TY  - JOUR
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
AU  - Međo, Bojan
AU  - Younise, Bashir
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4085
AB  - Micromechanical modelling of ductile fracture by using the local approach has been presented as the review of previously obtained results for welded joints made of low alloyed high strength steel. Experimental work was performed on 3PB specimens and tensile panels, which were then modelled by finite element method, using two- and three-dimensional meshes, respectively. The local approach was used to simulate both for crack initiation and growth during ductile fracture process.
PB  - Savez inženjera metalurgije Srbije, Beograd
T2  - Metallurgical & Materials Engineering
T1  - Micromechanical modelling of ductile fracture - local approach
EP  - 286
IS  - 4
SP  - 265
VL  - 25
DO  - 10.30544/459
ER  - 

@article{
author = "Sedmak, Aleksandar and Rakin, Marko and Međo, Bojan and Younise, Bashir",
year = "2019",
abstract = "Micromechanical modelling of ductile fracture by using the local approach has been presented as the review of previously obtained results for welded joints made of low alloyed high strength steel. Experimental work was performed on 3PB specimens and tensile panels, which were then modelled by finite element method, using two- and three-dimensional meshes, respectively. The local approach was used to simulate both for crack initiation and growth during ductile fracture process.",
publisher = "Savez inženjera metalurgije Srbije, Beograd",
journal = "Metallurgical & Materials Engineering",
title = "Micromechanical modelling of ductile fracture - local approach",
pages = "286-265",
number = "4",
volume = "25",
doi = "10.30544/459"
}

Sedmak, A., Rakin, M., Međo, B.,& Younise, B.. (2019). Micromechanical modelling of ductile fracture - local approach. in Metallurgical & Materials Engineering
Savez inženjera metalurgije Srbije, Beograd., 25(4), 265-286.
https://doi.org/10.30544/459

Sedmak A, Rakin M, Međo B, Younise B. Micromechanical modelling of ductile fracture - local approach. in Metallurgical & Materials Engineering. 2019;25(4):265-286.
doi:10.30544/459 .

Sedmak, Aleksandar, Rakin, Marko, Međo, Bojan, Younise, Bashir, "Micromechanical modelling of ductile fracture - local approach" in Metallurgical & Materials Engineering, 25, no. 4 (2019):265-286,
https://doi.org/10.30544/459 . .

TY  - JOUR
AU  - Younise, Bashir
AU  - Rakin, Marko
AU  - Gubeljak, Nenad
AU  - Međo, Bojan
AU  - Sedmak, Aleksandar
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3635
AB  - The topic of this work is assessment of ductile fracture initiation and development in different zones of welded joint of a high strength low alloyed (HSLA) steel. A combined experimental-numerical procedure is applied for determination of properties of the weld metal and the heat affected zone - HAZ. One tensile specimen with rectangular cross-section is tested, and the surface strains are determined using stereometric 3D measurement (measurement system Gom Aramis with two cameras and software solution). This methodology enabled formation of the stress-strain curves for micromechanical analysis of fracture of specimens with initial fatigue pre-cracks. Two different geometries are considered: standard single-edge notched bend (SENB) specimens and surface-cracked tensile specimens. The cracks were positioned either in weld metal or in HAZ - within the fine-grained part. Micromechanical model (complete Gurson model, by Z.L. Zhang) is applied for assessment of crack growth onset and stable growth. Higher resistance to ductile fracture initiation and crack growth in HAZ is successfully predicted, as well as constraint effect caused by different crack shapes.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Failure Analysis
T1  - Effect of material heterogeneity and constraint conditions on ductile fracture resistance of welded joint zones - Micromechanical assessment
EP  - 445
SP  - 435
VL  - 82
DO  - 10.1016/j.engfailanal.2017.08.006
ER  - 

