.prostr.2018.12.071
ER  - 

@conference{
author = "Đurđević, Andrijana and Sedmak, Aleksandar and Zivković, Aleksandar and Durdević, Đorđe and Marković, Milan and Milcić, Miodrag",
year = "2018",
abstract = "The results of research regarding the friction stir welding process of T-joints are presented in this paper. Experimental welding of two and three aluminium plates were performed in order to obtain T-joints. Microhardness measuring and macrostructural examinations of welded T-joints of aluminium alloy are processed. All phases of the welding process are monitored by visual control.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity",
title = "Microhardness and Macrostructures of Friction Stir Welded T-joints",
pages = "429-424",
volume = "13",
doi = "10.1016/j.prostr.2018.12.071"
}

Đurđević, A., Sedmak, A., Zivković, A., Durdević, Đ., Marković, M.,& Milcić, M.. (2018). Microhardness and Macrostructures of Friction Stir Welded T-joints. in Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity
Elsevier Science Bv, Amsterdam., 13, 424-429.
https://doi.org/10.1016/j.prostr.2018.12.071

Đurđević A, Sedmak A, Zivković A, Durdević Đ, Marković M, Milcić M. Microhardness and Macrostructures of Friction Stir Welded T-joints. in Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity. 2018;13:424-429.
doi:10.1016/j.prostr.2018.12.071 .

Đurđević, Andrijana, Sedmak, Aleksandar, Zivković, Aleksandar, Durdević, Đorđe, Marković, Milan, Milcić, Miodrag, "Microhardness and Macrostructures of Friction Stir Welded T-joints" in Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity, 13 (2018):424-429,
https://doi.org/10.1016/j.prostr.2018.12.071 . .

TY  - CONF
AU  - Musrati, Walid
AU  - Međo, Bojan
AU  - Gubeljak, Nenad
AU  - Stefane, Primoz
AU  - Veljić, Darko
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2892
AB  - Application of pipelines is common in process industry and energetic facilities, as parts of storage and transport systems. Structural integrity and fracture resistance of the pipeline elements is typically assessed by testing fracture mechanics specimens, like compact tensile CT or single-edge notched bending, SENB. However, fabrication of these geometries is often not possible for thin-walled pressurized elements, commonly used in structures of process and energetic facilities. Therefore, some proposals for non-standard specimens have been given in the literature, differing by the position of the initial defects, in circumferential or axial direction, and by the degree of complexity of procedures for fabrication and testing. Recently proposed ring-shaped specimen (PRNB - Pipe Ring Notched Bend) is used here to assess the fracture resistance of pressurized cylinders with defects in axial direction, critical for the internal pressure loading. The specimens are simple to fabricate and have the same material history as the actual structure, such as thermo-mechanical treatment, assembly or exploitation conditions. In this work, the ring specimens are cut from the thin-walled non-alloy steel pipes for pressure purposes. Experimental-numerical procedure is applied for prediction of fracture behavior. The methods include material characterization, fracture testing and micromechanical analysis of specimen failure. The results obtained so far lead to conclusion that PRNB specimen is a good option for testing of fracture resistance of pipelines and small-scale vessels.
PB  - Elsevier Science Bv, Amsterdam
C3  - Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity
T1  - Fracture analysis of axially flawed ring-shaped bending specimen
EP  - 1833
SP  - 1828
VL  - 13
DO  - 10.1016/j.prostr.2018.12.333
ER  - 

