TY  - JOUR
AU  - Sedmak, Aleksandar
AU  - Petrovski, Blagoj
AU  - Grbović, Aleksandar
AU  - Sedmak, Simon
AU  - Milošević, Nenad
PY  - 2024
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7778
AB  - Experimental and numerical analysis of crack growth in integral skin-stringer panels, produced by Laser Beam Welding (LBW), was performed in the scope of WELDAIR project and later on. Experiment was performed on full-scale components (four stringers, three welded clips), made of AA 6156 T6. Digital Image Correlation (DIC) was used to measure strains and construct CTOD or J crack resistance curves. It was shown that J vs. Δa can have unusual shape, indicating real component crack resistance instead of critical J value commonly obtained by comparing J-R curves with calculated Crack Driving Forces (CDFs). The applied technique is simple, practical and has no limitation in respect to material and geometry
PB  - Elsevier
T2  - Procedia Structural Integrity
T1  - Crack Resistance of AA6156 Welded Stringer Panels
EP  - 380
SP  - 376
VL  - 54
DO  - 10.1016/j.prostr.2024.01.096
ER  - 

@article{
author = "Sedmak, Aleksandar and Petrovski, Blagoj and Grbović, Aleksandar and Sedmak, Simon and Milošević, Nenad",
year = "2024",
abstract = "Experimental and numerical analysis of crack growth in integral skin-stringer panels, produced by Laser Beam Welding (LBW), was performed in the scope of WELDAIR project and later on. Experiment was performed on full-scale components (four stringers, three welded clips), made of AA 6156 T6. Digital Image Correlation (DIC) was used to measure strains and construct CTOD or J crack resistance curves. It was shown that J vs. Δa can have unusual shape, indicating real component crack resistance instead of critical J value commonly obtained by comparing J-R curves with calculated Crack Driving Forces (CDFs). The applied technique is simple, practical and has no limitation in respect to material and geometry",
publisher = "Elsevier",
journal = "Procedia Structural Integrity",
title = "Crack Resistance of AA6156 Welded Stringer Panels",
pages = "380-376",
volume = "54",
doi = "10.1016/j.prostr.2024.01.096"
}

Sedmak, A., Petrovski, B., Grbović, A., Sedmak, S.,& Milošević, N.. (2024). Crack Resistance of AA6156 Welded Stringer Panels. in Procedia Structural Integrity
Elsevier., 54, 376-380.
https://doi.org/10.1016/j.prostr.2024.01.096

Sedmak A, Petrovski B, Grbović A, Sedmak S, Milošević N. Crack Resistance of AA6156 Welded Stringer Panels. in Procedia Structural Integrity. 2024;54:376-380.
doi:10.1016/j.prostr.2024.01.096 .

Sedmak, Aleksandar, Petrovski, Blagoj, Grbović, Aleksandar, Sedmak, Simon, Milošević, Nenad, "Crack Resistance of AA6156 Welded Stringer Panels" in Procedia Structural Integrity, 54 (2024):376-380,
https://doi.org/10.1016/j.prostr.2024.01.096 . .

TY  - CONF
AU  - Đorđević, Branislav
AU  - Mastilović, Sreten
AU  - Petrovski, Blagoj
AU  - Sedmak, Aleksandar
AU  - Dimić, Aleksandar
PY  - 2023
UR  - http://cnntechno.com/docs/7_CNN_book_of_abstracts.pdf
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7095
AB  - In this paper is presented the 1-point method for material behaviour prediction, in terms of fracture toughness, of the ferritic steel EN 1.6310 in the transition temperature regime (-60°C and -90°C). Experiments were carried out at two different temperatures, representing two studies joined in one. Experimental testing was performed according to ASTM 1820 standard. This 1-point method is based on statistical processing (of 2-parameters Weibull statistics) of obtained experimental results, i.e. scattered J-integral values, of C(T) specimens with different geometries. Fixing value of one Weibull parameter and taking into account size-dependence of second one, fracture probabilities in the function of J-integral for large C(T)100 and C(T)200 were determined based on testing of C(T)50 specimen size. This research pointed out the sensitivty of proposed method on statistical sample size. One of the aims of proposed method was reducing the cost and price of laboratory tests in overall by predicting material behaviour and testing smaller C(T) specimen size. This research represents an upgrade of the Landes and Heerens works, and it is dedicated to their efforts in understanding and characterisation of transition temperature regime of ferritic steels.
PB  - University of Belgrade - Faculty of Mechanical Engineering
C3  - International Conference of Experimental and Numerical Investigations and New Technologies (CNN TECH 2023), 04-07 July 2023, Programme and The Book of Abstracts
T1  - A METHOD FOR FRACTURE PROBABILITY ASSESSMENT IN FUNCTION OF J-INTEGRAL IN TRANSITION TEMPERATURE REGIME OF FERRITIC STEEL
SP  - 21
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7095
ER  - 

@conference{
author = "Đorđević, Branislav and Mastilović, Sreten and Petrovski, Blagoj and Sedmak, Aleksandar and Dimić, Aleksandar",
year = "2023",
abstract = "In this paper is presented the 1-point method for material behaviour prediction, in terms of fracture toughness, of the ferritic steel EN 1.6310 in the transition temperature regime (-60°C and -90°C). Experiments were carried out at two different temperatures, representing two studies joined in one. Experimental testing was performed according to ASTM 1820 standard. This 1-point method is based on statistical processing (of 2-parameters Weibull statistics) of obtained experimental results, i.e. scattered J-integral values, of C(T) specimens with different geometries. Fixing value of one Weibull parameter and taking into account size-dependence of second one, fracture probabilities in the function of J-integral for large C(T)100 and C(T)200 were determined based on testing of C(T)50 specimen size. This research pointed out the sensitivty of proposed method on statistical sample size. One of the aims of proposed method was reducing the cost and price of laboratory tests in overall by predicting material behaviour and testing smaller C(T) specimen size. This research represents an upgrade of the Landes and Heerens works, and it is dedicated to their efforts in understanding and characterisation of transition temperature regime of ferritic steels.",
publisher = "University of Belgrade - Faculty of Mechanical Engineering",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies (CNN TECH 2023), 04-07 July 2023, Programme and The Book of Abstracts",
title = "A METHOD FOR FRACTURE PROBABILITY ASSESSMENT IN FUNCTION OF J-INTEGRAL IN TRANSITION TEMPERATURE REGIME OF FERRITIC STEEL",
pages = "21",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7095"
}

Đorđević, B., Mastilović, S., Petrovski, B., Sedmak, A.,& Dimić, A.. (2023). A METHOD FOR FRACTURE PROBABILITY ASSESSMENT IN FUNCTION OF J-INTEGRAL IN TRANSITION TEMPERATURE REGIME OF FERRITIC STEEL. in International Conference of Experimental and Numerical Investigations and New Technologies (CNN TECH 2023), 04-07 July 2023, Programme and The Book of Abstracts
University of Belgrade - Faculty of Mechanical Engineering., 21.
https://hdl.handle.net/21.15107/rcub_machinery_7095

Đorđević B, Mastilović S, Petrovski B, Sedmak A, Dimić A. A METHOD FOR FRACTURE PROBABILITY ASSESSMENT IN FUNCTION OF J-INTEGRAL IN TRANSITION TEMPERATURE REGIME OF FERRITIC STEEL. in International Conference of Experimental and Numerical Investigations and New Technologies (CNN TECH 2023), 04-07 July 2023, Programme and The Book of Abstracts. 2023;:21.
https://hdl.handle.net/21.15107/rcub_machinery_7095 .

Đorđević, Branislav, Mastilović, Sreten, Petrovski, Blagoj, Sedmak, Aleksandar, Dimić, Aleksandar, "A METHOD FOR FRACTURE PROBABILITY ASSESSMENT IN FUNCTION OF J-INTEGRAL IN TRANSITION TEMPERATURE REGIME OF FERRITIC STEEL" in International Conference of Experimental and Numerical Investigations and New Technologies (CNN TECH 2023), 04-07 July 2023, Programme and The Book of Abstracts (2023):21,
https://hdl.handle.net/21.15107/rcub_machinery_7095 .

TY  - JOUR
AU  - Vučetić, Trivun
AU  - Petrovski, Blagoj
AU  - Marković, Zlatan
AU  - Jeremić, Lazar
AU  - Sedmak, Aleksandar
AU  - Milošević, Nenad
AU  - Milovanović, Nikola
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4279
AB  - Prikazana je popravka posude 970, jer je rizik bio veoma visok, blizu najgoreg slučaja verovatnoće i posledica. Kako položaj greške nije bio pogodan za iskopavanje i reparaturno zavarivanje, odlučeno je da se napravi ukrutni prsten,kako bi se smanjio napon u zavarenom spoju, tako da se i faktor intenziteta napona i neto napon značajno smanjuju.
AB  - The reparation of vessel 970 is shown, since the risk is
very high (close to the worst case of both probability and
consequence, being the highest). Since the defect location
was not suitable for digging out and repair welding, it was
decided to make a circumferential stiffener, to reduce the
stress acting on the welded joint, so that both the stress
intensity factor and net stress are reduced significantly.
PB  - Beograd : DIVK
T2  - Integritet i vek konstrukcija
T1  - Stiffener as a special design solution for pressure vessel repair
EP  - 266
IS  - 3
SP  - 263
VL  - 22
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4279
ER  - 

@article{
author = "Vučetić, Trivun and Petrovski, Blagoj and Marković, Zlatan and Jeremić, Lazar and Sedmak, Aleksandar and Milošević, Nenad and Milovanović, Nikola",
year = "2022",
abstract = "Prikazana je popravka posude 970, jer je rizik bio veoma visok, blizu najgoreg slučaja verovatnoće i posledica. Kako položaj greške nije bio pogodan za iskopavanje i reparaturno zavarivanje, odlučeno je da se napravi ukrutni prsten,kako bi se smanjio napon u zavarenom spoju, tako da se i faktor intenziteta napona i neto napon značajno smanjuju., The reparation of vessel 970 is shown, since the risk is
very high (close to the worst case of both probability and
consequence, being the highest). Since the defect location
was not suitable for digging out and repair welding, it was
decided to make a circumferential stiffener, to reduce the
stress acting on the welded joint, so that both the stress
intensity factor and net stress are reduced significantly.",
publisher = "Beograd : DIVK",
journal = "Integritet i vek konstrukcija",
title = "Stiffener as a special design solution for pressure vessel repair",
pages = "266-263",
number = "3",
volume = "22",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4279"
}

Vučetić, T., Petrovski, B., Marković, Z., Jeremić, L., Sedmak, A., Milošević, N.,& Milovanović, N.. (2022). Stiffener as a special design solution for pressure vessel repair. in Integritet i vek konstrukcija
Beograd : DIVK., 22(3), 263-266.
https://hdl.handle.net/21.15107/rcub_machinery_4279

Vučetić T, Petrovski B, Marković Z, Jeremić L, Sedmak A, Milošević N, Milovanović N. Stiffener as a special design solution for pressure vessel repair. in Integritet i vek konstrukcija. 2022;22(3):263-266.
https://hdl.handle.net/21.15107/rcub_machinery_4279 .

