TY  - CONF
AU  - Maksimović, Ana
AU  - Petrovski, Blagoj
AU  - Milović, Ljubica
AU  - Zečević, Bojana
AU  - Aleksić, Vujadin
AU  - Bulatović, Srđan
AU  - Bekrić, Dragoljub
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6625
AB  - Most serious weldment failures have catastrophic consequences in terms of damage to other equipment, loss of production, and risks to worker health and safety. For the above reasons, there is a tendency to find the line between safety and disaster, and this requires a guarantee of the integrity of the welded structure even if a crack is present. The structural and mechanical heterogeneity of a welded joint affects its resistance to cracking in both the elastic and plastic regions. Therefore, it is important to define the test method and the position of the fatigue crack. The behavior of an elasto-plastic material, during stable crack growth can be described by the J-Δa diagram. As the crack propagates, a point on the curve is defined, which represents the critical value of the J-integral. The aim of this experiment is to determine JIC value and the procedure is reflected in the determination of the R-curve, i.e., the J‒Δa curve, which consists of the value of the J-integral for uniform crack increments Δa. In this paper, precracked SEN(B) specimens with the fatigue crack positioned in the weld metal (WM) were tested according to standard ASTM E1820 at room temperature (RT), -20 0C and -30 0C.
PB  - Elsevier B.V.
C3  - Procedia Structural Integrity
T1  - Experimental Determination of JIc for a HSLA Steel Welded Joint
EP  - 194
SP  - 190
VL  - 48
DO  - 10.1016/j.prostr.2023.07.147
ER  - 

@conference{
author = "Maksimović, Ana and Petrovski, Blagoj and Milović, Ljubica and Zečević, Bojana and Aleksić, Vujadin and Bulatović, Srđan and Bekrić, Dragoljub",
year = "2023",
abstract = "Most serious weldment failures have catastrophic consequences in terms of damage to other equipment, loss of production, and risks to worker health and safety. For the above reasons, there is a tendency to find the line between safety and disaster, and this requires a guarantee of the integrity of the welded structure even if a crack is present. The structural and mechanical heterogeneity of a welded joint affects its resistance to cracking in both the elastic and plastic regions. Therefore, it is important to define the test method and the position of the fatigue crack. The behavior of an elasto-plastic material, during stable crack growth can be described by the J-Δa diagram. As the crack propagates, a point on the curve is defined, which represents the critical value of the J-integral. The aim of this experiment is to determine JIC value and the procedure is reflected in the determination of the R-curve, i.e., the J‒Δa curve, which consists of the value of the J-integral for uniform crack increments Δa. In this paper, precracked SEN(B) specimens with the fatigue crack positioned in the weld metal (WM) were tested according to standard ASTM E1820 at room temperature (RT), -20 0C and -30 0C.",
publisher = "Elsevier B.V.",
journal = "Procedia Structural Integrity",
title = "Experimental Determination of JIc for a HSLA Steel Welded Joint",
pages = "194-190",
volume = "48",
doi = "10.1016/j.prostr.2023.07.147"
}

Maksimović, A., Petrovski, B., Milović, L., Zečević, B., Aleksić, V., Bulatović, S.,& Bekrić, D.. (2023). Experimental Determination of JIc for a HSLA Steel Welded Joint. in Procedia Structural Integrity
Elsevier B.V.., 48, 190-194.
https://doi.org/10.1016/j.prostr.2023.07.147

Maksimović A, Petrovski B, Milović L, Zečević B, Aleksić V, Bulatović S, Bekrić D. Experimental Determination of JIc for a HSLA Steel Welded Joint. in Procedia Structural Integrity. 2023;48:190-194.
doi:10.1016/j.prostr.2023.07.147 .

Maksimović, Ana, Petrovski, Blagoj, Milović, Ljubica, Zečević, Bojana, Aleksić, Vujadin, Bulatović, Srđan, Bekrić, Dragoljub, "Experimental Determination of JIc for a HSLA Steel Welded Joint" in Procedia Structural Integrity, 48 (2023):190-194,
https://doi.org/10.1016/j.prostr.2023.07.147 . .

