基于动态响应特性的点焊疲劳损伤与寿命预测研究  

A Study on Fatigue Damage and Life Prediction for Spot-welded Joints Based on Dynamic Response Characteristics

作　　者：沈通[1] 尚德广[1] 张芙蓉[2] 王瑞杰[1] 

机构地区：[1]北京工业大学机械工程与应用电子技术学院 [2]大秦铁路股份有限公司,大同037005

出　　处：《汽车工程》2008年第1期72-76,共5页Automotive Engineering

基　　金：北京市自然科学基金项目(3042003)资助

摘　　要：通过动态响应试验对单点点焊接头疲劳过程中固有频率的变化进行研究,查明了最适宜点焊疲劳损伤分析的模态阶数;并利用三维动态有限元模拟了点焊接头疲劳裂纹扩展过程中频率变化特性。最后根据疲劳试验数据,给出了适合于点焊接头的疲劳寿命预测方程。Based on dynamic response tests, the changes in natural frequency of single spot-welded joint in its fatigue damage process are studied with the modal orders most suitable for fatigue damage analysis identified. Then the characteristics of frequency variation during the fatigue crack propagation process are simulated by threedimensional dynamic finite element analysis. Finally, a fatigue life prediction equation for spot-welded joints is given based on fatigue testing data.

关 键 词：点焊疲劳 有限元法 动态响应 固有频率 寿命预测 

分 类 号：TG405[金属学及工艺—焊接]