@article{
author = "Younise, Bashir and Rakin, Marko and Gubeljak, Nenad and Međo, Bojan and Sedmak, Aleksandar",
year = "2017",
abstract = "The topic of this work is assessment of ductile fracture initiation and development in different zones of welded joint of a high strength low alloyed (HSLA) steel. A combined experimental-numerical procedure is applied for determination of properties of the weld metal and the heat affected zone - HAZ. One tensile specimen with rectangular cross-section is tested, and the surface strains are determined using stereometric 3D measurement (measurement system Gom Aramis with two cameras and software solution). This methodology enabled formation of the stress-strain curves for micromechanical analysis of fracture of specimens with initial fatigue pre-cracks. Two different geometries are considered: standard single-edge notched bend (SENB) specimens and surface-cracked tensile specimens. The cracks were positioned either in weld metal or in HAZ - within the fine-grained part. Micromechanical model (complete Gurson model, by Z.L. Zhang) is applied for assessment of crack growth onset and stable growth. Higher resistance to ductile fracture initiation and crack growth in HAZ is successfully predicted, as well as constraint effect caused by different crack shapes.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Failure Analysis",
title = "Effect of material heterogeneity and constraint conditions on ductile fracture resistance of welded joint zones - Micromechanical assessment",
pages = "445-435",
volume = "82",
doi = "10.1016/j.engfailanal.2017.08.006"
}

Younise, B., Rakin, M., Gubeljak, N., Međo, B.,& Sedmak, A.. (2017). Effect of material heterogeneity and constraint conditions on ductile fracture resistance of welded joint zones - Micromechanical assessment. in Engineering Failure Analysis
Pergamon-Elsevier Science Ltd, Oxford., 82, 435-445.
https://doi.org/10.1016/j.engfailanal.2017.08.006

Younise B, Rakin M, Gubeljak N, Međo B, Sedmak A. Effect of material heterogeneity and constraint conditions on ductile fracture resistance of welded joint zones - Micromechanical assessment. in Engineering Failure Analysis. 2017;82:435-445.
doi:10.1016/j.engfailanal.2017.08.006 .

Younise, Bashir, Rakin, Marko, Gubeljak, Nenad, Međo, Bojan, Sedmak, Aleksandar, "Effect of material heterogeneity and constraint conditions on ductile fracture resistance of welded joint zones - Micromechanical assessment" in Engineering Failure Analysis, 82 (2017):435-445,
https://doi.org/10.1016/j.engfailanal.2017.08.006 . .

TY  - JOUR
AU  - Younise, Bashir
AU  - Rakin, Marko
AU  - Gubeljak, Nenad
AU  - Međo, Bojan
AU  - Sedmak, Aleksandar
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3295
AB  - This study deals with the numerical prediction of ductile fracture initiation and development in welded joints of a high strength low alloyed steel. Having in mind the material heterogeneity in the joint zone, a combined experimental-numerical procedure is applied for determination of properties of the weld metal and heat affected zone - HAZ (both coarse-grained and fine-grained portion). Single smooth tensile specimen is tested, and the surface strains are determined during this test using stereometric measurement. Combined with numerical analysis, this enabled determination of stress-strain curves, which are subsequently used in numerical analysis of fracture of pre-cracked specimens. Two different geometries are considered: standard single-edge notched bend (SENB) specimens and surface-cracked tensile specimens. In each of them, the crack is positioned either in weld metal or between the coarse-grained and fine-grained HAZ. Micromechanical model (complete Gurson model, by Z.L. Zhang) is applied in numerical analysis. Higher resistance to ductile fracture initiation and crack growth in HAZ is successfully predicted, as well as constraint effect caused by different crack shapes.
PB  - Elsevier Science Bv, Amsterdam
T2  - 21st European Conference on Fracture, (ECF21)
T1  - Numerical prediction of ductile fracture resistance of welded joint zones
EP  - 760
SP  - 753
VL  - 2
DO  - 10.1016/j.prostr.2016.06.097
ER  - 

@article{
author = "Younise, Bashir and Rakin, Marko and Gubeljak, Nenad and Međo, Bojan and Sedmak, Aleksandar",
year = "2016",
abstract = "This study deals with the numerical prediction of ductile fracture initiation and development in welded joints of a high strength low alloyed steel. Having in mind the material heterogeneity in the joint zone, a combined experimental-numerical procedure is applied for determination of properties of the weld metal and heat affected zone - HAZ (both coarse-grained and fine-grained portion). Single smooth tensile specimen is tested, and the surface strains are determined during this test using stereometric measurement. Combined with numerical analysis, this enabled determination of stress-strain curves, which are subsequently used in numerical analysis of fracture of pre-cracked specimens. Two different geometries are considered: standard single-edge notched bend (SENB) specimens and surface-cracked tensile specimens. In each of them, the crack is positioned either in weld metal or between the coarse-grained and fine-grained HAZ. Micromechanical model (complete Gurson model, by Z.L. Zhang) is applied in numerical analysis. Higher resistance to ductile fracture initiation and crack growth in HAZ is successfully predicted, as well as constraint effect caused by different crack shapes.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "21st European Conference on Fracture, (ECF21)",
title = "Numerical prediction of ductile fracture resistance of welded joint zones",
pages = "760-753",
volume = "2",
doi = "10.1016/j.prostr.2016.06.097"
}