Vučetić, Trivun, Petrovski, Blagoj, Marković, Zlatan, Jeremić, Lazar, Sedmak, Aleksandar, Milošević, Nenad, Milovanović, Nikola, "Stiffener as a special design solution for pressure vessel repair" in Integritet i vek konstrukcija, 22, no. 3 (2022):263-266,
https://hdl.handle.net/21.15107/rcub_machinery_4279 .

TY  - JOUR
AU  - Sedmak, Aleksandar
AU  - Grbović, Aleksandar
AU  - Petrovski, Blagoj
AU  - Sghayer, Abulgasem
AU  - Sedmak, Simon
AU  - Berto, Filippo
AU  - Đurđević, A.
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3813
AB  - Fatigue crack growth in different panels, made of AA6156 T6, was investigated experimentally and numerically. Three different types of panels were used, simple one, so-called base metal (BM), panel with 4 welded stringers and panel with 4 welded stringers and 3 welded clips. Experimental investigation indicated benefits of stringers, especially in respect to residual life, since the number of cycles were more than doubled (420 Kcyc vs 195 Kcyc for initial crack length 14 mm), but that was not the case for panels with clips (220 Kcyc). Experimental investigation was also performed on panels with longer cracks (75 mm) to check the effect of initial crack length in the case of BM and panels with 4 stringers, showing practically the same effect of stringers on residual life (95 Kcyc vs 50 Kcyc). Then, fatigue crack growth in panels was simulated numerically using xFEM. Numerical simulation indicated the same trend and effectiveness of stringers, with sufficient agreement with experimental results for BM and panels with stringers only. Anyhow in the case of clips panels with 4 stringers and 3 clips, number of cycles for panel with additional 3-clips was higher than for panel with just 4-stringer, (278 Kcyc vs 265 Kcyc), improving fatigue life for cca 5 %, contrary to experimental results.
PB  - Elsevier Ltd
T2  - International Journal of Fatigue
T1  - The effects of welded clips on fatigue crack growth in AA6156 T6 panels
VL  - 165
DO  - 10.1016/j.ijfatigue.2022.107162
ER  - 

@article{
author = "Sedmak, Aleksandar and Grbović, Aleksandar and Petrovski, Blagoj and Sghayer, Abulgasem and Sedmak, Simon and Berto, Filippo and Đurđević, A.",
year = "2022",
abstract = "Fatigue crack growth in different panels, made of AA6156 T6, was investigated experimentally and numerically. Three different types of panels were used, simple one, so-called base metal (BM), panel with 4 welded stringers and panel with 4 welded stringers and 3 welded clips. Experimental investigation indicated benefits of stringers, especially in respect to residual life, since the number of cycles were more than doubled (420 Kcyc vs 195 Kcyc for initial crack length 14 mm), but that was not the case for panels with clips (220 Kcyc). Experimental investigation was also performed on panels with longer cracks (75 mm) to check the effect of initial crack length in the case of BM and panels with 4 stringers, showing practically the same effect of stringers on residual life (95 Kcyc vs 50 Kcyc). Then, fatigue crack growth in panels was simulated numerically using xFEM. Numerical simulation indicated the same trend and effectiveness of stringers, with sufficient agreement with experimental results for BM and panels with stringers only. Anyhow in the case of clips panels with 4 stringers and 3 clips, number of cycles for panel with additional 3-clips was higher than for panel with just 4-stringer, (278 Kcyc vs 265 Kcyc), improving fatigue life for cca 5 %, contrary to experimental results.",
publisher = "Elsevier Ltd",
journal = "International Journal of Fatigue",
title = "The effects of welded clips on fatigue crack growth in AA6156 T6 panels",
volume = "165",
doi = "10.1016/j.ijfatigue.2022.107162"
}

Sedmak, A., Grbović, A., Petrovski, B., Sghayer, A., Sedmak, S., Berto, F.,& Đurđević, A.. (2022). The effects of welded clips on fatigue crack growth in AA6156 T6 panels. in International Journal of Fatigue
Elsevier Ltd., 165.
https://doi.org/10.1016/j.ijfatigue.2022.107162

Sedmak A, Grbović A, Petrovski B, Sghayer A, Sedmak S, Berto F, Đurđević A. The effects of welded clips on fatigue crack growth in AA6156 T6 panels. in International Journal of Fatigue. 2022;165.
doi:10.1016/j.ijfatigue.2022.107162 .

Sedmak, Aleksandar, Grbović, Aleksandar, Petrovski, Blagoj, Sghayer, Abulgasem, Sedmak, Simon, Berto, Filippo, Đurđević, A., "The effects of welded clips on fatigue crack growth in AA6156 T6 panels" in International Journal of Fatigue, 165 (2022),
https://doi.org/10.1016/j.ijfatigue.2022.107162 . .

TY  - CONF
AU  - Đorđević, Branislav R.
AU  - Petrovski, Blagoj
AU  - Sedmak, Aleksandar
AU  - Kozak, Dražan
AU  - Samardzić, I.
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3672
AB  - The fracture represents the final phase of crack propagation, and the causes of their occurrence or partial crack propagation in the real constructions made of ferritic steels can be different. Along with cracks, influences such as stress concentration and low temperature contribute to fracture being “faster” and have an impact on the fracture mechanics parameters, as well as on the fact that fracture is more likely to occur due to cleavage. The parameters discussed in this study are Jc and rc (parameter, i.e. distance between fatigue crack tip and cleavage initiation site) by testing of C(T)50 specimen in the transition temperature region. Grooved C(T) specimens were made of reactor steel 20MnMoNi 55 with two thickness values, since an additional goal of this study was to present the influence of thickness of tested specimens. Along with it, other parameters that have influence on the understanding of transition temperature region and fracture in this region of ferritic steel are presented.
PB  - Elsevier B.V.
C3  - Procedia Structural Integrity
T1  - Fracture behavior of reactor steel 20MnMoNi 55 in the transition temperature region
EP  - 787
IS  - C
SP  - 781
VL  - 33
DO  - 10.1016/j.prostr.2021.10.086
ER  - 

@conference{
author = "Đorđević, Branislav R. and Petrovski, Blagoj and Sedmak, Aleksandar and Kozak, Dražan and Samardzić, I.",
year = "2021",
abstract = "The fracture represents the final phase of crack propagation, and the causes of their occurrence or partial crack propagation in the real constructions made of ferritic steels can be different. Along with cracks, influences such as stress concentration and low temperature contribute to fracture being “faster” and have an impact on the fracture mechanics parameters, as well as on the fact that fracture is more likely to occur due to cleavage. The parameters discussed in this study are Jc and rc (parameter, i.e. distance between fatigue crack tip and cleavage initiation site) by testing of C(T)50 specimen in the transition temperature region. Grooved C(T) specimens were made of reactor steel 20MnMoNi 55 with two thickness values, since an additional goal of this study was to present the influence of thickness of tested specimens. Along with it, other parameters that have influence on the understanding of transition temperature region and fracture in this region of ferritic steel are presented.",
publisher = "Elsevier B.V.",
journal = "Procedia Structural Integrity",
title = "Fracture behavior of reactor steel 20MnMoNi 55 in the transition temperature region",
pages = "787-781",
number = "C",
volume = "33",
doi = "10.1016/j.prostr.2021.10.086"
}

Đorđević, B. R., Petrovski, B., Sedmak, A., Kozak, D.,& Samardzić, I.. (2021). Fracture behavior of reactor steel 20MnMoNi 55 in the transition temperature region. in Procedia Structural Integrity
Elsevier B.V.., 33(C), 781-787.
https://doi.org/10.1016/j.prostr.2021.10.086

Đorđević BR, Petrovski B, Sedmak A, Kozak D, Samardzić I. Fracture behavior of reactor steel 20MnMoNi 55 in the transition temperature region. in Procedia Structural Integrity. 2021;33(C):781-787.
doi:10.1016/j.prostr.2021.10.086 .

Đorđević, Branislav R., Petrovski, Blagoj, Sedmak, Aleksandar, Kozak, Dražan, Samardzić, I., "Fracture behavior of reactor steel 20MnMoNi 55 in the transition temperature region" in Procedia Structural Integrity, 33, no. C (2021):781-787,
https://doi.org/10.1016/j.prostr.2021.10.086 . .

TY  - CONF
AU  - Grbović, Aleksandar
AU  - Sedmak, Aleksandar
AU  - Petrovski, Blagoj
AU  - Sghayer, Abulgasem
AU  - Sedmak, Simon
AU  - Razavi, J.
AU  - Berto, Filippo
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3657
AB  - Fatigue crack growth in a panel with 4 stringers and 3-clips, made of AA6156 T6, was modelled numerically using xFEM. The central crack of the length a=17 mm was propagated in the total of 91 steps (in each step crack length increased by 2 mm) and after 14 steps the first clip began to deform. At the same time, crack continued to grow through the base plate, reaching the right and left stringers after 91 steps and beginning to grow along those stringers. Number of cycles for panel with additional 3-clips was higher than for panel with just 4-stringer, (278476 cycles vs. 2649587) cycles, improving fatigue life for cca 5%.
PB  - Elsevier B.V.
C3  - Procedia Structural Integrity
T1  - Numerical simulation of fatigue crack growth in AA6156 T6 panels
EP  - 791
IS  - C
SP  - 786
VL  - 39
DO  - 10.1016/j.prostr.2022.03.155
ER  - 

@conference{
author = "Grbović, Aleksandar and Sedmak, Aleksandar and Petrovski, Blagoj and Sghayer, Abulgasem and Sedmak, Simon and Razavi, J. and Berto, Filippo",
year = "2021",
abstract = "Fatigue crack growth in a panel with 4 stringers and 3-clips, made of AA6156 T6, was modelled numerically using xFEM. The central crack of the length a=17 mm was propagated in the total of 91 steps (in each step crack length increased by 2 mm) and after 14 steps the first clip began to deform. At the same time, crack continued to grow through the base plate, reaching the right and left stringers after 91 steps and beginning to grow along those stringers. Number of cycles for panel with additional 3-clips was higher than for panel with just 4-stringer, (278476 cycles vs. 2649587) cycles, improving fatigue life for cca 5%.",
publisher = "Elsevier B.V.",
journal = "Procedia Structural Integrity",
title = "Numerical simulation of fatigue crack growth in AA6156 T6 panels",
pages = "791-786",
number = "C",
volume = "39",
doi = "10.1016/j.prostr.2022.03.155"
}

Grbović, A., Sedmak, A., Petrovski, B., Sghayer, A., Sedmak, S., Razavi, J.,& Berto, F.. (2021). Numerical simulation of fatigue crack growth in AA6156 T6 panels. in Procedia Structural Integrity
Elsevier B.V.., 39(C), 786-791.
https://doi.org/10.1016/j.prostr.2022.03.155

Grbović A, Sedmak A, Petrovski B, Sghayer A, Sedmak S, Razavi J, Berto F. Numerical simulation of fatigue crack growth in AA6156 T6 panels. in Procedia Structural Integrity. 2021;39(C):786-791.
doi:10.1016/j.prostr.2022.03.155 .

