搅拌摩擦点焊接头拉伸-剪切行为的等效建模

doi:10.13229/j.cnki.jdxbgxb20200503

摘要/Abstract

摘要：

针对车身焊点最主要的拉伸-剪切载荷的仿真，提出了内聚力焊点模型（CZWM）的等效建模方法。通过单焊点接头的剪切和多角度拉伸对焊点的初始损伤和断裂能进行测定，建立接头的等效模型。该模型与单焊点接头的拉伸-剪切过程相吻合。同时，通过3种双焊点接头对CZWM的有效性进行了验证。结果表明：CZWM在拉伸-剪切失效载荷（TSFL）和失效位移（FD）的最大偏差分别为9.3%和7.1%；双焊点接头的焊点分布与外载荷方向平行时接头承载最强，垂直时承载最差，斜交居中。该模型为车身FSSW焊点力学行为的数值模拟提供了一种选择。

关键词: 车辆工程, 搅拌摩擦点焊, 内聚力焊点模型, 拉伸-剪切行为, 失效载荷, 焊点分布

Abstract:

In this paper, an equivalent modeling method of the cohesive zone weld model (CZWM) is proposed for the simulation of the most dominant tensile-shear loads in automotive body welds. Based on the measurement results of the initial damage and fracture energy from single spot weld joints through tensile-shear and multi-angle tension, an equivalent model of the joint is established. The model is in good agreement with the experimental results of the single spot weld joint in tensile-shear process. At the same time, the effectiveness of the CZWM is verified by three kinds of double weld joints. The results show that the maximum deviation of CZWM in tensile-shear failure load (TSFL) and failure displacement (FD) is 9.3% and 7.1% respectively. When the distribution of welds is parallel to the direction of the external load, the bearing capacity is the highest, the vertical is the lowest, and the diagonal is in the middle. This model provides an option for the numerical simulation of the mechanical behavior in automotive body FSSW welds.

Key words: vehicle engineering, friction stir spot welding, cohesive zone weld model, tensile-shear behavior, failure load, welds distribution

中图分类号:

陈鑫,于贵申,张彪,潘凯旋,杨立飞. 搅拌摩擦点焊接头拉伸-剪切行为的等效建模[J]. 吉林大学学报(工学版), 2021, 51(4): 1190-1197.

Xin CHEN,Gui-shen YU,Biao ZHANG,Kai-xuan PAN,Li-fei YANG. Equivalent modeling of tensile-shear behavior for friction stir spot welding joints[J]. Journal of Jilin University(Engineering and Technology Edition), 2021, 51(4): 1190-1197.

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