Younise, B., Rakin, M., Gubeljak, N., Međo, B.,& Sedmak, A.. (2016). Numerical prediction of ductile fracture resistance of welded joint zones. in 21st European Conference on Fracture, (ECF21)
Elsevier Science Bv, Amsterdam., 2, 753-760.
https://doi.org/10.1016/j.prostr.2016.06.097

Younise B, Rakin M, Gubeljak N, Međo B, Sedmak A. Numerical prediction of ductile fracture resistance of welded joint zones. in 21st European Conference on Fracture, (ECF21). 2016;2:753-760.
doi:10.1016/j.prostr.2016.06.097 .

Younise, Bashir, Rakin, Marko, Gubeljak, Nenad, Međo, Bojan, Sedmak, Aleksandar, "Numerical prediction of ductile fracture resistance of welded joint zones" in 21st European Conference on Fracture, (ECF21), 2 (2016):753-760,
https://doi.org/10.1016/j.prostr.2016.06.097 . .

TY  - CONF
AU  - Sedmak, Aleksandar
AU  - Younise, Bashir
AU  - Rakin, Marko
AU  - Međo, Bojan
AU  - Gubeljak, Nenad
AU  - Burzić, M.
AU  - Kozak, Drazan
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1974
AB  - Ductile damage development in welded joints of high strength low alloyed (HSLA) steel NIOMOL 490K was examined experimentally and analyzed using the micromechanical approach. Single-edge notched bend (SENB) specimens, cut from the welded plates and subsequently pre-cracked in HAZ and WM, were tested. True stress - true strain curves of the heat-affected zone (HAZ) and weld metal (WM) were determined on the smooth tensile plate specimen, by application of a combined experimental-numerical procedure which included stereometric strain measurement and finite element analysis. The complete Gurson model (CGM) was applied to estimate the fracture behavior of the analyzed zones of the joint. An important property of this model is that critical damage parameter value (used as failure criterion) is not a material constant-it is calculated in every load step, based on the stress and strain state in the structure. This feature is especially important in the examined joints, since the material heterogeneity causes pronounced stress and strain gradients. Finite element software Abaqus was used for numerical analysis. The crack growth initiation was predicted at the moment when damage parameter reaches its critical value in the element nearest to the crack tip. The advance of damage (i.e. the crack growth) was modeled by tracking the loss of load carrying capacity in the ligament (local stiffness reduction in the elements). It is concluded that the micromechanical approach can be used to assess the effects of constraint and heterogeneity on the fracture of the examined HSLA steel welded joints. HAZ fracture properties concerning both crack growth initiation and stable growth are slightly better in comparison with WM, as obtained by testing the SENB specimens with pre-cracks in these two weld zones. The influence of the finite element (FE) size on the results was also analyzed. It is found that the finite element size near the crack tip strongly influences the prediction of crack initiation and growth, and that there is a very significant difference in appropriate FE size between the WM and HAZ. For the analyzed materials, this size corresponds to the mean free path between the non-metallic inclusions in the examined welded joint zones.
PB  - 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012
C3  - 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF
T1  - Ductile fracture resistance of the weld metal and heat affected zone in a HSLA steel welded joint
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1974
ER  - 