@conference{
author = "Musrati, Walid and Međo, Bojan and Gubeljak, Nenad and Stefane, Primoz and Veljić, Darko and Sedmak, Aleksandar and Rakin, Marko",
year = "2018",
abstract = "Application of pipelines is common in process industry and energetic facilities, as parts of storage and transport systems. Structural integrity and fracture resistance of the pipeline elements is typically assessed by testing fracture mechanics specimens, like compact tensile CT or single-edge notched bending, SENB. However, fabrication of these geometries is often not possible for thin-walled pressurized elements, commonly used in structures of process and energetic facilities. Therefore, some proposals for non-standard specimens have been given in the literature, differing by the position of the initial defects, in circumferential or axial direction, and by the degree of complexity of procedures for fabrication and testing. Recently proposed ring-shaped specimen (PRNB - Pipe Ring Notched Bend) is used here to assess the fracture resistance of pressurized cylinders with defects in axial direction, critical for the internal pressure loading. The specimens are simple to fabricate and have the same material history as the actual structure, such as thermo-mechanical treatment, assembly or exploitation conditions. In this work, the ring specimens are cut from the thin-walled non-alloy steel pipes for pressure purposes. Experimental-numerical procedure is applied for prediction of fracture behavior. The methods include material characterization, fracture testing and micromechanical analysis of specimen failure. The results obtained so far lead to conclusion that PRNB specimen is a good option for testing of fracture resistance of pipelines and small-scale vessels.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity",
title = "Fracture analysis of axially flawed ring-shaped bending specimen",
pages = "1833-1828",
volume = "13",
doi = "10.1016/j.prostr.2018.12.333"
}

Musrati, W., Međo, B., Gubeljak, N., Stefane, P., Veljić, D., Sedmak, A.,& Rakin, M.. (2018). Fracture analysis of axially flawed ring-shaped bending specimen. in Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity
Elsevier Science Bv, Amsterdam., 13, 1828-1833.
https://doi.org/10.1016/j.prostr.2018.12.333

Musrati W, Međo B, Gubeljak N, Stefane P, Veljić D, Sedmak A, Rakin M. Fracture analysis of axially flawed ring-shaped bending specimen. in Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity. 2018;13:1828-1833.
doi:10.1016/j.prostr.2018.12.333 .

Musrati, Walid, Međo, Bojan, Gubeljak, Nenad, Stefane, Primoz, Veljić, Darko, Sedmak, Aleksandar, Rakin, Marko, "Fracture analysis of axially flawed ring-shaped bending specimen" in Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity, 13 (2018):1828-1833,
https://doi.org/10.1016/j.prostr.2018.12.333 . .

TY  - JOUR
AU  - Kraedegh, Abubakr
AU  - Li, Wei
AU  - Sedmak, Aleksandar
AU  - Grbović, Aleksandar
AU  - Trišović, Nataša
AU  - Mitrović, Radivoje
AU  - Kirin, Snežana
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2730
AB  - Fatigue crack growth in friction stir welded T joints under three point bending is simulated numerically using the Extended Finite Element Method (XFEM). Three point bending fatigue load stress is applied at the centre of the plate opposite to the initial crack, with a ratio of stress intensity R = 0 and maximum stress. = 10 MPa. The material properties of all welded regions in the joint, made of aluminium alloy A2024-T351, are adopted from available experiments. All fatigue crack propagation and growth including crack front coordinates (x, y, z) and stress intensity factors (KI, KII, KIII and Kef) are extracted from the analysis results.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity and Life
T1  - Simulation of fatigue crack growth in a2024-t351 t-welded joint
EP  - 6
IS  - 1
SP  - 3
VL  - 17
UR  - https://hdl.handle.net/21.15107/rcub_machinery_2730
ER  - 

@article{
author = "Kraedegh, Abubakr and Li, Wei and Sedmak, Aleksandar and Grbović, Aleksandar and Trišović, Nataša and Mitrović, Radivoje and Kirin, Snežana",
year = "2017",
abstract = "Fatigue crack growth in friction stir welded T joints under three point bending is simulated numerically using the Extended Finite Element Method (XFEM). Three point bending fatigue load stress is applied at the centre of the plate opposite to the initial crack, with a ratio of stress intensity R = 0 and maximum stress. = 10 MPa. The material properties of all welded regions in the joint, made of aluminium alloy A2024-T351, are adopted from available experiments. All fatigue crack propagation and growth including crack front coordinates (x, y, z) and stress intensity factors (KI, KII, KIII and Kef) are extracted from the analysis results.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "Simulation of fatigue crack growth in a2024-t351 t-welded joint",
pages = "6-3",
number = "1",
volume = "17",
url = "https://hdl.handle.net/21.15107/rcub_machinery_2730"
}

Kraedegh, A., Li, W., Sedmak, A., Grbović, A., Trišović, N., Mitrović, R.,& Kirin, S.. (2017). Simulation of fatigue crack growth in a2024-t351 t-welded joint. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 17(1), 3-6.
https://hdl.handle.net/21.15107/rcub_machinery_2730

Kraedegh A, Li W, Sedmak A, Grbović A, Trišović N, Mitrović R, Kirin S. Simulation of fatigue crack growth in a2024-t351 t-welded joint. in Structural Integrity and Life. 2017;17(1):3-6.
https://hdl.handle.net/21.15107/rcub_machinery_2730 .