TY  - CONF
AU  - Milović, Ljubica
AU  - Sedmak, Aleksandar
AU  - Blačić, Ivo
AU  - Vuherer, Tomaž
AU  - Petrovski, Blagoj
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6428
AB  - In order to assess the integrity of welded pressure vessel containing a crack, the behavior of three-point bending specimens made of HSLA steel welded joint are tested at -40 °C, and their fracture behaviour analyzed, as a conservative measure of crack resistance. Specimens were made of low-alloyed steel NIONIKRAL 70, welded by SAW process. Surface notches were machined by the electro-erosion method in the parent metal (PM), heat affected zone (HAZ) and weld metal (WM). The highest resistance to cracking was in PM, and the lowest one in WM, due to so-called pop-in behaviour.
PB  - Elsevier B.V.
C3  - 23rd European Conference on Fracture, ECF 2022, Procedia Structural Integrity
T1  - Experimental Analysis of HSLA Steel Welded Joint Fracture Behaviour
EP  - 1502
SP  - 1497
VL  - 42
DO  - 10.1016/j.prostr.2022.12.190
ER  - 

@conference{
author = "Milović, Ljubica and Sedmak, Aleksandar and Blačić, Ivo and Vuherer, Tomaž and Petrovski, Blagoj",
year = "2022",
abstract = "In order to assess the integrity of welded pressure vessel containing a crack, the behavior of three-point bending specimens made of HSLA steel welded joint are tested at -40 °C, and their fracture behaviour analyzed, as a conservative measure of crack resistance. Specimens were made of low-alloyed steel NIONIKRAL 70, welded by SAW process. Surface notches were machined by the electro-erosion method in the parent metal (PM), heat affected zone (HAZ) and weld metal (WM). The highest resistance to cracking was in PM, and the lowest one in WM, due to so-called pop-in behaviour.",
publisher = "Elsevier B.V.",
journal = "23rd European Conference on Fracture, ECF 2022, Procedia Structural Integrity",
title = "Experimental Analysis of HSLA Steel Welded Joint Fracture Behaviour",
pages = "1502-1497",
volume = "42",
doi = "10.1016/j.prostr.2022.12.190"
}

Milović, L., Sedmak, A., Blačić, I., Vuherer, T.,& Petrovski, B.. (2022). Experimental Analysis of HSLA Steel Welded Joint Fracture Behaviour. in 23rd European Conference on Fracture, ECF 2022, Procedia Structural Integrity
Elsevier B.V.., 42, 1497-1502.
https://doi.org/10.1016/j.prostr.2022.12.190

Milović L, Sedmak A, Blačić I, Vuherer T, Petrovski B. Experimental Analysis of HSLA Steel Welded Joint Fracture Behaviour. in 23rd European Conference on Fracture, ECF 2022, Procedia Structural Integrity. 2022;42:1497-1502.
doi:10.1016/j.prostr.2022.12.190 .

Milović, Ljubica, Sedmak, Aleksandar, Blačić, Ivo, Vuherer, Tomaž, Petrovski, Blagoj, "Experimental Analysis of HSLA Steel Welded Joint Fracture Behaviour" in 23rd European Conference on Fracture, ECF 2022, Procedia Structural Integrity, 42 (2022):1497-1502,
https://doi.org/10.1016/j.prostr.2022.12.190 . .

TY  - JOUR
AU  - Milović, Ljubica
AU  - Petrovski, Blagoj
AU  - Vuherer, Tomaz
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4142
AB  - This paper presents a method for estimating the residual-strength of welded pressure vessel made of HSLA steel which contains a surface axial crack. In order to analyze the behavior of the structure, a set of specimens were extracted from the welded plates using the same welding procedure as used for welding of the vessel. Before the fatigue precracking, the notches were positioned in parent material, heat-affected zone and weld metal of standard bend specimens. The J-integral resistance curve method for residual strength prediction comprises the following steps: 1. Obtaining of root J(R) resistance curves for the pressure vessel material using convenient specimens; 2. Obtaining root J crack driving force curves for the investigated structure for different crack sizes and different levels of applied stresses by applying the appropriate model of plasticity (Dugdale model); 3. Determination of the instability point as the tangency point between the crack driving force curve and the resistance curve. J-resistance curve of welded joint constituents were determined at -40 degrees C using a single specimen compliance procedure.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Failure Analysis
T1  - Estimation of residual strength of a crack-containing welded pressure vessel exposed to a subzero operating temperature
VL  - 106
DO  - 10.1016/j.engfailanal.2019.104167
ER  - 

@article{
author = "Milović, Ljubica and Petrovski, Blagoj and Vuherer, Tomaz",
year = "2019",
abstract = "This paper presents a method for estimating the residual-strength of welded pressure vessel made of HSLA steel which contains a surface axial crack. In order to analyze the behavior of the structure, a set of specimens were extracted from the welded plates using the same welding procedure as used for welding of the vessel. Before the fatigue precracking, the notches were positioned in parent material, heat-affected zone and weld metal of standard bend specimens. The J-integral resistance curve method for residual strength prediction comprises the following steps: 1. Obtaining of root J(R) resistance curves for the pressure vessel material using convenient specimens; 2. Obtaining root J crack driving force curves for the investigated structure for different crack sizes and different levels of applied stresses by applying the appropriate model of plasticity (Dugdale model); 3. Determination of the instability point as the tangency point between the crack driving force curve and the resistance curve. J-resistance curve of welded joint constituents were determined at -40 degrees C using a single specimen compliance procedure.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Failure Analysis",
title = "Estimation of residual strength of a crack-containing welded pressure vessel exposed to a subzero operating temperature",
volume = "106",
doi = "10.1016/j.engfailanal.2019.104167"
}

