汽车后桥悬架臂焊接温度场及残余应力场的预测  

Welding temperature field and residual stress prediction of car's rear suspension arm

作　　者：陈璟[1] 黄承宗[1] 朱剑峰[1] 苑潇涵 覃霍[1] 王华杰[2] 周方明[2] 

机构地区：[1]泛亚汽车技术中心有限公司,上海201201 [2]江苏科技大学江苏省先进焊接技术重点实验室,江苏镇江212003

出　　处：《电焊机》2013年第11期153-157,共5页Electric Welding Machine

摘　　要：以汽车后桥悬架臂为基础,运用ANSYS热-弹塑性有限元方法对其焊接温度场及残余应力场进行了预测。建立了后桥悬架臂的有限元模型,适当选取材料的高温热物理性能和机械性能参数,采用内部生热热源以及生死单元技术模拟焊接热过程,得到了后桥悬架臂各测试点的热循环曲线,然后采用间接耦合的方法预测了其焊接残余应力场,并采用小孔法测量了焊缝近缝区的残余应力。结果表明:各测试点的焊接热过程曲线的实测值与计算值相吻合;焊接残余应力的实测值与计算值有一定的误差,但趋势一致,说明了计算过程的准确性,为进一步预测汽车后桥焊缝承载性能奠定了基础。In this article car＇s rear axle trailing arm is discussed,welding temperature field and welding residual stress field are predicted by ANSYS thermal elastic-plastic finite element method.The finite element model of rear axle suspension arm is established,Material thermal and mechanical property parameters in high temperature are properly chose,welding thermal process is simulated by applying internal heat source and “life-death element＂ technique,thermal cycle curve of each test point is gained,then welding residual stress field is predicted by using indirect coupling method,and residual stress near welding bead is measured by using little hole method.The results show that comparisons of measured and calculated value of each test point have certain tolerance,but the trend is consistent,which explain that the calculation process is accurate,and establish a foundation for further predicting welding bead load-carrying property of car＇s rear axle.

关 键 词：汽车后桥 悬架臂 温度场 焊接残余应力 数值模拟 

分 类 号：TG404[金属学及工艺—焊接]