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| 锻压力对铝合金点焊接头疲劳行为的影响 |
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常保华1, 都东1, 岁波1, Z. Wang2, Y. Zhou3
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1.清华大学机械工程系, 清华大学先进成形制造重点实验室, 北京 100084;2.Dept. of Materials Science and Engineering, University of Toronto, Toronto, Ontario, M5S 1A4, Canada;3.Dept. of Mechanical Engineering, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada
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| 摘要: |
| 采用试验和有限元分析相结合的方法,考察了锻压力对铝合金电阻点焊接头中残余应力和接头疲劳行为的影响。结果表明,采用锻压力显著降低了熔核边缘外部热影响区中的残余应力,疲劳裂纹不再从热影响区中萌生,而是全部从熔核边缘处开始;残余应力的降低使得疲劳裂纹扩展的驱动力减小,接头的疲劳强度提高。 |
| 关键词: 电阻点焊 铝合金 残余应力 疲劳行为 锻压力 |
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| 基金项目:国家教育部留学回国人员科研启动金资助项目 |
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| Effect of forging force on fatigue behavior of spot-welded joints of aluminium alloy |
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CHANG Bao-hua1, DU Dong1, SUI Bo1, Z. Wang2, Y. Zhou3
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1.Department of Mechanical Engineering, Key Laboratory for Advanced Manufacturing by Materials Processing Technology, Tsinghua University, Beijing, 100084, China;2.Dept. of Materials Science and Engineering, University of Toronto, Toronto, Ontario, M5S 1A4, Canada;3.Dept. of Mechanical Engineering, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada
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| Abstract: |
| Using experimental and finite element analysis methods, the effects of electrode forging force are investigated on residual stress and fatigue behavior of spot welded aluminum alloy joints. Results show that forging force significantly reduces the residual stresses in the heat affected zone (HAZ); the fatigue cracks no longer initiate from the HAZ, while all cracks begin from the edge of nuggets. The mitigation of residual stress decreases the driving force for crack propagation, and leads to higher fatigue strength. |
| Key words: resistance spot welding aluminum alloys residual stress fatigue behavior forging force |
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