Grbović, Aleksandar, Sedmak, Aleksandar, Petrovski, Blagoj, Sghayer, Abulgasem, Sedmak, Simon, Razavi, J., Berto, Filippo, "Numerical simulation of fatigue crack growth in AA6156 T6 panels" in Procedia Structural Integrity, 39, no. C (2021):786-791,
https://doi.org/10.1016/j.prostr.2022.03.155 . .

TY  - JOUR
AU  - Đorđević, Branislav R.
AU  - Sedmak, Aleksandar
AU  - Petrovski, Blagoj
AU  - Dimić, Aleksandar
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3593
AB  - This paper presents the results and methods used for determining of probability of cleavage fracture toughness of ferritic reactor steel in transition temperature area. The steel tested in this study is steel know as 20MnMoNi 55 by DIN standard, typically used for structures working at low temperatures. In addition, the effect of test specimen geometry, temperature and fatigue crack initiation rate on fracture toughness was investigated in order to predict the fracture behaviour and probability of cleavage fracture. Two main studies joined in on one are presented in this paper. Testing in both studies were performed according to ASTM 1820 standard and the Weibull distribution with regression analysis, which includes fitting the experimental results in a logarithmic coordinate system, was used to predict the Jc values. Cleavage fracture probabilities in the function of Jc for large test specimen, C(T)100 and C(T)200 were determined based on the results obtained by testing of small C(T)50 specimens, for the purpose of direct savings and decreased costs of specimen testing. Cleavage fracture probability, represented by using Weibull distribution of experimental data will provide a clear insight into material behaviour at different temperatures. The influence of Delta K values during fatigue pre-cracking procedure on the fracture toughness scatter was also presented and discussed.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Failure Analysis
T1  - Probability distribution on cleavage fracture in function of Jc for reactor ferritic steel in transition temperature region
VL  - 125
DO  - 10.1016/j.engfailanal.2021.105392
ER  - 

@article{
author = "Đorđević, Branislav R. and Sedmak, Aleksandar and Petrovski, Blagoj and Dimić, Aleksandar",
year = "2021",
abstract = "This paper presents the results and methods used for determining of probability of cleavage fracture toughness of ferritic reactor steel in transition temperature area. The steel tested in this study is steel know as 20MnMoNi 55 by DIN standard, typically used for structures working at low temperatures. In addition, the effect of test specimen geometry, temperature and fatigue crack initiation rate on fracture toughness was investigated in order to predict the fracture behaviour and probability of cleavage fracture. Two main studies joined in on one are presented in this paper. Testing in both studies were performed according to ASTM 1820 standard and the Weibull distribution with regression analysis, which includes fitting the experimental results in a logarithmic coordinate system, was used to predict the Jc values. Cleavage fracture probabilities in the function of Jc for large test specimen, C(T)100 and C(T)200 were determined based on the results obtained by testing of small C(T)50 specimens, for the purpose of direct savings and decreased costs of specimen testing. Cleavage fracture probability, represented by using Weibull distribution of experimental data will provide a clear insight into material behaviour at different temperatures. The influence of Delta K values during fatigue pre-cracking procedure on the fracture toughness scatter was also presented and discussed.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Failure Analysis",
title = "Probability distribution on cleavage fracture in function of Jc for reactor ferritic steel in transition temperature region",
volume = "125",
doi = "10.1016/j.engfailanal.2021.105392"
}

Đorđević, B. R., Sedmak, A., Petrovski, B.,& Dimić, A.. (2021). Probability distribution on cleavage fracture in function of Jc for reactor ferritic steel in transition temperature region. in Engineering Failure Analysis
Pergamon-Elsevier Science Ltd, Oxford., 125.
https://doi.org/10.1016/j.engfailanal.2021.105392

Đorđević BR, Sedmak A, Petrovski B, Dimić A. Probability distribution on cleavage fracture in function of Jc for reactor ferritic steel in transition temperature region. in Engineering Failure Analysis. 2021;125.
doi:10.1016/j.engfailanal.2021.105392 .

Đorđević, Branislav R., Sedmak, Aleksandar, Petrovski, Blagoj, Dimić, Aleksandar, "Probability distribution on cleavage fracture in function of Jc for reactor ferritic steel in transition temperature region" in Engineering Failure Analysis, 125 (2021),
https://doi.org/10.1016/j.engfailanal.2021.105392 . .

TY  - CONF
AU  - Đorđević, Branislav R.
AU  - Sedmak, Aleksandar
AU  - Petrovski, Blagoj
AU  - Dimić, Aleksandar
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3259
AB  - This paper presents the results and methods used for determining of fracture toughness of reactor steel, denoted as 20MnMoNi55, typically used for structures working at low temperatures, in transition temperature area. In addition, the effect of test specimen geometry and temperature on fracture toughness was investigated in order to predict the fracture behavior and probability of failure. Failure probabilities (i.e. cleavage fracture) in the function of J(c) for large test specimens, CT100 and CT200 were determined based on the results obtained by testing of small CT50 specimens, for the purpose of direct savings and decreased costs of specimen testing. Failure probability, represented using Weibull distribution of experimental data, will provide a clear insight into material behavior at different temperatures. Other factors affecting the obtained test results will also be discussed.
PB  - Elsevier, Amsterdam
C3  - Procedia Structural Integrity - 1st Virtual European Conference on Fracture - Vecf1
T1  - Weibull probability distribution for reactor steel 20MnMoNi55 cleavage fracture in transition temperature
EP  - 300
SP  - 295
VL  - 28
DO  - 10.1016/j.prostr.2020.10.035
ER  - 

@conference{
author = "Đorđević, Branislav R. and Sedmak, Aleksandar and Petrovski, Blagoj and Dimić, Aleksandar",
year = "2020",
abstract = "This paper presents the results and methods used for determining of fracture toughness of reactor steel, denoted as 20MnMoNi55, typically used for structures working at low temperatures, in transition temperature area. In addition, the effect of test specimen geometry and temperature on fracture toughness was investigated in order to predict the fracture behavior and probability of failure. Failure probabilities (i.e. cleavage fracture) in the function of J(c) for large test specimens, CT100 and CT200 were determined based on the results obtained by testing of small CT50 specimens, for the purpose of direct savings and decreased costs of specimen testing. Failure probability, represented using Weibull distribution of experimental data, will provide a clear insight into material behavior at different temperatures. Other factors affecting the obtained test results will also be discussed.",
publisher = "Elsevier, Amsterdam",
journal = "Procedia Structural Integrity - 1st Virtual European Conference on Fracture - Vecf1",
title = "Weibull probability distribution for reactor steel 20MnMoNi55 cleavage fracture in transition temperature",
pages = "300-295",
volume = "28",
doi = "10.1016/j.prostr.2020.10.035"
}

Đorđević, B. R., Sedmak, A., Petrovski, B.,& Dimić, A.. (2020). Weibull probability distribution for reactor steel 20MnMoNi55 cleavage fracture in transition temperature. in Procedia Structural Integrity - 1st Virtual European Conference on Fracture - Vecf1
Elsevier, Amsterdam., 28, 295-300.
https://doi.org/10.1016/j.prostr.2020.10.035

Đorđević BR, Sedmak A, Petrovski B, Dimić A. Weibull probability distribution for reactor steel 20MnMoNi55 cleavage fracture in transition temperature. in Procedia Structural Integrity - 1st Virtual European Conference on Fracture - Vecf1. 2020;28:295-300.
doi:10.1016/j.prostr.2020.10.035 .

Đorđević, Branislav R., Sedmak, Aleksandar, Petrovski, Blagoj, Dimić, Aleksandar, "Weibull probability distribution for reactor steel 20MnMoNi55 cleavage fracture in transition temperature" in Procedia Structural Integrity - 1st Virtual European Conference on Fracture - Vecf1, 28 (2020):295-300,
https://doi.org/10.1016/j.prostr.2020.10.035 . .

TY  - JOUR
AU  - Đorđević, Branislav R.
AU  - Sedmak, Aleksandar
AU  - Petrovski, Blagoj
AU  - Sedmak, Simon
AU  - Radaković, Zoran
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3440
AB  - It is known that the load level, the way deformation is applied and the level of plastic strain, all can 'aid' or 'hinder' the occurrence of brittle fracture, but the question is - to what extent? These influential factors are analysed by testing of C(T)50 specimens made of ferritic steel 20MnMoNi 55 at two temperatures within the transition temperature range. The effect of displacement rates is analysed by testing C(T) specimens at -60 degrees C, while the effect of plastic strain is analysed by introducing an initial fatigue crack with low and high stress intensity factor threshold values of Delta K, by testing the C(T) specimens at -90 degrees C, in accordance with ASTM 1820 standard. The analysis of these influences involves interpretation of test results for parameters J(c), CMOD, and r(c). Conclusions based on this analysis can be used in further studies which involve understanding of ductile to brittle transition region, as well as the general fracture behaviour of ferritic steels.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity and Life
T1  - Load and deformation effects on brittle fracture of ferritic steel 20МnМoНi 55 in temperature transition region
EP  - 189
IS  - 2
SP  - 184
VL  - 20
UR  - https://hdl.handle.net/21.15107/rcub_machinery_3440
ER  - 

@article{
author = "Đorđević, Branislav R. and Sedmak, Aleksandar and Petrovski, Blagoj and Sedmak, Simon and Radaković, Zoran",
year = "2020",
abstract = "It is known that the load level, the way deformation is applied and the level of plastic strain, all can 'aid' or 'hinder' the occurrence of brittle fracture, but the question is - to what extent? These influential factors are analysed by testing of C(T)50 specimens made of ferritic steel 20MnMoNi 55 at two temperatures within the transition temperature range. The effect of displacement rates is analysed by testing C(T) specimens at -60 degrees C, while the effect of plastic strain is analysed by introducing an initial fatigue crack with low and high stress intensity factor threshold values of Delta K, by testing the C(T) specimens at -90 degrees C, in accordance with ASTM 1820 standard. The analysis of these influences involves interpretation of test results for parameters J(c), CMOD, and r(c). Conclusions based on this analysis can be used in further studies which involve understanding of ductile to brittle transition region, as well as the general fracture behaviour of ferritic steels.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "Load and deformation effects on brittle fracture of ferritic steel 20МnМoНi 55 in temperature transition region",
pages = "189-184",
number = "2",
volume = "20",
url = "https://hdl.handle.net/21.15107/rcub_machinery_3440"
}

Đorđević, B. R., Sedmak, A., Petrovski, B., Sedmak, S.,& Radaković, Z.. (2020). Load and deformation effects on brittle fracture of ferritic steel 20МnМoНi 55 in temperature transition region. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 20(2), 184-189.
https://hdl.handle.net/21.15107/rcub_machinery_3440

Đorđević BR, Sedmak A, Petrovski B, Sedmak S, Radaković Z. Load and deformation effects on brittle fracture of ferritic steel 20МnМoНi 55 in temperature transition region. in Structural Integrity and Life. 2020;20(2):184-189.
https://hdl.handle.net/21.15107/rcub_machinery_3440 .