@conference{
author = "Sedmak, Aleksandar and Younise, Bashir and Rakin, Marko and Međo, Bojan and Gubeljak, Nenad and Burzić, M. and Kozak, Drazan",
year = "2012",
abstract = "Ductile damage development in welded joints of high strength low alloyed (HSLA) steel NIOMOL 490K was examined experimentally and analyzed using the micromechanical approach. Single-edge notched bend (SENB) specimens, cut from the welded plates and subsequently pre-cracked in HAZ and WM, were tested. True stress - true strain curves of the heat-affected zone (HAZ) and weld metal (WM) were determined on the smooth tensile plate specimen, by application of a combined experimental-numerical procedure which included stereometric strain measurement and finite element analysis. The complete Gurson model (CGM) was applied to estimate the fracture behavior of the analyzed zones of the joint. An important property of this model is that critical damage parameter value (used as failure criterion) is not a material constant-it is calculated in every load step, based on the stress and strain state in the structure. This feature is especially important in the examined joints, since the material heterogeneity causes pronounced stress and strain gradients. Finite element software Abaqus was used for numerical analysis. The crack growth initiation was predicted at the moment when damage parameter reaches its critical value in the element nearest to the crack tip. The advance of damage (i.e. the crack growth) was modeled by tracking the loss of load carrying capacity in the ligament (local stiffness reduction in the elements). It is concluded that the micromechanical approach can be used to assess the effects of constraint and heterogeneity on the fracture of the examined HSLA steel welded joints. HAZ fracture properties concerning both crack growth initiation and stable growth are slightly better in comparison with WM, as obtained by testing the SENB specimens with pre-cracks in these two weld zones. The influence of the finite element (FE) size on the results was also analyzed. It is found that the finite element size near the crack tip strongly influences the prediction of crack initiation and growth, and that there is a very significant difference in appropriate FE size between the WM and HAZ. For the analyzed materials, this size corresponds to the mean free path between the non-metallic inclusions in the examined welded joint zones.",
publisher = "19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012",
journal = "19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF",
title = "Ductile fracture resistance of the weld metal and heat affected zone in a HSLA steel welded joint",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1974"
}

Sedmak, A., Younise, B., Rakin, M., Međo, B., Gubeljak, N., Burzić, M.,& Kozak, D.. (2012). Ductile fracture resistance of the weld metal and heat affected zone in a HSLA steel welded joint. in 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF
19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012..
https://hdl.handle.net/21.15107/rcub_technorep_1974

Sedmak A, Younise B, Rakin M, Međo B, Gubeljak N, Burzić M, Kozak D. Ductile fracture resistance of the weld metal and heat affected zone in a HSLA steel welded joint. in 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF. 2012;.
https://hdl.handle.net/21.15107/rcub_technorep_1974 .

Sedmak, Aleksandar, Younise, Bashir, Rakin, Marko, Međo, Bojan, Gubeljak, Nenad, Burzić, M., Kozak, Drazan, "Ductile fracture resistance of the weld metal and heat affected zone in a HSLA steel welded joint" in 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF (2012),
https://hdl.handle.net/21.15107/rcub_technorep_1974 .

TY  - JOUR
AU  - Younise, Bashir
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
AU  - Gubeljak, Nenad
AU  - Međo, Bojan
AU  - Burzić, M.
AU  - Zrilić, Milorad
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2198
AB  - The objective of this study is determination of the effect of mechanical heterogeneity on ductile crack initiation and propagation in weldments using micromechanical approach. Welded single-edge notched bend (SENB) specimens were experimentally and numerically analysed. Material properties of welded joint zones were estimated using a combined experimental and numerical procedure; strains on a smooth tensile specimen were determined using ARAMIS stereometric measuring system in order to obtain true stress - true strain curves. High-strength low-alloyed steel was used as base metal, in quenched and tempered condition. J-R curves and crack growth initiation values of fracture mechanics parameter were experimentally and numerically obtained for specimens with a pre-crack in the heat-affected zone (HAZ) and weld metal (WM). The complete Gurson model (CGM) was used in prediction of J-R curves and crack growth initiation. It is shown that the resistance to crack initiation and growth can be predicted using micromechanical analysis, and that the results are significantly affected by mechanical heterogeneity of the weldment.
PB  - Elsevier Sci Ltd, Oxford
T2  - Materials & Design
T1  - Micromechanical analysis of mechanical heterogeneity effect on the ductile tearing of weldments
EP  - 201
SP  - 193
VL  - 37
DO  - 10.1016/j.matdes.2012.01.001
ER  - 