Kraedegh, Abubakr, Li, Wei, Sedmak, Aleksandar, Grbović, Aleksandar, Trišović, Nataša, Mitrović, Radivoje, Kirin, Snežana, "Simulation of fatigue crack growth in a2024-t351 t-welded joint" in Structural Integrity and Life, 17, no. 1 (2017):3-6,
https://hdl.handle.net/21.15107/rcub_machinery_2730 .

TY  - JOUR
AU  - Sedmak, Aleksandar
AU  - Swei, M.
AU  - Petrovski, Blagoj
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2526
AB  - The ferritic P22 and bainitic-martenstic P91 steel welded joints operating at elevated temperatures are highly vulnerable to premature failure, because microstructure gradients can lead to cracking in the heat-affected zone, commonly referred to as type IV cracking. Creep crack growth tests have been performed using compact tension specimens made of P91 and P22 weld joints at temperatures of 600 and 550 degrees C, respectively. The creep crack growth characterization through empirical equation of C* was the main fracture parameter for relating behaviour of component's regions. Results have shown that, for a specific value of C* parameter, the weld metal and heat-affected zone had similar crack growth rates, which were about two times faster than base metal rates, because of lower creep strength that leads to a conclusion that the creep cracks will most likely initiate in the heat-affected zone region.
PB  - Wiley, Hoboken
T2  - Fatigue & Fracture of Engineering Materials & Structures
T1  - Creep crack growth properties of P91 and P22 welded joints
EP  - 1275
IS  - 8
SP  - 1267
VL  - 40
DO  - 10.1111/ffe.12628
ER  - 

@article{
author = "Sedmak, Aleksandar and Swei, M. and Petrovski, Blagoj",
year = "2017",
abstract = "The ferritic P22 and bainitic-martenstic P91 steel welded joints operating at elevated temperatures are highly vulnerable to premature failure, because microstructure gradients can lead to cracking in the heat-affected zone, commonly referred to as type IV cracking. Creep crack growth tests have been performed using compact tension specimens made of P91 and P22 weld joints at temperatures of 600 and 550 degrees C, respectively. The creep crack growth characterization through empirical equation of C* was the main fracture parameter for relating behaviour of component's regions. Results have shown that, for a specific value of C* parameter, the weld metal and heat-affected zone had similar crack growth rates, which were about two times faster than base metal rates, because of lower creep strength that leads to a conclusion that the creep cracks will most likely initiate in the heat-affected zone region.",
publisher = "Wiley, Hoboken",
journal = "Fatigue & Fracture of Engineering Materials & Structures",
title = "Creep crack growth properties of P91 and P22 welded joints",
pages = "1275-1267",
number = "8",
volume = "40",
doi = "10.1111/ffe.12628"
}

Sedmak, A., Swei, M.,& Petrovski, B.. (2017). Creep crack growth properties of P91 and P22 welded joints. in Fatigue & Fracture of Engineering Materials & Structures
Wiley, Hoboken., 40(8), 1267-1275.
https://doi.org/10.1111/ffe.12628

Sedmak A, Swei M, Petrovski B. Creep crack growth properties of P91 and P22 welded joints. in Fatigue & Fracture of Engineering Materials & Structures. 2017;40(8):1267-1275.
doi:10.1111/ffe.12628 .

Sedmak, Aleksandar, Swei, M., Petrovski, Blagoj, "Creep crack growth properties of P91 and P22 welded joints" in Fatigue & Fracture of Engineering Materials & Structures, 40, no. 8 (2017):1267-1275,
https://doi.org/10.1111/ffe.12628 . .