Đorđević, Branislav R., Sedmak, Aleksandar, Petrovski, Blagoj, Sedmak, Simon, Radaković, Zoran, "Load and deformation effects on brittle fracture of ferritic steel 20МnМoНi 55 in temperature transition region" in Structural Integrity and Life, 20, no. 2 (2020):184-189,
https://hdl.handle.net/21.15107/rcub_machinery_3440 .

TY  - JOUR
AU  - Jeremić, Lazar
AU  - Sedmak, Aleksandar
AU  - Petrovski, Blagoj
AU  - Đorđević, Branislav R.
AU  - Sedmak, Simon
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3422
AB  - The main goal of this paper was to assess the integrity of welded joints in the main pipeline of the reversible hydropower plant "Bajina Bata". Japanese steel Sumiten 80P (SM 80P) was used as the parent material. European recommendation for pipeline safety factor is equal to 1.7 and this value was used for calculations of the RHPP "Bajina Bata", whereas the value recommended by Japanese standards is 2.1. A relatively small safety factor, which is different from the Japanese recommendation (since the material itself is Japanese), represented one of the main reasons for a detailed investigation of the pipeline structural integrity and safety, using the prototype. In the case of pressure vessels, the welded joint is a location of stress concentration, which can act in the same way as residual stresses. Assessment of prototype test results is possible to perform based on stress and strain calculations of vessels with ideal geometry. For this reason, the solution for thin-walled vessels is given, both in elastic and elastic-plastic areas. Numerous tests were performed in order to obtain a reliability assessment necessary for the construction of the pipeline, since the consequences of potential failure would be disastrous in this case. A numerical simulation, based on the experimentally determined mechanical properties of the material used, was also performed in order to obtain the stress/strain distribution. These results were then compared to the experimentally obtained ones, and it was concluded that there is a good level of compliance between numerical and experimental results.
PB  - Univ Osijek, Tech Fac, Slavonski Brod
T2  - Tehnički vjesnik
T1  - Structural Integrity Assessment of Welded Pipeline Designed with Reduced Safety
EP  - 1466
IS  - 5
SP  - 1461
VL  - 27
DO  - 10.17559/TV-20200413142538
ER  - 

@article{
author = "Jeremić, Lazar and Sedmak, Aleksandar and Petrovski, Blagoj and Đorđević, Branislav R. and Sedmak, Simon",
year = "2020",
abstract = "The main goal of this paper was to assess the integrity of welded joints in the main pipeline of the reversible hydropower plant "Bajina Bata". Japanese steel Sumiten 80P (SM 80P) was used as the parent material. European recommendation for pipeline safety factor is equal to 1.7 and this value was used for calculations of the RHPP "Bajina Bata", whereas the value recommended by Japanese standards is 2.1. A relatively small safety factor, which is different from the Japanese recommendation (since the material itself is Japanese), represented one of the main reasons for a detailed investigation of the pipeline structural integrity and safety, using the prototype. In the case of pressure vessels, the welded joint is a location of stress concentration, which can act in the same way as residual stresses. Assessment of prototype test results is possible to perform based on stress and strain calculations of vessels with ideal geometry. For this reason, the solution for thin-walled vessels is given, both in elastic and elastic-plastic areas. Numerous tests were performed in order to obtain a reliability assessment necessary for the construction of the pipeline, since the consequences of potential failure would be disastrous in this case. A numerical simulation, based on the experimentally determined mechanical properties of the material used, was also performed in order to obtain the stress/strain distribution. These results were then compared to the experimentally obtained ones, and it was concluded that there is a good level of compliance between numerical and experimental results.",
publisher = "Univ Osijek, Tech Fac, Slavonski Brod",
journal = "Tehnički vjesnik",
title = "Structural Integrity Assessment of Welded Pipeline Designed with Reduced Safety",
pages = "1466-1461",
number = "5",
volume = "27",
doi = "10.17559/TV-20200413142538"
}

Jeremić, L., Sedmak, A., Petrovski, B., Đorđević, B. R.,& Sedmak, S.. (2020). Structural Integrity Assessment of Welded Pipeline Designed with Reduced Safety. in Tehnički vjesnik
Univ Osijek, Tech Fac, Slavonski Brod., 27(5), 1461-1466.
https://doi.org/10.17559/TV-20200413142538

Jeremić L, Sedmak A, Petrovski B, Đorđević BR, Sedmak S. Structural Integrity Assessment of Welded Pipeline Designed with Reduced Safety. in Tehnički vjesnik. 2020;27(5):1461-1466.
doi:10.17559/TV-20200413142538 .

Jeremić, Lazar, Sedmak, Aleksandar, Petrovski, Blagoj, Đorđević, Branislav R., Sedmak, Simon, "Structural Integrity Assessment of Welded Pipeline Designed with Reduced Safety" in Tehnički vjesnik, 27, no. 5 (2020):1461-1466,
https://doi.org/10.17559/TV-20200413142538 . .

TY  - JOUR
AU  - Swei, Mohamed
AU  - Sedmak, Aleksandar
AU  - Petrovski, Blagoj
AU  - Golubović, Zorana
AU  - Sedmak, Simon
AU  - Katinić, Marko
AU  - Azzabi, Khaled I.
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3180
AB  - The steels operating at elevated temperatures are well known to be exposed to premature failure due to cracking caused by constant thermal stress, i. e. secondary creep process. Therefore, creep crack growth tests were carried out on compact tension specimens machined from P91 weld joint at 600 degrees C to determine its behavior in realistic conditions. At the same time, numerical method for predicting the creep crack growth in compact tension specimens by a series of incremental steady-state finite element analysis were performed using Norton's law to represent creep behavior. Verification of the finite element predictions were obtained for weld metal and heat affected zone by comparison with experimental results, indicating at the same time that creep crack growth rates are significantly higher for weld metal than for base metal.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Creep crack growth behavior of p91 steel weldments
EP  - 1209
IS  - 2
SP  - 1203
VL  - 23
DO  - 10.2298/TSCI170729240S
ER  - 

@article{
author = "Swei, Mohamed and Sedmak, Aleksandar and Petrovski, Blagoj and Golubović, Zorana and Sedmak, Simon and Katinić, Marko and Azzabi, Khaled I.",
year = "2019",
abstract = "The steels operating at elevated temperatures are well known to be exposed to premature failure due to cracking caused by constant thermal stress, i. e. secondary creep process. Therefore, creep crack growth tests were carried out on compact tension specimens machined from P91 weld joint at 600 degrees C to determine its behavior in realistic conditions. At the same time, numerical method for predicting the creep crack growth in compact tension specimens by a series of incremental steady-state finite element analysis were performed using Norton's law to represent creep behavior. Verification of the finite element predictions were obtained for weld metal and heat affected zone by comparison with experimental results, indicating at the same time that creep crack growth rates are significantly higher for weld metal than for base metal.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Creep crack growth behavior of p91 steel weldments",
pages = "1209-1203",
number = "2",
volume = "23",
doi = "10.2298/TSCI170729240S"
}

Swei, M., Sedmak, A., Petrovski, B., Golubović, Z., Sedmak, S., Katinić, M.,& Azzabi, K. I.. (2019). Creep crack growth behavior of p91 steel weldments. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 23(2), 1203-1209.
https://doi.org/10.2298/TSCI170729240S

Swei M, Sedmak A, Petrovski B, Golubović Z, Sedmak S, Katinić M, Azzabi KI. Creep crack growth behavior of p91 steel weldments. in Thermal Science. 2019;23(2):1203-1209.
doi:10.2298/TSCI170729240S .

Swei, Mohamed, Sedmak, Aleksandar, Petrovski, Blagoj, Golubović, Zorana, Sedmak, Simon, Katinić, Marko, Azzabi, Khaled I., "Creep crack growth behavior of p91 steel weldments" in Thermal Science, 23, no. 2 (2019):1203-1209,
https://doi.org/10.2298/TSCI170729240S . .

TY  - JOUR
AU  - Sghayer, Abulgasem
AU  - Grbović, Aleksandar
AU  - Sedmak, Aleksandar
AU  - Dinulović, Mirko
AU  - Grozdanović, Ines
AU  - Sedmak, Simon
AU  - Petrovski, Blagoj
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2758
AB  - Experimental and numerical analysis of fatigue crack growth in integral skin-stringer panels, produced by means of laser beam welding (LBW), is performed. Since this type of panel is used in airframe construction, fatigue and damage tolerance is of paramount importance, since aircrafts must be tolerant to relatively large fatigue cracks. Firstly, using extended finite element method (XFEM), the fatigue crack growth on the simple flat plate made of AL-AA 6156T6/ 2.8 mm was simulated, and results were compared with values obtained in the experiment. The same approach was taken to simulate the fatigue behaviour and crack propagation of the real skinstringer panel (four stringers, laser beam welded). It was found that the results obtained for stress intensity factors (SIFs) KI, KII, KIII and Keff along the crack front, are close to the experimental results, leading to conclusion that the XFEM method can be successfully used in prediction of fatigue life of complex airframe structures, such as laserbeam welded skin-stringer panels.
PB  - Univ Osijek, Tech Fac, Slavonski Brod
T2  - Tehnički vjesnik
T1  - Experimental and Numerical Analysis of Fatigue Crack Growth in Integral Skin-Stringer Panels
EP  - 791
IS  - 3
SP  - 785
VL  - 25
DO  - 10.17559/TV-20170308110329
ER  - 

