Numerical and Experimental Investigations of Fracture Behaviour of Welded Joints with Multiple Defects
2021
Аутори
Aranđelović, MihajloSedmak, Simon
Jovičić, Radomir
Perković, Srđa
Burzić, Zijah
Radu, Dorin
Radaković, Zoran
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
Current standards related to welded joint defects (EN ISO 5817) only consider individual cases (i.e., single defect in a welded joint). The question remains about the behaviour of a welded joint in the simultaneous presence of several different types of defects, so-called multiple defects, which is the topic of this research. The main focus is on defects most commonly encountered in practice, such as linear misalignments, undercuts, incomplete root penetration, and excess weld metal. The welding procedure used in this case was metal active gas welding, a common technique when it comes to welding low-alloy low-carbon steels, including those used for pressure equipment. Different combinations of these defects were deliberately made in welded plates and tested in a standard way on a tensile machine, along with numerical simulations using the finite element method (FEM), based on real geometries. The goal was to predict the behaviour in terms of stress concentrations caused by geometry and... affected by multiple defects and material heterogeneity. Numerical and experimental results were in good agreement, but only after some modifications of numerical models. The obtained stress values in the models ranged from noticeably lower than the yield stress of the used materials to slightly higher than it, suggesting that some defect combinations resulted in plastic strain, whereas other models remained in the elastic area. The stress-strain diagram obtained for the first group (misalignment, undercut, and excess root penetration) shows significantly less plasticity. Its yield stress is very close to its ultimate tensile strength, which in turn is noticeably lower compared with the other three groups. This suggests that welded joints with misalignment and incomplete root penetration are indeed the weakest of the four groups either due to the combination of the present defects or perhaps because of an additional unseen internal defect. From the other three diagrams, it can be concluded that the test specimens show very similar behaviour with nearly identical ultimate tensile strengths and considerable plasticity. The diagrams shows the most prominent yielding, with an easily distinguishable difference between the elastic and plastic regions. The diagrams are the most similar, having the same strain of around 9% and with a less obvious yield stress limit.
Кључне речи:
welded joint / stress concentration / multiple defects / finite element method (FEM)Извор:
Materials, 2021, 14, 17Издавач:
- MDPI, Basel
Финансирање / пројекти:
- Министарство науке, технолошког развоја и иновација Републике Србије, институционално финансирање - 200135 (Универзитет у Београду, Технолошко-металуршки факултет) (RS-MESTD-inst-2020-200135)
- Министарство науке, технолошког развоја и иновација Републике Србије, институционално финансирање - 200213 (Иновациони центар Машинског факултета у Београду доо) (RS-MESTD-inst-2020-200213)
DOI: 10.3390/ma14174832
ISSN: 1996-1944
PubMed: 34500921
WoS: 000694471900001
Scopus: 2-s2.0-85114008172
Институција/група
Inovacioni centarTY - JOUR AU - Aranđelović, Mihajlo AU - Sedmak, Simon AU - Jovičić, Radomir AU - Perković, Srđa AU - Burzić, Zijah AU - Radu, Dorin AU - Radaković, Zoran PY - 2021 UR - https://machinery.mas.bg.ac.rs/handle/123456789/3530 AB - Current standards related to welded joint defects (EN ISO 5817) only consider individual cases (i.e., single defect in a welded joint). The question remains about the behaviour of a welded joint in the simultaneous presence of several different types of defects, so-called multiple defects, which is the topic of this research. The main focus is on defects most commonly encountered in practice, such as linear misalignments, undercuts, incomplete root penetration, and excess weld metal. The welding procedure used in this case was metal active gas welding, a common technique when it comes to welding low-alloy low-carbon steels, including those used for pressure equipment. Different combinations of these defects were deliberately made in welded plates and tested in a standard way on a tensile machine, along with numerical simulations using the finite element method (FEM), based on real geometries. The goal was to predict the behaviour in terms of stress concentrations caused by geometry and affected by multiple defects and material heterogeneity. Numerical and experimental results were in good agreement, but only after some modifications of numerical models. The obtained stress values in the models ranged from noticeably lower than the yield stress of the used materials