Milović, L., Petrovski, B.,& Vuherer, T.. (2019). Estimation of residual strength of a crack-containing welded pressure vessel exposed to a subzero operating temperature. in Engineering Failure Analysis
Pergamon-Elsevier Science Ltd, Oxford., 106.
https://doi.org/10.1016/j.engfailanal.2019.104167

Milović L, Petrovski B, Vuherer T. Estimation of residual strength of a crack-containing welded pressure vessel exposed to a subzero operating temperature. in Engineering Failure Analysis. 2019;106.
doi:10.1016/j.engfailanal.2019.104167 .

Milović, Ljubica, Petrovski, Blagoj, Vuherer, Tomaz, "Estimation of residual strength of a crack-containing welded pressure vessel exposed to a subzero operating temperature" in Engineering Failure Analysis, 106 (2019),
https://doi.org/10.1016/j.engfailanal.2019.104167 . .

TY  - CONF
AU  - Petrovski, Blagoj
AU  - Sedmak, Aleksandar
AU  - Swei, M.
AU  - Milović, Ljubica
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3484
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  - 14th International Conference on Fracture, ICF 2017
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 = "14th International Conference on Fracture, ICF 2017",
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
14th International Conference on Fracture, ICF 2017., 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  - Milović, Ljubica
AU  - Milošević-Mitić, Vesna
AU  - Radaković, Zoran
AU  - Anđelić, Nina
AU  - Petrovski, Blagoj
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2296
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.
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.
PB  - Society for Structural Integrity and Life, Institute for Material Testing
T2  - Integritet i vek konstrukcija
T1  - Assessment of pressure vessel load capacity in the presence of cracks
T1  - Procena nosivosti posude pod pritiskom u prisustvu prsline
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 = "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., 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.",
publisher = "Society for Structural Integrity and Life, Institute for Material Testing",
journal = "Integritet i vek konstrukcija",
title = "Assessment of pressure vessel load capacity in the presence of cracks, Procena nosivosti posude pod pritiskom u prisustvu prsline",
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). Assessment of pressure vessel load capacity in the presence of cracks. in Integritet i vek konstrukcija
Society for Structural Integrity and Life, Institute for Material Testing., 13(1), 9-16.
https://hdl.handle.net/21.15107/rcub_technorep_2296

Milović L, Milošević-Mitić V, Radaković Z, Anđelić N, Petrovski B. Assessment of pressure vessel load capacity in the presence of cracks. 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, "Assessment of pressure vessel load capacity in the presence of cracks" 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, Tomaz
AU  - Radaković, Zoran
AU  - Petrovski, Blagoj
AU  - Janković, Miodrag
AU  - Zrilić, Milorad
AU  - Daničić, Darko
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1840
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.
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.
PB  - Society for Structural Integrity and Life, Institute for Material Testing
T2  - 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_technorep_1840
ER  - 

@article{
author = "Milović, Ljubica and Vuherer, Tomaz and Radaković, Zoran and Petrovski, Blagoj and Janković, Miodrag and Zrilić, Milorad and Daničić, Darko",
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 DKth 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 DKth i na parametre Parisove relacije.",
publisher = "Society for Structural Integrity and Life, Institute for Material Testing",
journal = "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_technorep_1840"
}

Milović, L., Vuherer, T., Radaković, Z., Petrovski, B., Janković, M., Zrilić, M.,& Daničić, D.. (2011). Determination of fatigue crack growth parameters in welded joint of HSLA steel. in Integritet i vek konstrukcija
Society for Structural Integrity and Life, Institute for Material Testing., 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. Determination of fatigue crack growth parameters in welded joint of HSLA steel. in Integritet i vek konstrukcija. 2011;11(3):183-187.
https://hdl.handle.net/21.15107/rcub_technorep_1840 .

Milović, Ljubica, Vuherer, Tomaz, Radaković, Zoran, Petrovski, Blagoj, Janković, Miodrag, Zrilić, Milorad, Daničić, Darko, "Determination of fatigue crack growth parameters in welded joint of HSLA steel" in Integritet i vek konstrukcija, 11, no. 3 (2011):183-187,
https://hdl.handle.net/21.15107/rcub_technorep_1840 .