@article{
author = "Sghayer, Abulgasem and Grbović, Aleksandar and Sedmak, Aleksandar and Dinulović, Mirko and Grozdanović, Ines and Sedmak, Simon and Petrovski, Blagoj",
year = "2018",
abstract = "Experimental and numerical analysis of fatigue crack growth in integral skin-stringer panels, produced by means of laser beam welding (LBW), is performed. Since this type of panel is used in airframe construction, fatigue and damage tolerance is of paramount importance, since aircrafts must be tolerant to relatively large fatigue cracks. Firstly, using extended finite element method (XFEM), the fatigue crack growth on the simple flat plate made of AL-AA 6156T6/ 2.8 mm was simulated, and results were compared with values obtained in the experiment. The same approach was taken to simulate the fatigue behaviour and crack propagation of the real skinstringer panel (four stringers, laser beam welded). It was found that the results obtained for stress intensity factors (SIFs) KI, KII, KIII and Keff along the crack front, are close to the experimental results, leading to conclusion that the XFEM method can be successfully used in prediction of fatigue life of complex airframe structures, such as laserbeam welded skin-stringer panels.",
publisher = "Univ Osijek, Tech Fac, Slavonski Brod",
journal = "Tehnički vjesnik",
title = "Experimental and Numerical Analysis of Fatigue Crack Growth in Integral Skin-Stringer Panels",
pages = "791-785",
number = "3",
volume = "25",
doi = "10.17559/TV-20170308110329"
}

Sghayer, A., Grbović, A., Sedmak, A., Dinulović, M., Grozdanović, I., Sedmak, S.,& Petrovski, B.. (2018). Experimental and Numerical Analysis of Fatigue Crack Growth in Integral Skin-Stringer Panels. in Tehnički vjesnik
Univ Osijek, Tech Fac, Slavonski Brod., 25(3), 785-791.
https://doi.org/10.17559/TV-20170308110329

Sghayer A, Grbović A, Sedmak A, Dinulović M, Grozdanović I, Sedmak S, Petrovski B. Experimental and Numerical Analysis of Fatigue Crack Growth in Integral Skin-Stringer Panels. in Tehnički vjesnik. 2018;25(3):785-791.
doi:10.17559/TV-20170308110329 .

Sghayer, Abulgasem, Grbović, Aleksandar, Sedmak, Aleksandar, Dinulović, Mirko, Grozdanović, Ines, Sedmak, Simon, Petrovski, Blagoj, "Experimental and Numerical Analysis of Fatigue Crack Growth in Integral Skin-Stringer Panels" in Tehnički vjesnik, 25, no. 3 (2018):785-791,
https://doi.org/10.17559/TV-20170308110329 . .

TY  - CONF
AU  - Sedmak, Simon
AU  - Džindo, Emina
AU  - Radaković, Zoran
AU  - Petrovski, Blagoj
AU  - Aranđelović, Mihajlo
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4880
PB  - Serbian Welding Society – DUZS, Serbia
C3  - 4th IIW South-East European Welding Congress, Topic: Safe Welded Construction by High Quality Welding
T1  - FEM modeling of crack propagation in welded joints with different crack locations
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4880
ER  - 

@conference{
author = "Sedmak, Simon and Džindo, Emina and Radaković, Zoran and Petrovski, Blagoj and Aranđelović, Mihajlo",
year = "2018",
publisher = "Serbian Welding Society – DUZS, Serbia",
journal = "4th IIW South-East European Welding Congress, Topic: Safe Welded Construction by High Quality Welding",
title = "FEM modeling of crack propagation in welded joints with different crack locations",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4880"
}

Sedmak, S., Džindo, E., Radaković, Z., Petrovski, B.,& Aranđelović, M.. (2018). FEM modeling of crack propagation in welded joints with different crack locations. in 4th IIW South-East European Welding Congress, Topic: Safe Welded Construction by High Quality Welding
Serbian Welding Society – DUZS, Serbia..
https://hdl.handle.net/21.15107/rcub_machinery_4880

Sedmak S, Džindo E, Radaković Z, Petrovski B, Aranđelović M. FEM modeling of crack propagation in welded joints with different crack locations. in 4th IIW South-East European Welding Congress, Topic: Safe Welded Construction by High Quality Welding. 2018;.
https://hdl.handle.net/21.15107/rcub_machinery_4880 .

Sedmak, Simon, Džindo, Emina, Radaković, Zoran, Petrovski, Blagoj, Aranđelović, Mihajlo, "FEM modeling of crack propagation in welded joints with different crack locations" in 4th IIW South-East European Welding Congress, Topic: Safe Welded Construction by High Quality Welding (2018),
https://hdl.handle.net/21.15107/rcub_machinery_4880 .

TY  - JOUR
AU  - Džindo, Emina
AU  - Radaković, Zoran
AU  - Petrovski, Blagoj
AU  - Tadić, Srđan
AU  - Petronić, Sanja
AU  - Sedmak, Simon
AU  - Đorđević, Branislav
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4877
AB  - The steels fracture toughness was measured at two different temperature T= - 60°C and T = -90°C, at v=0.02 mm/min and v=0.5 mm/min. The following steels: CrMoV, 20MnMoNi55, A533B and A508 were tested with three different sizes of CT specimens 50 and 100 and 200. Those steels are weldable, although the authors investigated the fracture behaviour of base material. In order to satisfy statistical analyses, a large number of specimens were tested. Fracture behaviour has turned out to be typical, S-shaped curve for transitional fracture at low temperatures. Apart from the other variables, specimen’s width significantly affects measured toughness. Smaller specimens, CT50, might be considered of upper bound reliability while the CT200 specimens were shown to be the most conservative. In this way it has been shown that wider specimens are more reliable in a fracture assessment of the examined steels. In this paper, the fracture probabilities of specimens in function of fracture toughness were determined as well, and it could be concluded that the widest specimens are the most likely to be broken for the same values of the fracture toughness.
PB  - Trans Tech Publications Ltd.
T2  - Advanced Materials Research
T1  - Fracture toughness in the transition temperature region
EP  - 97
SP  - 92
VL  - 1146
DO  - 10.4028/www.scientific.net/AMR.1146.92
ER  - 

@article{
author = "Džindo, Emina and Radaković, Zoran and Petrovski, Blagoj and Tadić, Srđan and Petronić, Sanja and Sedmak, Simon and Đorđević, Branislav",
year = "2018",
abstract = "The steels fracture toughness was measured at two different temperature T= - 60°C and T = -90°C, at v=0.02 mm/min and v=0.5 mm/min. The following steels: CrMoV, 20MnMoNi55, A533B and A508 were tested with three different sizes of CT specimens 50 and 100 and 200. Those steels are weldable, although the authors investigated the fracture behaviour of base material. In order to satisfy statistical analyses, a large number of specimens were tested. Fracture behaviour has turned out to be typical, S-shaped curve for transitional fracture at low temperatures. Apart from the other variables, specimen’s width significantly affects measured toughness. Smaller specimens, CT50, might be considered of upper bound reliability while the CT200 specimens were shown to be the most conservative. In this way it has been shown that wider specimens are more reliable in a fracture assessment of the examined steels. In this paper, the fracture probabilities of specimens in function of fracture toughness were determined as well, and it could be concluded that the widest specimens are the most likely to be broken for the same values of the fracture toughness.",
publisher = "Trans Tech Publications Ltd.",
journal = "Advanced Materials Research",
title = "Fracture toughness in the transition temperature region",
pages = "97-92",
volume = "1146",
doi = "10.4028/www.scientific.net/AMR.1146.92"
}

Džindo, E., Radaković, Z., Petrovski, B., Tadić, S., Petronić, S., Sedmak, S.,& Đorđević, B.. (2018). Fracture toughness in the transition temperature region. in Advanced Materials Research
Trans Tech Publications Ltd.., 1146, 92-97.
https://doi.org/10.4028/www.scientific.net/AMR.1146.92

Džindo E, Radaković Z, Petrovski B, Tadić S, Petronić S, Sedmak S, Đorđević B. Fracture toughness in the transition temperature region. in Advanced Materials Research. 2018;1146:92-97.
doi:10.4028/www.scientific.net/AMR.1146.92 .

Džindo, Emina, Radaković, Zoran, Petrovski, Blagoj, Tadić, Srđan, Petronić, Sanja, Sedmak, Simon, Đorđević, Branislav, "Fracture toughness in the transition temperature region" in Advanced Materials Research, 1146 (2018):92-97,
https://doi.org/10.4028/www.scientific.net/AMR.1146.92 . .

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  - JOUR
AU  - Sghayer, Abulgasem
AU  - Grbović, Aleksandar
AU  - Sedmak, Aleksandar
AU  - Dinulović, Mirko
AU  - Doncheva, Elisaveta
AU  - Petrovski, Blagoj
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2711
AB  - Fatigue life of integral skin-stringer panels produced by laser beam welding (LBW) is analysed. This type of panel is used in airframe construction where fatigue and damage tolerance are of paramount importance, since aircrafts must be designed to tolerate relatively large fatigue cracks. The analysed integral skin-stringer panel is made of AL-AA 6156T6/2.8 mm, where stringers are laser beam welded to the airframe skin. By using the extended finite element method (XFEM), fatigue life of simple flat plate, as well of the skin-stringer panel, are numerically simulated in order to investigate the effect of stringers.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity and Life
T1  - Fatigue life analysis of the integral skin-stringer panel using xfem
EP  - 10
IS  - 1
SP  - 7
VL  - 17
UR  - https://hdl.handle.net/21.15107/rcub_machinery_2711
ER  - 

@article{
author = "Sghayer, Abulgasem and Grbović, Aleksandar and Sedmak, Aleksandar and Dinulović, Mirko and Doncheva, Elisaveta and Petrovski, Blagoj",
year = "2017",
abstract = "Fatigue life of integral skin-stringer panels produced by laser beam welding (LBW) is analysed. This type of panel is used in airframe construction where fatigue and damage tolerance are of paramount importance, since aircrafts must be designed to tolerate relatively large fatigue cracks. The analysed integral skin-stringer panel is made of AL-AA 6156T6/2.8 mm, where stringers are laser beam welded to the airframe skin. By using the extended finite element method (XFEM), fatigue life of simple flat plate, as well of the skin-stringer panel, are numerically simulated in order to investigate the effect of stringers.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "Fatigue life analysis of the integral skin-stringer panel using xfem",
pages = "10-7",
number = "1",
volume = "17",
url = "https://hdl.handle.net/21.15107/rcub_machinery_2711"
}

Sghayer, A., Grbović, A., Sedmak, A., Dinulović, M., Doncheva, E.,& Petrovski, B.. (2017). Fatigue life analysis of the integral skin-stringer panel using xfem. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 17(1), 7-10.
https://hdl.handle.net/21.15107/rcub_machinery_2711

Sghayer A, Grbović A, Sedmak A, Dinulović M, Doncheva E, Petrovski B. Fatigue life analysis of the integral skin-stringer panel using xfem. in Structural Integrity and Life. 2017;17(1):7-10.
https://hdl.handle.net/21.15107/rcub_machinery_2711 .

