多点点焊件疲劳寿命分析

覃秋雷; 王瑞杰; 武陇岗

doi:10.13433/j.cnki.1003-8728.20220193

多点点焊件疲劳寿命分析

doi: 10.13433/j.cnki.1003-8728.20220193

昆明理工大学机电工程学院, 昆明 650500

基金项目:

国家自然科学基金项目 51065012

详细信息

作者简介:
覃秋雷, 硕士研究生, 927599637@qq.com

通讯作者:
王瑞杰, 副教授, 硕士生导师, wrj@kust.edu.cn

中图分类号: TG407
计量
- 文章访问数: 64
- HTML全文浏览量: 20
- PDF下载量: 15
- 被引次数: 0
出版历程
- 收稿日期: 2021-09-23
- 刊出日期: 2024-01-25

Analysis of Fatigue Life for Multi-spot Welding

Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650500, China

摘要

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。
- 电阻点焊 /
- 有限元弹性分析 /
- 缺口应力法 /
- 等效结构应力法 /
- 疲劳寿命
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.
- resistance spot welded /
- finite element elastic analysis /
- notch stress method /
- equivalent structural stress method /
- fatigue life

HTML全文

图 1 试件结构

Figure 1. Specimen structure

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图 2 实验载荷参数图

Figure 2. Experimental load parameters

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图 3 缺口应力法有限元模型

Figure 3. Finite element model of notch stress method

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图 4 等效结构应力法有限元模型

Figure 4. Finite element model of equivalent structural stress method

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图 5 等效结构应力有限元分析应力云图

Figure 5. Finite element analysis of stress cloud nephogram using equivalent structural stress method

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图 6 缺口应力法预测寿命与实验寿命的对比

Figure 6. Comparison between predicted Life and experimental life based on notch stress method

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图 7 试件应力分布

Figure 7. Stress distribution of specimens

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图 8 等效结构应力法预测寿命与实际寿命对比

Figure 8. Comparison between predicted life and experimental life using equivalent structural stress method

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表 1 点焊实验载荷水平与疲劳寿命

Table 1. Load levels and fatigue life of spot welding experiments

载荷幅/N	平均载荷/N	双点焊疲劳寿命/次			三点焊大间距疲劳寿命/次		三点焊小间距疲劳寿命/次
8 000	8 200	848	585	1 323	11 909	7 056	6 735
7 000	7 200	6 945	7 559	8 552	26 958	19 734	26 487
6 000	7 200	6 945	7 559	8 552	42 786	47 658	46 840
5 600	7 200	8 562	10 543	8 775	46 251	50 248	52 460
5 000	7 200	14 140	15 722	13 534	73 887	79 383	68 161
3 600	7 200	54 430	63 016	53 984	229 376	251 980	226 488
3 000	7 200	98 450	109 896	101 643	459 828	482 538	417 399
2 800	7 200	162 688	117 812	142 657	754 388	522 634	494 996

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表 2 主S-N曲线参数表

Table 2. Main S-N curve parameter table

统计数据	C_d	h
中值曲线	19 930.2
+2σ	28 626.5
-2σ	13 875.7	-0.32
+3σ	34 308.1
-3σ	11 577.9

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