to slightly higher than it, suggesting that some defect combinations resulted in plastic strain, whereas other models remained in the elastic area. The stress-strain diagram obtained for the first group (misalignment, undercut, and excess root penetration) shows significantly less plasticity. Its yield stress is very close to its ultimate tensile strength, which in turn is noticeably lower compared with the other three groups. This suggests that welded joints with misalignment and incomplete root penetration are indeed the weakest of the four groups either due to the combination of the present defects or perhaps because of an additional unseen internal defect. From the other three diagrams, it can be concluded that the test specimens show very similar behaviour with nearly identical ultimate tensile strengths and considerable plasticity. The diagrams shows the most prominent yielding, with an easily distinguishable difference between the elastic and plastic regions. The diagrams are the most similar, having the same strain of around 9% and with a less obvious yield stress limit. PB - MDPI, Basel T2 - Materials T1 - Numerical and Experimental Investigations of Fracture Behaviour of Welded Joints with Multiple Defects IS - 17 VL - 14 DO - 10.3390/ma14174832 ER -
@article{ author = "Aranđelović, Mihajlo and Sedmak, Simon and Jovičić, Radomir and Perković, Srđa and Burzić, Zijah and Radu, Dorin and Radaković, Zoran", year = "2021", abstract = "Current standards related to welded joint defects (EN ISO 5817) only consider individual cases (i.e., single defect in a welded joint). The question remains about the behaviour of a welded joint in the simultaneous presence of several different types of defects, so-called multiple defects, which is the topic of this research. The main focus is on defects most commonly encountered in practice, such as linear misalignments, undercuts, incomplete root penetration, and excess weld metal. The welding procedure used in this case was metal active gas welding, a common technique when it comes to welding low-alloy low-carbon steels, including those used for pressure equipment. Different combinations of these defects were deliberately made in welded plates and tested in a standard way on a tensile machine, along with numerical simulations using the finite element method (FEM), based on real geometries. The goal was to predict the behaviour in terms of stress concentrations caused by geometry and affected by multiple defects and material heterogeneity. Numerical and experimental results were in good agreement, but only after some modifications of numerical models. The obtained stress values in the models ranged from noticeably lower than the yield stress of the used materials to slightly higher than it, suggesting that some defect combinations resulted in plastic strain, whereas other models remained in the elastic area. The stress-strain diagram obtained for the first group (misalignment, undercut, and excess root penetration) shows significantly less plasticity. Its yield stress is very close to its ultimate tensile strength, which in turn is noticeably lower compared with the other three groups. This suggests that welded joints with misalignment and incomplete root penetration are indeed the weakest of the four groups either due to the combination of the present defects or perhaps because of an additional unseen internal defect. From the other three diagrams, it can be concluded that the test specimens show very similar behaviour with nearly identical ultimate tensile strengths and considerable plasticity. The diagrams shows the most prominent yielding, with an easily distinguishable difference between the elastic and plastic regions. The diagrams are the most similar, having the same strain of around 9% and with a less obvious yield stress limit.", publisher = "MDPI, Basel", journal = "Materials", title = "Numerical and Experimental Investigations of Fracture Behaviour of Welded Joints with Multiple Defects", number = "17", volume = "14", doi = "10.3390/ma14174832" }
Aranđelović, M., Sedmak, S., Jovičić, R., Perković, S., Burzić, Z., Radu, D.,& Radaković, Z.. (2021). Numerical and Experimental Investigations of Fracture Behaviour of Welded Joints with Multiple Defects. in Materials MDPI, Basel., 14(17). https://doi.org/10.3390/ma14174832
Aranđelović M, Sedmak S, Jovičić R, Perković S, Burzić Z, Radu D, Radaković Z. Numerical and Experimental Investigations of Fracture Behaviour of Welded Joints with Multiple Defects. in Materials. 2021;14(17). doi:10.3390/ma14174832 .
Aranđelović, Mihajlo, Sedmak, Simon, Jovičić, Radomir, Perković, Srđa, Burzić, Zijah, Radu, Dorin, Radaković, Zoran, "Numerical and Experimental Investigations of Fracture Behaviour of Welded Joints with Multiple Defects" in Materials, 14, no. 17 (2021), https://doi.org/10.3390/ma14174832 . .