Sghayer, Abulgasem, Grbović, Aleksandar, Sedmak, Aleksandar, Dinulović, Mirko, Doncheva, Elisaveta, Petrovski, Blagoj, "Fatigue life analysis of the integral skin-stringer panel using xfem" in Structural Integrity and Life, 17, no. 1 (2017):7-10,
https://hdl.handle.net/21.15107/rcub_machinery_2711 .

TY  - CONF
AU  - Petrovski, Blagoj
AU  - Sedmak, Aleksandar
AU  - Swei, M.
AU  - Milović, Ljubica
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2741
AB  - The deformation and crack growth behaviour of P22 and P91 steel weldments tested at 550 °C and 600 °C, respectively,compact C(T) type specimens with sharp EDM starter notches in the base metal (BM) and heat affected zone (HAZ) were tested.The test procedures are detailed and followed in ASTM E1457.00, the crack growth data are interpreted using the fracture mechanics parameter C*. The initial crack is located within the HAZ of the weldments for both steel types, comparison of results show large similarity of both steels behaviour and the crack growth rates for the crack located within the HAZ are higher than with BM values.
PB  - International Conference on Fracture
C3  - ICF 2017 - 14th International Conference on Fracture
T1  - Creep crack growth - Comparison of two steel P91 and P22
EP  - 874
SP  - 873
VL  - 2
UR  - https://hdl.handle.net/21.15107/rcub_technorep_3484
ER  - 

@conference{
author = "Petrovski, Blagoj and Sedmak, Aleksandar and Swei, M. and Milović, Ljubica",
year = "2017",
abstract = "The deformation and crack growth behaviour of P22 and P91 steel weldments tested at 550 °C and 600 °C, respectively,compact C(T) type specimens with sharp EDM starter notches in the base metal (BM) and heat affected zone (HAZ) were tested.The test procedures are detailed and followed in ASTM E1457.00, the crack growth data are interpreted using the fracture mechanics parameter C*. The initial crack is located within the HAZ of the weldments for both steel types, comparison of results show large similarity of both steels behaviour and the crack growth rates for the crack located within the HAZ are higher than with BM values.",
publisher = "International Conference on Fracture",
journal = "ICF 2017 - 14th International Conference on Fracture",
title = "Creep crack growth - Comparison of two steel P91 and P22",
pages = "874-873",
volume = "2",
url = "https://hdl.handle.net/21.15107/rcub_technorep_3484"
}

Petrovski, B., Sedmak, A., Swei, M.,& Milović, L.. (2017). Creep crack growth - Comparison of two steel P91 and P22. in ICF 2017 - 14th International Conference on Fracture
International Conference on Fracture., 2, 873-874.
https://hdl.handle.net/21.15107/rcub_technorep_3484

Petrovski B, Sedmak A, Swei M, Milović L. Creep crack growth - Comparison of two steel P91 and P22. in ICF 2017 - 14th International Conference on Fracture. 2017;2:873-874.
https://hdl.handle.net/21.15107/rcub_technorep_3484 .

Petrovski, Blagoj, Sedmak, Aleksandar, Swei, M., Milović, Ljubica, "Creep crack growth - Comparison of two steel P91 and P22" in ICF 2017 - 14th International Conference on Fracture, 2 (2017):873-874,
https://hdl.handle.net/21.15107/rcub_technorep_3484 .

TY  - JOUR
AU  - Radaković, Zoran
AU  - Abukhres, Mohamed Omar
AU  - Sedmak, Aleksandar
AU  - Ivanović, Ivana
AU  - Petrovski, Blagoj
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1632
AB  - Direktno merenje J integrala je analizirano u odnosu na uticaj heterogenosti i ojačavanja materijala, kao i različitih graničnih uslova, a u cilju primene na posude pod pritiskom sa prslinom u zavarenom spoju. Pokazano je da su neophodne modifikacije originalnog izraza. Takođe su razmatrane mogućnosti primene direktnog merenja J integrala kao metode procene integriteta posude pod pritiskom.
AB  - Direct measurement of J integral has been analysed in respect to the effect of material (heterogeneity and strengthening) and different boundary conditions, enabling its application to pressure vessels with a crack in welded joint. It has been shown that modifications of the original expression are needed. The possibility of applying direct measurement of J integral for pressure vessel integrity assessment has been considered.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Integritet i vek konstrukcija
T1  - Direktno merenje J integrala na posudi pod pritiskom
T1  - Direct measurement of the J integral on a pressure vessel
EP  - 169
IS  - 3
SP  - 163
VL  - 13
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1632
ER  - 

@article{
author = "Radaković, Zoran and Abukhres, Mohamed Omar and Sedmak, Aleksandar and Ivanović, Ivana and Petrovski, Blagoj",
year = "2013",
abstract = "Direktno merenje J integrala je analizirano u odnosu na uticaj heterogenosti i ojačavanja materijala, kao i različitih graničnih uslova, a u cilju primene na posude pod pritiskom sa prslinom u zavarenom spoju. Pokazano je da su neophodne modifikacije originalnog izraza. Takođe su razmatrane mogućnosti primene direktnog merenja J integrala kao metode procene integriteta posude pod pritiskom., Direct measurement of J integral has been analysed in respect to the effect of material (heterogeneity and strengthening) and different boundary conditions, enabling its application to pressure vessels with a crack in welded joint. It has been shown that modifications of the original expression are needed. The possibility of applying direct measurement of J integral for pressure vessel integrity assessment has been considered.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Integritet i vek konstrukcija",
title = "Direktno merenje J integrala na posudi pod pritiskom, Direct measurement of the J integral on a pressure vessel",
pages = "169-163",
number = "3",
volume = "13",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1632"
}

Radaković, Z., Abukhres, M. O., Sedmak, A., Ivanović, I.,& Petrovski, B.. (2013). Direktno merenje J integrala na posudi pod pritiskom. in Integritet i vek konstrukcija
Institut za ispitivanje materijala, Beograd., 13(3), 163-169.
https://hdl.handle.net/21.15107/rcub_machinery_1632

Radaković Z, Abukhres MO, Sedmak A, Ivanović I, Petrovski B. Direktno merenje J integrala na posudi pod pritiskom. in Integritet i vek konstrukcija. 2013;13(3):163-169.
https://hdl.handle.net/21.15107/rcub_machinery_1632 .

Radaković, Zoran, Abukhres, Mohamed Omar, Sedmak, Aleksandar, Ivanović, Ivana, Petrovski, Blagoj, "Direktno merenje J integrala na posudi pod pritiskom" in Integritet i vek konstrukcija, 13, no. 3 (2013):163-169,
https://hdl.handle.net/21.15107/rcub_machinery_1632 .

TY  - JOUR
AU  - Milović, Ljubica
AU  - Milošević-Mitić, Vesna
AU  - Radaković, Zoran
AU  - Anđelić, Nina
AU  - Petrovski, Blagoj
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1616
AB  - U radu je prikazana ocena integriteta ispitne posude pod pritiskom izrađene od niskolegiranog čelika povišene čvrstoće sa spoljašnjom površinskom prslinom na zidu omotača. Da bi se ocenila preostala čvrstoća i otpornost na stabilan rast prsline, eksperimentalno je izmeren J-integral na radnoj temperaturi od -40°C. Poređenjem sile rasta prsline i otpornosti materijala na rast prsline određena je veličina zone stabilnog rasta prsline kao i kritična veličina prsline. Prikazan je i proračun posude pod pritiskom primenom teorije konačnih elemenata za linearno-elastično ponašanje materijala. Kritične vrednosti pritisaka izračunate analitičkim i numeričkim postupkom pokazuju dobro slaganje.
AB  - The paper illustrates the structural assessment of an investigated pressure vessel, made of low-alloyed high strength steel, with an external surface crack located on the shell wall. In order to assess the remaining strength and the resistance to stable crack growth, the J-integral is experimentally measured at operating temperature of -40°C. The compared crack driving force and material resistance to crack growth have determined the size of the zone of stable crack development, as well as the critical crack length. Also given is the pressure vessel calculation code by applying the theory of finite elements to linear-elastic material behaviour. Critical pressure values are calculated by analytical and numerical procedures and show good agreement.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Integritet i vek konstrukcija
T1  - Procena nosivosti posude pod pritiskom u prisustvu prsline
T1  - Assessment of pressure vessel load capacity in the presence of cracks
EP  - 16
IS  - 1
SP  - 9
VL  - 13
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2296
ER  - 

@article{
author = "Milović, Ljubica and Milošević-Mitić, Vesna and Radaković, Zoran and Anđelić, Nina and Petrovski, Blagoj",
year = "2013",
abstract = "U radu je prikazana ocena integriteta ispitne posude pod pritiskom izrađene od niskolegiranog čelika povišene čvrstoće sa spoljašnjom površinskom prslinom na zidu omotača. Da bi se ocenila preostala čvrstoća i otpornost na stabilan rast prsline, eksperimentalno je izmeren J-integral na radnoj temperaturi od -40°C. Poređenjem sile rasta prsline i otpornosti materijala na rast prsline određena je veličina zone stabilnog rasta prsline kao i kritična veličina prsline. Prikazan je i proračun posude pod pritiskom primenom teorije konačnih elemenata za linearno-elastično ponašanje materijala. Kritične vrednosti pritisaka izračunate analitičkim i numeričkim postupkom pokazuju dobro slaganje., The paper illustrates the structural assessment of an investigated pressure vessel, made of low-alloyed high strength steel, with an external surface crack located on the shell wall. In order to assess the remaining strength and the resistance to stable crack growth, the J-integral is experimentally measured at operating temperature of -40°C. The compared crack driving force and material resistance to crack growth have determined the size of the zone of stable crack development, as well as the critical crack length. Also given is the pressure vessel calculation code by applying the theory of finite elements to linear-elastic material behaviour. Critical pressure values are calculated by analytical and numerical procedures and show good agreement.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Integritet i vek konstrukcija",
title = "Procena nosivosti posude pod pritiskom u prisustvu prsline, Assessment of pressure vessel load capacity in the presence of cracks",
pages = "16-9",
number = "1",
volume = "13",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2296"
}

Milović, L., Milošević-Mitić, V., Radaković, Z., Anđelić, N.,& Petrovski, B.. (2013). Procena nosivosti posude pod pritiskom u prisustvu prsline. in Integritet i vek konstrukcija
Institut za ispitivanje materijala, Beograd., 13(1), 9-16.
https://hdl.handle.net/21.15107/rcub_technorep_2296

Milović L, Milošević-Mitić V, Radaković Z, Anđelić N, Petrovski B. Procena nosivosti posude pod pritiskom u prisustvu prsline. in Integritet i vek konstrukcija. 2013;13(1):9-16.
https://hdl.handle.net/21.15107/rcub_technorep_2296 .