@article{
author = "Younise, Bashir and Sedmak, Aleksandar and Rakin, Marko and Gubeljak, Nenad and Međo, Bojan and Burzić, M. and Zrilić, Milorad",
year = "2012",
abstract = "The objective of this study is determination of the effect of mechanical heterogeneity on ductile crack initiation and propagation in weldments using micromechanical approach. Welded single-edge notched bend (SENB) specimens were experimentally and numerically analysed. Material properties of welded joint zones were estimated using a combined experimental and numerical procedure; strains on a smooth tensile specimen were determined using ARAMIS stereometric measuring system in order to obtain true stress - true strain curves. High-strength low-alloyed steel was used as base metal, in quenched and tempered condition. J-R curves and crack growth initiation values of fracture mechanics parameter were experimentally and numerically obtained for specimens with a pre-crack in the heat-affected zone (HAZ) and weld metal (WM). The complete Gurson model (CGM) was used in prediction of J-R curves and crack growth initiation. It is shown that the resistance to crack initiation and growth can be predicted using micromechanical analysis, and that the results are significantly affected by mechanical heterogeneity of the weldment.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Materials & Design",
title = "Micromechanical analysis of mechanical heterogeneity effect on the ductile tearing of weldments",
pages = "201-193",
volume = "37",
doi = "10.1016/j.matdes.2012.01.001"
}

Younise, B., Sedmak, A., Rakin, M., Gubeljak, N., Međo, B., Burzić, M.,& Zrilić, M.. (2012). Micromechanical analysis of mechanical heterogeneity effect on the ductile tearing of weldments. in Materials & Design
Elsevier Sci Ltd, Oxford., 37, 193-201.
https://doi.org/10.1016/j.matdes.2012.01.001

Younise B, Sedmak A, Rakin M, Gubeljak N, Međo B, Burzić M, Zrilić M. Micromechanical analysis of mechanical heterogeneity effect on the ductile tearing of weldments. in Materials & Design. 2012;37:193-201.
doi:10.1016/j.matdes.2012.01.001 .

Younise, Bashir, Sedmak, Aleksandar, Rakin, Marko, Gubeljak, Nenad, Međo, Bojan, Burzić, M., Zrilić, Milorad, "Micromechanical analysis of mechanical heterogeneity effect on the ductile tearing of weldments" in Materials & Design, 37 (2012):193-201,
https://doi.org/10.1016/j.matdes.2012.01.001 . .

TY  - JOUR
AU  - Younise, Bashir
AU  - Rakin, Marko
AU  - Međo, Bojan
AU  - Gubeljak, Nenad
AU  - Kozak, Drazan
AU  - Sedmak, Aleksandar
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1744
AB  - In this paper, constraint effect on ductile fracture initiation and propagation has been studied. Three-dimensional finite element analyses of mismatched welded joints made of high strength steel, have been performed for centre-cracked tensile (CCT) specimens. Different weld widths and material mismatching ratios have been considered. Ductile fracture parameter crack tip opening displacement at crack growth initiation (CTODi), has been obtained for centre-cracked tensile (CCT) specimens using local approach to fracture and compared with experimental results of single edge bend specimens. Micromechanical complete Gurson model has been applied to investigate fracture behaviour of cracked welded joints. Crack tip constraint has been analysed through stress triaxiality in order to study transferability of fracture parameters from one geometry to another
PB  - Faculty of Mechanical Engineering in Slavonski Brod, Faculty of Electrical Engineering in Osijek, Faculty of Civil Engineering in Osijek
T2  - Tehnicki vjesnik
T1  - Numerical analysis of constraint effect on ductile tearing in strength mismatched welded cct specimens using micromechanical approach
EP  - 340
IS  - 3
SP  - 333
VL  - 18
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1744
ER  - 

@article{
author = "Younise, Bashir and Rakin, Marko and Međo, Bojan and Gubeljak, Nenad and Kozak, Drazan and Sedmak, Aleksandar",
year = "2011",
abstract = "In this paper, constraint effect on ductile fracture initiation and propagation has been studied. Three-dimensional finite element analyses of mismatched welded joints made of high strength steel, have been performed for centre-cracked tensile (CCT) specimens. Different weld widths and material mismatching ratios have been considered. Ductile fracture parameter crack tip opening displacement at crack growth initiation (CTODi), has been obtained for centre-cracked tensile (CCT) specimens using local approach to fracture and compared with experimental results of single edge bend specimens. Micromechanical complete Gurson model has been applied to investigate fracture behaviour of cracked welded joints. Crack tip constraint has been analysed through stress triaxiality in order to study transferability of fracture parameters from one geometry to another",
publisher = "Faculty of Mechanical Engineering in Slavonski Brod, Faculty of Electrical Engineering in Osijek, Faculty of Civil Engineering in Osijek",
journal = "Tehnicki vjesnik",
title = "Numerical analysis of constraint effect on ductile tearing in strength mismatched welded cct specimens using micromechanical approach",
pages = "340-333",
number = "3",
volume = "18",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1744"
}

