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。
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.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2005年第8期5-8,共4页
Transactions of The China Welding Institution
基金
国家教育部留学回国人员科研启动金资助项目
关键词
电阻点焊
铝合金
残余应力
疲劳行为
锻压力
Aluminum alloys
Crack propagation
Fatigue of materials
Finite element method
Heat affected zone
Residual stresses
Soldered joints