双相钢搭接点焊接头疲劳寿命分析  

Fatigue life analysis of lap-shear spot weld of dual phase steels

作　　者：许君[1] 张延松[1] 朱平[1] 陈关龙[1] 

机构地区：[1]上海交通大学车身制造技术中心,上海200240

出　　处：《焊接学报》2008年第5期45-48,115,共5页Transactions of The China Welding Institution

基　　金：国家"863"高技术研究发展计划资助项目(2006AA04Z126)

摘　　要：研究了双相钢焊点特征,对不同匹配双相钢搭接焊点进行了疲劳试验,获得了焊点的载荷寿命曲线。研究了双相钢焊点的疲劳裂纹扩展及失效形式,分析和解释了疲劳过程中的现象,并根据裂纹的实际扩展路径,提出了局部等效张开应力强度因子keq,从断裂力学的角度对双相钢焊点的疲劳失效进行了分析。结果表明,keq能够有效地关联具有不同厚度,不同熔核直径的搭接焊点试样的疲劳寿命,是反映双相钢焊点疲劳强度的有效参量,能够用来预测焊点疲劳寿命。Dual phase steel spot weld characteristic was investigated.And then fatigue strength of dual phase steel lap-shear spot weld was tested,the data for spot weld fatigue curve were obtained.The fatigue crack propagation path and failure modes of specimens were also studied.On the basis of crack propagation path local equivalent stress intensity factor keq was applied to analyze the fatigue life of dual phase steel spot weld.The test result indicated that keq was an effective parameter to predict spot weld fati...

关 键 词：双相钢 点焊 疲劳强度 局部等效应力强度因子 

分 类 号：TG407[金属学及工艺—焊接]