Younise, B., Rakin, M., Međo, B., Gubeljak, N., Kozak, D.,& Sedmak, A.. (2011). Numerical analysis of constraint effect on ductile tearing in strength mismatched welded cct specimens using micromechanical approach. in Tehnicki vjesnik
Faculty of Mechanical Engineering in Slavonski Brod, Faculty of Electrical Engineering in Osijek, Faculty of Civil Engineering in Osijek., 18(3), 333-340.
https://hdl.handle.net/21.15107/rcub_technorep_1744

Younise B, Rakin M, Međo B, Gubeljak N, Kozak D, Sedmak A. Numerical analysis of constraint effect on ductile tearing in strength mismatched welded cct specimens using micromechanical approach. in Tehnicki vjesnik. 2011;18(3):333-340.
https://hdl.handle.net/21.15107/rcub_technorep_1744 .

Younise, Bashir, Rakin, Marko, Međo, Bojan, Gubeljak, Nenad, Kozak, Drazan, Sedmak, Aleksandar, "Numerical analysis of constraint effect on ductile tearing in strength mismatched welded cct specimens using micromechanical approach" in Tehnicki vjesnik, 18, no. 3 (2011):333-340,
https://hdl.handle.net/21.15107/rcub_technorep_1744 .

TY  - JOUR
AU  - Younise, Bashir
AU  - Rakin, Marko
AU  - Gubeljak, Nenad
AU  - Međo, Bojan
AU  - Sedmak, Aleksandar
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1838
AB  - In this paper, two micromechanical models: the Gurson-Tvergaard-Needleman (GTN) model and Complete Gurson Model (CGM) are used to predict ductile fracture initiation of two different welded specimens, SE(B) and C(T). The effect of strength mismatch and weld metal width on fracture initiation is studied also. High strength low-alloyed (HSLA) steel welded specimens are analyzed, with the precrack length/specimen width ratio a0/W = 0.32. Two different weld metals with two different widths: 6 and 12 mm are used to make strength overmatch and undermatch joints. Numerical analysis is done previously to adopt Gurson parameters and to determine the values of critical void volume fraction (fc), which are used in the prediction of crack growth initiation in the two welded specimens. Crack tip opening displacement and J-integral at crack growth initiation (CTODi and Ji) are estimated using the GTN and CGM models. Transferability of fracture initiation parameters (CTODi and Ji) between the two welded specimens is analyzed based on stress triaxiality in front of the crack tip.
AB  - U ovom radu, primenjena su dva mikromehanička modela: Gurson-Tvergard-Nidlman (GTN) model i Potpuni Gurson model (CGM) za procenu inicijacije duktilnog loma kod dve različite zavarene epruvete, SE(B) i C(T). Uticaj mismečinga čvrstoće i širine metala šava na inicijaciju loma je takođe proučen. Analizirani su zavareni uzorci od niskolegiranog čelika povišene čvrstoće (HSLA), sa izvedenom prslinom, dužina prsline/širina epruvete a0/W = 0.32. Upotrebljena su dva različita metala šava sa dve širine: 6 i 12 mm radi izvođenja overmečing i andermečing spojeva. Prethodno je urađena numerička analiza radi usvajanja Gurson parametara i određivanja vrednosti kritičnog zapreminskog udela šupljine (fc), koji su iskorišćeni za predviđanje inicijacije rasta prsline u obe zavarene epruvete. Pomeranje pri otvaranju vrha prsline i J integral pri inicijaciji rasta prsline (CTODi i Ji) su sračunati prema modelima GTN i CGM. Transferabilnost parametara inicijacije loma (CTODi i Ji) između obe zavarene epruvete je analizirana na osnovu troosnosti napona ispred vrha prsline.
PB  - Society for Structural Integrity and Life, Institute for Material Testing
T2  - Integritet i vek konstrukcija
T1  - Numerical simulation of constraint effect on fracture initiation in welded specimens using a local damage model
T1  - Numerička simulacija uticaja veze na inicijaciju loma kod zavarenih epruveta upotrebom modela lokalnog oštećenja
EP  - 56
IS  - 1
SP  - 51
VL  - 11
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1838
ER  - 

