PSI - Issue 33

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Procedia Structural Integrity 33 (2021) 850–857

IGF26 - 26th International Conference on Fracture and Structural Integrity Numerical simulation of crack growth in a welded joint with defects M. Aranđelović a , S. Sedmak a , R. Jovičić a , D. Kozak b , B. Đorđević a IGF26 - 26th International Conference on Fracture and Structural Integrity Numerical simulation of crack growth in a welded joint with defects M. Aranđelović a , S. Sedmak a , R. Jovičić a , D. Kozak b , B. Đorđević a

a Innovation Centre of the Faculty of Mechanical Engineering, Belgrade, Serbia b University of Slavonski Brod, Faculty of Mechanical Engineering, Croatia a Innovation Centre of the Faculty of Mechanical Engineering, Belgrade, Serbia b University of Slavonski Brod, Faculty of Mecha ical Engineering, Croatia

© 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the IGF ExCo Abstract Research presented in this paper involves the numerical simulation of crack growth in a welded joint made of common structural steel S235JR2, but with the presence of a number of different welding defects, which represents a scenario that is not covered by relevant standards, in this case EN ISO 5817. After analysing several defect combinations, which could occur in reality, the one with the least favourable combination of stress concentration and plastic strain was selected as the relevant model. A crack was then introduced in the location where the stresses, caused by tensile loading of the welded joint model, were above the yield stress. The numerical analysis performed in this case involved different combinations of load magnitudes and crack length, in order to determine at which point the initial crack will start propagating. © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo Keywords: welded joint; defects; finite element method; crack growth; steel S235JR2 1. Introduction Defects in welded joint are inevitable, due to structural, metallurgical and other reasons, and their occurrence can significantly decrease the work life of a welded joint/structure, and in the worst case, it could lead to failure [Aran đelović (2020) , Tanasković (2018) ]. The frequency and size of these defects can be decreased to an acceptable minimum by using proper welding procedures, materials and heat treatment. Standard EN ISO 5817 (2015), which defines the acceptability criteria for welded joint defects only considers one type of defect in a welded joint, and does not fully take into account the integrity of the welded joint. Particular problems occur due to residual stresses which can cause stress concentration and result in crack initiation in the cases of inadequate welded joint geometry, as can be seen in the works of R. Jo vičić (2015) and S. Sedmak (2018). In this particular case, a number of different defect combinations were simulated on welded plates, and numerical models were later developed in order to determine the stress distribution of such welded joints under tensile loads. All of the defects which were intentionally introduced to the welded joints were defined and selected in accordance Abstract Research presented in this paper involves the numerical simulation of crack growth in a welded joint made of common structural st el S235JR2, but with the pr se ce of a number of different welding defects, hich repr sents a scenario that is not covered by rel vant standards, in t is case EN ISO 5817. After analysi g s veral combinations, which could ccur in reality, th one with the le st favourable combination of stress conce tration and plastic strain was selected as t e relevant model. A crack was then introduced in the lo ation where the stresses, caused by tensile loading of the welded joint model, were above the yield str ss. The numerical analysis perfo med in thi case involved different combina ions of load magnitudes and crack length, in o der to d ter ine at which point the initial crack will start propagating. © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review Statem nt: Peer-revi w under responsibility of the scientific committee of the IGF ExCo K ywords: elded joint; def cts; finit element meth d; crack growt ; teel S235JR2 1. Introduction Defects in welded joint are inevitable, due to structural, metallurgical and other reasons, and their occurrence can significantly decrease the work life of a welded joint/structure, and in the worst case it could lead to failure [Aran đelović (2020) , Tanask vić (2018) ]. Th fr quency and siz of these defects can be decreased to n acceptabl minimum by using proper welding procedures, materials heat treatm nt. Stand rd EN ISO 5817 (2015), which defines the acceptability crit ria for wel ed joint d fects only considers one type of defect in a welded joint, and oes no fully take into a count the int grity f the w lded joint. Particular probl ms occur due to residual stresses which can cause stress con entration and result in crack initiation in the c ses f inadequate welded jo nt geometry, as can be seen in th works of R. J vičić (2015) and S. Sedm k (2018). In this particular case, a number of different defect combinations were simulated on welded plates, and numerical models were later developed in order to det rmine the stress d stribution of such welded joints under tensile loads. All of the d fects which w re intentionally introduced to the welded joi ts were defined and selected in accordance

2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo 2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo

2452-3216 © 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the IGF ExCo 10.1016/j.prostr.2021.10.095