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Simulation of Spot Weld Pullout by Modeling Failure Around Nugget
Technical Paper
2006-01-0532
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Modeling of spot weld failure is critical in CAE analysis for vehicle crash. Force-based criterion for spot weld nugget interfacial failure is still the most familiar one and commonly used in CAE practice. However, in vehicle crash, spot weld failures often occur in the form of nugget pullout, in which the sheet metal around the nugget, rather than the nugget itself, fails and thus results in the pullout. Compared to the nugget interfacial failure, the pullout mode is more ductile and involves in the materials in and adjacent to the heat-affected-zone (HAZ) around the nugget. In this study, material failures in and adjacent to HAZ are directly modeled using strain-based failure criterion. The model consists of spot weld nugget, HAZ, and base metal (BM). The metal materials inside and outside of HAZ are treated as different materials, and the zones and subzones around the nugget may have different failure strain values. This modeling technique has been correlated with a group of test results found in the literature. The tests include two loading conditions: lap-shear and cross-tension. The tested material is high strength steel HSLA 350.
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Authors
- Jitao Wang - State Key Laboratory of Automotive Safety and Energy, Tsinghua University
- Yong Xia - State Key Laboratory of Automotive Safety and Energy, Tsinghua University
- Qing Zhou - State Key Laboratory of Automotive Safety and Energy, Tsinghua University
- Jinhuan Zhang - State Key Laboratory of Automotive Safety and Energy, Tsinghua University
Citation
Wang, J., Xia, Y., Zhou, Q., and Zhang, J., "Simulation of Spot Weld Pullout by Modeling Failure Around Nugget," SAE Technical Paper 2006-01-0532, 2006, https://doi.org/10.4271/2006-01-0532.Also In
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