Milović, Ljubica, Milošević-Mitić, Vesna, Radaković, Zoran, Anđelić, Nina, Petrovski, Blagoj, "Procena nosivosti posude pod pritiskom u prisustvu prsline" in Integritet i vek konstrukcija, 13, no. 1 (2013):9-16,
https://hdl.handle.net/21.15107/rcub_technorep_2296 .

TY  - JOUR
AU  - Milović, Ljubica
AU  - Vuherer, Tomaž
AU  - Radaković, Zoran
AU  - Zrilić, Milorad
AU  - Daničić, Darko
AU  - Petrovski, Blagoj
AU  - Janković, Miodrag
PY  - 2011
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4962
AB  - The structural integrity and operational safety of welded pressure vessels primarily depends on the behaviour of weldments. In spite of all efforts in material production and improvements in welding techniques, including strict codes, requirements and directives, the crack occurrence in welded structures cannot be completely excluded. This is why fracture mechanics analysis is inevitable in the structural integrity assessment of all welded structures. Examples of practical application of fracture mechanics parameters in cracked pressure vessel structural integrity are considered. This paper shows the determination of parameters of the fatigue crack for constituents of welded joints produced of high strength low alloyed steel Nionikral-70 (yield strength 700 MPa). Results have shown that the position of notch and crack initiation affect the values of the stress intensity range of fatigue threshold ΔKth and parameters in the Paris’ equation.
AB  - Integritet konstrukcije i sigurnost u radu zavarenih posuda pod pritiskom uglavnom zavisi od ponašanja zavarenih spojeva. Pored svih uloženih napora u proizvodnji i poboljšanja postupaka zavarivanja, uključujući i stroge standarde, zahteve i smernice, pojava prslina u zavarenim konstrukcijama se ne može u potpunosti izbeći. Zato je analiza mehanike loma neophodna u proceni integriteta svih zavarenih konstrukcija. Razmotreni su primeri praktične primene parametara mehanike loma u integritetu posuda pod pritiskom sa prslinom. Rad prikazuje određivanje parametara zamorne prsline za konstituente zavarenih spojeva izrađenih od niskolegiranog čelika povišene čvrstoće Nionikral-70 (napona tečenja 700 MPa). Rezultati pokazuju da položaj zareza i inicijacija prsline utiču na vrednosti raspona napona za granicu zamora ΔKth i na parametre Parisove relacije.
PB  - Society for Structural Integrity and Life (Društvo za integritet i vek konstrukcija, DIVK)
PB  - Institut za ispitivanje materijala (IMS), Beograd
T2  - Structural Integrity and Life (Integritet i vek konstrukcija)
T1  - Determination of fatigue crack growth parameters in welded joint of HSLA steel
T1  - Određivanje parametara zamornog rasta prsline kod zavarenih spojeva od HSLA čelika
EP  - 187
IS  - 3
SP  - 183
VL  - 11
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4962
ER  - 

@article{
author = "Milović, Ljubica and Vuherer, Tomaž and Radaković, Zoran and Zrilić, Milorad and Daničić, Darko and Petrovski, Blagoj and Janković, Miodrag",
year = "2011",
abstract = "The structural integrity and operational safety of welded pressure vessels primarily depends on the behaviour of weldments. In spite of all efforts in material production and improvements in welding techniques, including strict codes, requirements and directives, the crack occurrence in welded structures cannot be completely excluded. This is why fracture mechanics analysis is inevitable in the structural integrity assessment of all welded structures. Examples of practical application of fracture mechanics parameters in cracked pressure vessel structural integrity are considered. This paper shows the determination of parameters of the fatigue crack for constituents of welded joints produced of high strength low alloyed steel Nionikral-70 (yield strength 700 MPa). Results have shown that the position of notch and crack initiation affect the values of the stress intensity range of fatigue threshold ΔKth and parameters in the Paris’ equation., Integritet konstrukcije i sigurnost u radu zavarenih posuda pod pritiskom uglavnom zavisi od ponašanja zavarenih spojeva. Pored svih uloženih napora u proizvodnji i poboljšanja postupaka zavarivanja, uključujući i stroge standarde, zahteve i smernice, pojava prslina u zavarenim konstrukcijama se ne može u potpunosti izbeći. Zato je analiza mehanike loma neophodna u proceni integriteta svih zavarenih konstrukcija. Razmotreni su primeri praktične primene parametara mehanike loma u integritetu posuda pod pritiskom sa prslinom. Rad prikazuje određivanje parametara zamorne prsline za konstituente zavarenih spojeva izrađenih od niskolegiranog čelika povišene čvrstoće Nionikral-70 (napona tečenja 700 MPa). Rezultati pokazuju da položaj zareza i inicijacija prsline utiču na vrednosti raspona napona za granicu zamora ΔKth i na parametre Parisove relacije.",
publisher = "Society for Structural Integrity and Life (Društvo za integritet i vek konstrukcija, DIVK), Institut za ispitivanje materijala (IMS), Beograd",
journal = "Structural Integrity and Life (Integritet i vek konstrukcija)",
title = "Determination of fatigue crack growth parameters in welded joint of HSLA steel, Određivanje parametara zamornog rasta prsline kod zavarenih spojeva od HSLA čelika",
pages = "187-183",
number = "3",
volume = "11",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4962"
}

Milović, L., Vuherer, T., Radaković, Z., Zrilić, M., Daničić, D., Petrovski, B.,& Janković, M.. (2011). Determination of fatigue crack growth parameters in welded joint of HSLA steel. in Structural Integrity and Life (Integritet i vek konstrukcija)
Society for Structural Integrity and Life (Društvo za integritet i vek konstrukcija, DIVK)., 11(3), 183-187.
https://hdl.handle.net/21.15107/rcub_machinery_4962

Milović L, Vuherer T, Radaković Z, Zrilić M, Daničić D, Petrovski B, Janković M. Determination of fatigue crack growth parameters in welded joint of HSLA steel. in Structural Integrity and Life (Integritet i vek konstrukcija). 2011;11(3):183-187.
https://hdl.handle.net/21.15107/rcub_machinery_4962 .

Milović, Ljubica, Vuherer, Tomaž, Radaković, Zoran, Zrilić, Milorad, Daničić, Darko, Petrovski, Blagoj, Janković, Miodrag, "Determination of fatigue crack growth parameters in welded joint of HSLA steel" in Structural Integrity and Life (Integritet i vek konstrukcija), 11, no. 3 (2011):183-187,
https://hdl.handle.net/21.15107/rcub_machinery_4962 .

TY  - CONF
AU  - Milović, Ljubica
AU  - Vuherer, Tomaž
AU  - Radaković, Zoran
AU  - Petrovski, Blagoj
AU  - Janković, Miodrag
AU  - Zrilić, Milorad
AU  - Daničić, Darko
PY  - 2011
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1287
AB  - Integritet konstrukcije i sigurnost u radu zavarenih posuda pod pritiskom uglavnom zavisi od ponašanja zavarenih spojeva. Pored svih uloženih napora u proizvodnji i poboljšanja postupaka zavarivanja, uključujući i stroge standarde, zahteve i smernice, pojava prslina u zavarenim konstrukcijama se ne može u potpunosti izbeći. Zato je analiza mehanike loma neophodna u proceni integriteta svih zavarenih konstrukcija. Razmotreni su primeri praktične primene parametara mehanike loma u integritetu posuda pod pritiskom sa prslinom. Rad prikazuje određivanje parametara zamorne prsline za konstituente zavarenih spojeva izrađenih od niskolegiranog čelika povišene čvrstoće Nionikral-70 (napona tečenja 700 MPa). Rezultati pokazuju da položaj zareza i inicijacija prsline utiču na vrednosti raspona napona za granicu zamora DKth i na parametre Parisove relacije.
AB  - The structural integrity and operational safety of welded pressure vessels primarily depends on the behaviour of weldments. In spite of all efforts in material production and improvements in welding techniques, including strict codes, requirements and directives, the crack occurrence in welded structures cannot be completely excluded. This is why fracture mechanics analysis is inevitable in the structural integrity assessment of all welded structures. Examples of practical application of fracture mechanics parameters in cracked pressure vessel structural integrity are considered. This paper shows the determination of parameters of the fatigue crack for constituents of welded joints produced of high strength low alloyed steel Nionikral-70 (yield strength 700 MPa). Results have shown that the position of notch and crack initiation affect the values of the stress intensity range of fatigue threshold DKth and parameters in the Paris' equation.
PB  - Institut za ispitivanje materijala, Beograd
C3  - Structural Integrity and Life
T1  - Određivanje parametara zamornog rasta prsline kod zavarenih spojeva od HSLA čelika
T1  - Determination of fatigue crack growth parameters in welded joint of HSLA steel
EP  - 187
IS  - 3
SP  - 183
VL  - 11
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1840
ER  - 

@conference{
author = "Milović, Ljubica and Vuherer, Tomaž and Radaković, Zoran and Petrovski, Blagoj and Janković, Miodrag and Zrilić, Milorad and Daničić, Darko",
year = "2011",
abstract = "Integritet konstrukcije i sigurnost u radu zavarenih posuda pod pritiskom uglavnom zavisi od ponašanja zavarenih spojeva. Pored svih uloženih napora u proizvodnji i poboljšanja postupaka zavarivanja, uključujući i stroge standarde, zahteve i smernice, pojava prslina u zavarenim konstrukcijama se ne može u potpunosti izbeći. Zato je analiza mehanike loma neophodna u proceni integriteta svih zavarenih konstrukcija. Razmotreni su primeri praktične primene parametara mehanike loma u integritetu posuda pod pritiskom sa prslinom. Rad prikazuje određivanje parametara zamorne prsline za konstituente zavarenih spojeva izrađenih od niskolegiranog čelika povišene čvrstoće Nionikral-70 (napona tečenja 700 MPa). Rezultati pokazuju da položaj zareza i inicijacija prsline utiču na vrednosti raspona napona za granicu zamora DKth i na parametre Parisove relacije., The structural integrity and operational safety of welded pressure vessels primarily depends on the behaviour of weldments. In spite of all efforts in material production and improvements in welding techniques, including strict codes, requirements and directives, the crack occurrence in welded structures cannot be completely excluded. This is why fracture mechanics analysis is inevitable in the structural integrity assessment of all welded structures. Examples of practical application of fracture mechanics parameters in cracked pressure vessel structural integrity are considered. This paper shows the determination of parameters of the fatigue crack for constituents of welded joints produced of high strength low alloyed steel Nionikral-70 (yield strength 700 MPa). Results have shown that the position of notch and crack initiation affect the values of the stress intensity range of fatigue threshold DKth and parameters in the Paris' equation.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "Određivanje parametara zamornog rasta prsline kod zavarenih spojeva od HSLA čelika, Determination of fatigue crack growth parameters in welded joint of HSLA steel",
pages = "187-183",
number = "3",
volume = "11",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1840"
}

Milović, L., Vuherer, T., Radaković, Z., Petrovski, B., Janković, M., Zrilić, M.,& Daničić, D.. (2011). Određivanje parametara zamornog rasta prsline kod zavarenih spojeva od HSLA čelika. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 11(3), 183-187.
https://hdl.handle.net/21.15107/rcub_technorep_1840

Milović L, Vuherer T, Radaković Z, Petrovski B, Janković M, Zrilić M, Daničić D. Određivanje parametara zamornog rasta prsline kod zavarenih spojeva od HSLA čelika. in Structural Integrity and Life. 2011;11(3):183-187.
https://hdl.handle.net/21.15107/rcub_technorep_1840 .

