应变测量在点焊接头失效分析中的应用  

Application of strain determination method in the failure analysis for resistance spot welding joint

作　　者：祝洪川[1] 吴青松[1] 王有禄[1] 魏星[1] 胡因洪[1] 杨冰[2] 

机构地区：[1]武汉钢铁(集团)公司研究院,湖北武汉430080 [2]东风汽车公司技术中心,湖北武汉430056

出　　处：《钢铁研究》2016年第6期39-41,62,共4页Research on Iron and Steel

摘　　要：电阻点焊接头的失效分析是整车结构强度和碰撞分析中的难点。采用应变测量系统记录和分析了剪切拉伸试验中焊点的破坏过程,分析结果显示:在焊点拔出的失效方式下,破裂点的应变路径为平面应变类型;低速拉伸下的试验速度对应变路径无明显影响,破裂点的断裂应变接近材料的极限应变,应变速率在剪切拉伸过程中呈加速增长趋势。测试分析表明,采用应变分析方法进行点焊接头失效分析是可行的。The failure analysis of resistance spot welding joint is a difficult problem in automobile structural strength and impact simulation.A strain determination system was applied to record and analyse the damage process of shearing tension for spot welding joint.The results showed：in pulled out failure mode of welding spot,the initial damage area had a plane strain path deformation,the tension speed had no obvious effect on strain path,the initial damage area’s fracture strain was comparable with the limit strain of material,the strain rate displayed a quick increase in the whole deformation process.The experiments showed that the application of strain dertermination method for resistance spot welding joint’s failure analysis is feasible.

关 键 词：电阻点焊 应变测量 失效分析 断裂应变 

分 类 号：TG391.7[金属学及工艺—金属压力加工]