【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载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