【作者】 王瑞杰； 尚德广； 李承山； 孙国芹；

【Author】 WANG Rui-jie,SHANG De-guang,LI Li-sen,LI Cheng-shan (College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology,Beijing 100022,China)

【机构】 北京工业大学机械工程与应用电子技术学院；

【摘要】 对单点与两点焊拉剪点焊疲劳试样分别进行了疲劳试验,观测了疲劳裂纹的形状和萌生位置,分析了两种试样的疲劳性能。通过有限元模型分析了同等栽荷作用下两种试样的变形,对比两种试样的载荷幅寿命关系,认为两点试样的承载能力约为单点试样的两倍。基于此,使用单点试样的载荷幅寿命曲线,预测了两点试样的疲劳寿命,寿命预测结果与实验寿命结果一致。更多还原

【Abstract】 Fatigue tests on tension-shear spot welds of single-spot and two-spot were carried out.The crack initiation location and crack shape were observed.Deformation of two kinds of specimens was analyzed by finite element method. Comparison of the load amplitude-life relationship between two kinds of spot welds showed that the fatigue life of two-spot welds approaches twice of the single-spot specimens.Fatigue lives of two-spot welds were predicted by two load amplitude -life relationship of single-spot.The results showed good agreement with experimental results.更多还原