Milović, Ljubica, Vuherer, Tomaž, Radaković, Zoran, Petrovski, Blagoj, Janković, Miodrag, Zrilić, Milorad, Daničić, Darko, "Određivanje parametara zamornog rasta prsline kod zavarenih spojeva od HSLA čelika" in Structural Integrity and Life, 11, no. 3 (2011):183-187,
https://hdl.handle.net/21.15107/rcub_technorep_1840 .

TY  - JOUR
AU  - Essamei, Ali Mohamed
AU  - Radaković, Zoran
AU  - Sedmak, Aleksandar
AU  - Petrovski, Blagoj
PY  - 1999
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5467
AB  - Oštećenja oblika površinske prsline su namerno uneta da bi se pratilo ponašanje posude pod pritiskom u eksploatacijskim uslovima. Ustanovljena je i realizovana procedura direktnog merenja J integrala sa ciljem dobijanja realne ocene stvarnog ponašanja konstrukcije u smislu njene otpornosti na rast prsline. Obrada eksperimentalnih rezultata izvedene je na način kojim se uzima u obzir dvoosno naponsko stanje i koriguje jednoosni napon tečenja odgovarajućom vrednosti za cilindričnu posudu pod pritiskom.
AB  - Damages in the form of surface cracks are intentionally produced in order to monitor the in-service behaviour of a full scale pressure vessel. A procedure is established and performed for J-integral direct measurement for highly realistic assessment of true structural behaviour, e.g. resistance to crack growth. Experimental results treated by considering two-dimensional stress state and one-dimensional yield strength is corrected by applying two-dimensional stress analysis on cylindrical pressure vessels.
PB  - Društvo za unapređivanje zavarivanja u Srbiji (DUZS)
PB  - Zavod za zavarivanje, Beograd
PB  - YU WELD, Beograd
PB  - Institut GOŠA, Smederevska Palanka
T2  - Zavarivanje i zavarene konstrukcije
T1  - Direktno merenje J integrala kao ocena podobnosti za upotrebu
T1  - J-integral direct measurement as an assessment of fitness for service
EP  - 141
IS  - 4
SP  - 137
VL  - 44
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5467
ER  - 

@article{
author = "Essamei, Ali Mohamed and Radaković, Zoran and Sedmak, Aleksandar and Petrovski, Blagoj",
year = "1999",
abstract = "Oštećenja oblika površinske prsline su namerno uneta da bi se pratilo ponašanje posude pod pritiskom u eksploatacijskim uslovima. Ustanovljena je i realizovana procedura direktnog merenja J integrala sa ciljem dobijanja realne ocene stvarnog ponašanja konstrukcije u smislu njene otpornosti na rast prsline. Obrada eksperimentalnih rezultata izvedene je na način kojim se uzima u obzir dvoosno naponsko stanje i koriguje jednoosni napon tečenja odgovarajućom vrednosti za cilindričnu posudu pod pritiskom., Damages in the form of surface cracks are intentionally produced in order to monitor the in-service behaviour of a full scale pressure vessel. A procedure is established and performed for J-integral direct measurement for highly realistic assessment of true structural behaviour, e.g. resistance to crack growth. Experimental results treated by considering two-dimensional stress state and one-dimensional yield strength is corrected by applying two-dimensional stress analysis on cylindrical pressure vessels.",
publisher = "Društvo za unapređivanje zavarivanja u Srbiji (DUZS), Zavod za zavarivanje, Beograd, YU WELD, Beograd, Institut GOŠA, Smederevska Palanka",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Direktno merenje J integrala kao ocena podobnosti za upotrebu, J-integral direct measurement as an assessment of fitness for service",
pages = "141-137",
number = "4",
volume = "44",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5467"
}

Essamei, A. M., Radaković, Z., Sedmak, A.,& Petrovski, B.. (1999). Direktno merenje J integrala kao ocena podobnosti za upotrebu. in Zavarivanje i zavarene konstrukcije
Društvo za unapređivanje zavarivanja u Srbiji (DUZS)., 44(4), 137-141.
https://hdl.handle.net/21.15107/rcub_machinery_5467

Essamei AM, Radaković Z, Sedmak A, Petrovski B. Direktno merenje J integrala kao ocena podobnosti za upotrebu. in Zavarivanje i zavarene konstrukcije. 1999;44(4):137-141.
https://hdl.handle.net/21.15107/rcub_machinery_5467 .

Essamei, Ali Mohamed, Radaković, Zoran, Sedmak, Aleksandar, Petrovski, Blagoj, "Direktno merenje J integrala kao ocena podobnosti za upotrebu" in Zavarivanje i zavarene konstrukcije, 44, no. 4 (1999):137-141,
https://hdl.handle.net/21.15107/rcub_machinery_5467 .

TY  - JOUR
AU  - Sedmak, S
AU  - Petrovski, Blagoj
AU  - Sedmak, Aleksandar
PY  - 1996
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/140
AB  - Fracture mechanics parameters (stress intensity factor K-I and its critical value K-Ic, crack opening displacement, and the contour J integral) are originally defined for static and quasistatic loading conditions. On the basis of theoretical background, standard test methods for the experimental determination of their specific values were developed. Structural integrity analysis requires the extension of application of these parameters to other types of loading. We propose new parameters for stress corrosion (stress corrosion cracking threshold K-Isco), for cyclic loading (stress intensity factor range Delta K and fatigue-threshold Delta K-th), and for creeping at elevated temperatures (C* and C-t integrals). The structural integrity of welded structures is mainly affected by cracks in welded joints. We demonstrate the practical application of fracture mechanics parameters to the evaluation of structural integrity under the above-mentioned loading conditions.
PB  - Plenum Publ Corp, New York
T2  - Materials Science
T1  - Crack significance evaluation with special reference to welded structures
EP  - 243
IS  - 2
SP  - 231
VL  - 32
DO  - 10.1007/BF02538903
ER  - 

@article{
author = "Sedmak, S and Petrovski, Blagoj and Sedmak, Aleksandar",
year = "1996",
abstract = "Fracture mechanics parameters (stress intensity factor K-I and its critical value K-Ic, crack opening displacement, and the contour J integral) are originally defined for static and quasistatic loading conditions. On the basis of theoretical background, standard test methods for the experimental determination of their specific values were developed. Structural integrity analysis requires the extension of application of these parameters to other types of loading. We propose new parameters for stress corrosion (stress corrosion cracking threshold K-Isco), for cyclic loading (stress intensity factor range Delta K and fatigue-threshold Delta K-th), and for creeping at elevated temperatures (C* and C-t integrals). The structural integrity of welded structures is mainly affected by cracks in welded joints. We demonstrate the practical application of fracture mechanics parameters to the evaluation of structural integrity under the above-mentioned loading conditions.",
publisher = "Plenum Publ Corp, New York",
journal = "Materials Science",
title = "Crack significance evaluation with special reference to welded structures",
pages = "243-231",
number = "2",
volume = "32",
doi = "10.1007/BF02538903"
}

Sedmak, S., Petrovski, B.,& Sedmak, A.. (1996). Crack significance evaluation with special reference to welded structures. in Materials Science
Plenum Publ Corp, New York., 32(2), 231-243.
https://doi.org/10.1007/BF02538903

Sedmak S, Petrovski B, Sedmak A. Crack significance evaluation with special reference to welded structures. in Materials Science. 1996;32(2):231-243.
doi:10.1007/BF02538903 .

Sedmak, S, Petrovski, Blagoj, Sedmak, Aleksandar, "Crack significance evaluation with special reference to welded structures" in Materials Science, 32, no. 2 (1996):231-243,
https://doi.org/10.1007/BF02538903 . .

TY  - JOUR
AU  - Sedmak, Stojan
AU  - Petrovski, Blagoj
AU  - Sedmak, Aleksandar
PY  - 1992
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/116
AB  - The growth of a crack in regions of welded joints, made from high-strength low-alloy steel, has been analysed on specimens and full-scale structures. The effect of such crack growth on the safety of welded steel pressure vessels has been considered.
T2  - International Journal of Pressure Vessels and Piping
T1  - The resistance to crack growth of different regions of weldments in a real structure
EP  - 335
IS  - 3
SP  - 313
VL  - 52
DO  - 10.1016/0308-0161(92)90089-X
ER  - 

@article{
author = "Sedmak, Stojan and Petrovski, Blagoj and Sedmak, Aleksandar",
year = "1992",
abstract = "The growth of a crack in regions of welded joints, made from high-strength low-alloy steel, has been analysed on specimens and full-scale structures. The effect of such crack growth on the safety of welded steel pressure vessels has been considered.",
journal = "International Journal of Pressure Vessels and Piping",
title = "The resistance to crack growth of different regions of weldments in a real structure",
pages = "335-313",
number = "3",
volume = "52",
doi = "10.1016/0308-0161(92)90089-X"
}

Sedmak, S., Petrovski, B.,& Sedmak, A.. (1992). The resistance to crack growth of different regions of weldments in a real structure. in International Journal of Pressure Vessels and Piping, 52(3), 313-335.
https://doi.org/10.1016/0308-0161(92)90089-X

Sedmak S, Petrovski B, Sedmak A. The resistance to crack growth of different regions of weldments in a real structure. in International Journal of Pressure Vessels and Piping. 1992;52(3):313-335.
doi:10.1016/0308-0161(92)90089-X .

Sedmak, Stojan, Petrovski, Blagoj, Sedmak, Aleksandar, "The resistance to crack growth of different regions of weldments in a real structure" in International Journal of Pressure Vessels and Piping, 52, no. 3 (1992):313-335,
https://doi.org/10.1016/0308-0161(92)90089-X . .