TY  - CONF
AU  - Međo, Bojan
AU  - Rakin, Marko
AU  - Gubeljak, Nenad
AU  - Musraty, W.
AU  - Matvienko, Y.
AU  - Milošević, Miloš
AU  - Sedmak, Aleksandar
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2669
AB  - Integrity of cylindrical structures, such as pipes and small-scale pressure vessels, is typically assessed by testing fracture mechanics specimens, like compact tensile CT or single-edge notched bending, SENB. However, their fabrication is mainly not possible for thin-walled pressurised elements, commonly used in structures of process and energetic facilities, such as hydrogen and hydrogen carriers storage and delivery systems. Recently proposed nonstandard ring-shaped specimen is used to test the fracture resistance of pressurised cylinders with defects (cracks or notches) in the most critical direction - axial. Some of the advantages of the pipe-ring notch bend specimen, PRNB, are simple fabrication and same material history as actual exploited structure. A combined experimental-numerical procedure is applied for prediction of fracture behaviour of specimens (applicable to ductile metals, mainly steels and Al alloys), with the aim to further validate the new specimen. The results obtained so far lead to conclusion that PRNB specimen can be applied in integrity assessment of cylindrical structures.
PB  - International Conference on Fracture
C3  - ICF 2017 - 14th International Conference on Fracture
T1  - Numerical analysis of fracture of non-standard ring specimen for examination of axially flawed cylindrical structures
EP  - 220
SP  - 219
VL  - 2
UR  - https://hdl.handle.net/21.15107/rcub_technorep_3483
ER  - 

@conference{
author = "Međo, Bojan and Rakin, Marko and Gubeljak, Nenad and Musraty, W. and Matvienko, Y. and Milošević, Miloš and Sedmak, Aleksandar",
year = "2017",
abstract = "Integrity of cylindrical structures, such as pipes and small-scale pressure vessels, is typically assessed by testing fracture mechanics specimens, like compact tensile CT or single-edge notched bending, SENB. However, their fabrication is mainly not possible for thin-walled pressurised elements, commonly used in structures of process and energetic facilities, such as hydrogen and hydrogen carriers storage and delivery systems. Recently proposed nonstandard ring-shaped specimen is used to test the fracture resistance of pressurised cylinders with defects (cracks or notches) in the most critical direction - axial. Some of the advantages of the pipe-ring notch bend specimen, PRNB, are simple fabrication and same material history as actual exploited structure. A combined experimental-numerical procedure is applied for prediction of fracture behaviour of specimens (applicable to ductile metals, mainly steels and Al alloys), with the aim to further validate the new specimen. The results obtained so far lead to conclusion that PRNB specimen can be applied in integrity assessment of cylindrical structures.",
publisher = "International Conference on Fracture",
journal = "ICF 2017 - 14th International Conference on Fracture",
title = "Numerical analysis of fracture of non-standard ring specimen for examination of axially flawed cylindrical structures",
pages = "220-219",
volume = "2",
url = "https://hdl.handle.net/21.15107/rcub_technorep_3483"
}

Međo, B., Rakin, M., Gubeljak, N., Musraty, W., Matvienko, Y., Milošević, M.,& Sedmak, A.. (2017). Numerical analysis of fracture of non-standard ring specimen for examination of axially flawed cylindrical structures. in ICF 2017 - 14th International Conference on Fracture
International Conference on Fracture., 2, 219-220.
https://hdl.handle.net/21.15107/rcub_technorep_3483

Međo B, Rakin M, Gubeljak N, Musraty W, Matvienko Y, Milošević M, Sedmak A. Numerical analysis of fracture of non-standard ring specimen for examination of axially flawed cylindrical structures. in ICF 2017 - 14th International Conference on Fracture. 2017;2:219-220.
https://hdl.handle.net/21.15107/rcub_technorep_3483 .

Međo, Bojan, Rakin, Marko, Gubeljak, Nenad, Musraty, W., Matvienko, Y., Milošević, Miloš, Sedmak, Aleksandar, "Numerical analysis of fracture of non-standard ring specimen for examination of axially flawed cylindrical structures" in ICF 2017 - 14th International Conference on Fracture, 2 (2017):219-220,
https://hdl.handle.net/21.15107/rcub_technorep_3483 .