@article{
author = "Younise, Bashir and Rakin, Marko and Gubeljak, Nenad and Međo, Bojan and Sedmak, Aleksandar",
year = "2011",
abstract = "In this paper, two micromechanical models: the Gurson-Tvergaard-Needleman (GTN) model and Complete Gurson Model (CGM) are used to predict ductile fracture initiation of two different welded specimens, SE(B) and C(T). The effect of strength mismatch and weld metal width on fracture initiation is studied also. High strength low-alloyed (HSLA) steel welded specimens are analyzed, with the precrack length/specimen width ratio a0/W = 0.32. Two different weld metals with two different widths: 6 and 12 mm are used to make strength overmatch and undermatch joints. Numerical analysis is done previously to adopt Gurson parameters and to determine the values of critical void volume fraction (fc), which are used in the prediction of crack growth initiation in the two welded specimens. Crack tip opening displacement and J-integral at crack growth initiation (CTODi and Ji) are estimated using the GTN and CGM models. Transferability of fracture initiation parameters (CTODi and Ji) between the two welded specimens is analyzed based on stress triaxiality in front of the crack tip., U ovom radu, primenjena su dva mikromehanička modela: Gurson-Tvergard-Nidlman (GTN) model i Potpuni Gurson model (CGM) za procenu inicijacije duktilnog loma kod dve različite zavarene epruvete, SE(B) i C(T). Uticaj mismečinga čvrstoće i širine metala šava na inicijaciju loma je takođe proučen. Analizirani su zavareni uzorci od niskolegiranog čelika povišene čvrstoće (HSLA), sa izvedenom prslinom, dužina prsline/širina epruvete a0/W = 0.32. Upotrebljena su dva različita metala šava sa dve širine: 6 i 12 mm radi izvođenja overmečing i andermečing spojeva. Prethodno je urađena numerička analiza radi usvajanja Gurson parametara i određivanja vrednosti kritičnog zapreminskog udela šupljine (fc), koji su iskorišćeni za predviđanje inicijacije rasta prsline u obe zavarene epruvete. Pomeranje pri otvaranju vrha prsline i J integral pri inicijaciji rasta prsline (CTODi i Ji) su sračunati prema modelima GTN i CGM. Transferabilnost parametara inicijacije loma (CTODi i Ji) između obe zavarene epruvete je analizirana na osnovu troosnosti napona ispred vrha prsline.",
publisher = "Society for Structural Integrity and Life, Institute for Material Testing",
journal = "Integritet i vek konstrukcija",
title = "Numerical simulation of constraint effect on fracture initiation in welded specimens using a local damage model, Numerička simulacija uticaja veze na inicijaciju loma kod zavarenih epruveta upotrebom modela lokalnog oštećenja",
pages = "56-51",
number = "1",
volume = "11",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1838"
}

Younise, B., Rakin, M., Gubeljak, N., Međo, B.,& Sedmak, A.. (2011). Numerical simulation of constraint effect on fracture initiation in welded specimens using a local damage model. in Integritet i vek konstrukcija
Society for Structural Integrity and Life, Institute for Material Testing., 11(1), 51-56.
https://hdl.handle.net/21.15107/rcub_technorep_1838

Younise B, Rakin M, Gubeljak N, Međo B, Sedmak A. Numerical simulation of constraint effect on fracture initiation in welded specimens using a local damage model. in Integritet i vek konstrukcija. 2011;11(1):51-56.
https://hdl.handle.net/21.15107/rcub_technorep_1838 .

Younise, Bashir, Rakin, Marko, Gubeljak, Nenad, Međo, Bojan, Sedmak, Aleksandar, "Numerical simulation of constraint effect on fracture initiation in welded specimens using a local damage model" in Integritet i vek konstrukcija, 11, no. 1 (2011):51-56,
https://hdl.handle.net/21.15107/rcub_technorep_1838 .