Elasto-plastic contact, electric current and thermal conduction triply coupled analysis model for resistance spot welding

被引：0
作者：
Niho, Tomoya [1 ]
Horie, Tomoyoshi [1 ]
Morita, Yusuke [1 ]
Ishihara, Daisuke [1 ]
Yamakawa, Daisuke [2 ]
Momii, Shinji [2 ]
机构：
[1] Kyushu Institute of Technology, Graduate School of Computer Science and Systems Engineering
[2] Toyota Motor Kyushu, Inc
来源：
Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society | 2015年 / 33卷 / 03期
关键词：
Elasto-plastic contact; Electric current and heat conduction coupled finite element analysis; Electrical contact resistance; Iterative partitioned coupled algorithm; Joule heat generation; Latent heat; Non-linear transient triply coupled problem; Resistance spot welding; Temperature dependent material property; Thermal contact resistance;
D O I：
10.2207/qjjws.33.271
中图分类号：
学科分类号：
摘要：
Interactions between elasto-plastic contact deformation, electric current and heat conduction produces complicated triply coupled effect in the resistant spot welding. Since the coupled effect affects weld strength, the coupled finite element analysis is required to determine welding parameters such as welding current, electrode force, welding time and electrode shape. This paper discusses in detail the elasto-plastic contact, electric current and thermal conduction triply coupled analysis method. The coupled analysis method uses modified electrical contact resistance model, modified thermal contact resistance model and iterative partitioned coupled algorithm suitable for strong coupled problem. The validity of the method are discussed under the different condition such as welding current, electrode force, welding time, material and number of the steel sheets. The analysis result of nugget growth curve agrees very well with experimental result for two sheet welding. The validity is confirmed by not only nugget growth curve but also surface temperature of steel sheet and electrode for three sheet welding with high tension steel. The solution convergence is discussed for the iterative partitioned coupled algorithm and the conventional coupled algorithm. Since the coupled effect is strong for between electric current and thermal conduction, the choice of the coupled algorithm is important for the resistance spot welding analysis. Effect of elasto-plastic contact deformation, change of electric current distribution and thermal conduction on resistance spot welding are discussed from the viewpoint of coupled effect. The coupled model with ability to simulate the chain of coupled effect is required to improve the analysis reliability. The importance of temperature dependency of material property, electrical contact resistance, thermal contact resistance and latent heat effect are also discussed.
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页码：271 / 282
页数：11
相关论文
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