Analysis of Fatigue Life for Multi-spot Welding

QIN Qiulei; WANG Ruijie; WU Longgang

doi:10.13433/j.cnki.1003-8728.20220193

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Analysis of Fatigue Life for Multi-spot Welding

更新时间：2026-07-10

- Analysis of Fatigue Life for Multi-spot Welding
- Mechanical Science and Technology for Aerospace Engineering Vol. 43, Issue 1, Pages: 90-95(2024)
- 作者机构：
  
  昆明理工大学机电工程学院,昆明,650500
- 作者简介：
- 基金信息：
- DOI：10.13433/j.cnki.1003-8728.20220193
  CLC：
- Online First：25 January 2024，
  
  Published：2024
- 稿件说明：
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QIN Qiulei, WANG Ruijie, WU Longgang. Analysis of Fatigue Life for Multi-spot Welding[J]. Mechanical Science and Technology for Aerospace Engineering, 2024, 43(1): 90-95.
DOI：

QIN Qiulei, WANG Ruijie, WU Longgang. Analysis of Fatigue Life for Multi-spot Welding[J]. Mechanical Science and Technology for Aerospace Engineering, 2024, 43(1): 90-95. DOI： 10.13433/j.cnki.1003-8728.20220193.

摘要

根据ST12钢的双点及三点拉剪电阻点焊试件的恒幅疲劳测试结果，分别使用缺口应力法和等效结构应力法进行疲劳寿命预测。在使用缺口应力法时，按试件的实际尺寸和国际焊接学会(International institute of welding

IIW)推荐标准，分别建立了双点和三点拉剪试件的三维实体有限元模型进行弹性应力分析，从有限元分析结果提取von Mises最大应力变化值，结合IIW推荐标准中的S-N曲线对试件进行疲劳寿命分析预测; 在使用结构应力法时则采用梁壳混合单元进行有限元应力分析，并且根据主S-N曲线进行疲劳寿命预测。结果表明，在低周疲劳范围内，缺口应力法和等效结构应力法预测的结果相对于试件的实际寿命有较好地相关性，其中等效结构应力法的结果更接近实验寿命结果。

Abstract

According to the constant amplitude fatigue test results of ST12 steel double-spot and three-spot tensile shear resistance spot welded specimens

the fatigue lives were predicted by using the notch stress method and equivalent structure stress method respectively. While using notch stress method

the three-dimensional solid finite element models for double-spot and three-spot tensile shear spot weld according to the actual specimen size and the recommendation of International institute of welding(IIW)

the von Mises maximum stress change regime were obtained from the finite element results

the fatigue lives were predicted according to the S-N curve in the IIW recommended standard and while using the structural stress method

a hybrid model for beam and shell stress analysis

then the fatigue lives were predicted according to the main S-N curve. The results showed that the results predicted by using the notch stress method and the equivalent structural stress method are well correlated relatively to the actual lives of the specimen within low cycle regime

where the results by using the equivalent structural stress method are closer to the experimental results.

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