基于ABAQUS有限元计算的Al-Mg-Zn铝合金多层焊残余应力预测  

Residual Stress Prediction of Al-Mg-Zn Aluminum Alloy Multi-pass Welding Based on ABAQUS Finite Element Calculation

作　　者：陈逸飞[1] 张晓鸿[1] 陈辉[1] 陈静青[1] 

机构地区：[1]西南交通大学材料科学与工程学院,四川成都610031

出　　处：《热加工工艺》2017年第3期230-234,共5页Hot Working Technology

基　　金：973计划前期研究专项项目(2014CB660807)

摘　　要：针对7系(Al-Mg-Zn)铝合金在不同拘束下三层四道焊的残余应力分析,采用顺序耦合的热弹塑性有限元方法对温度场与不同拘束下的应力场进行了数值计算,并用X-ray残余应力测试仪对实际焊板的纵向残余应力进行了测试。结果表明:应力集中位置位于试板受到约束的位置与焊缝附近,采用实际约束的应力模拟结果与残余应力测量结果基本一致。通过数值模拟计算得出,与两端固定的焊接拘束相比,实际焊接试验的工装约束会产生更高的残余应力水平,而自由拘束条件下的残余应力模拟结果最小。For residual stress analysis of Al-Mg-Zn aluminum alloy in multi-pass welding under different constraint conditions, the numerical calculation of temperature field and stress field with different constraints were carried out by using sequential coupled thermal-stress finite element method. And the longitudinal residual stress of the welding plate was tested with the X-ray residual stress tester. The results show that the maxium stress is located at the restricted positions of test plates and the position near the weld. The stress simulation results with practical constraints are basically consistent with the residual stress measurement. According to the simulation results calculation, compared with the welding constraint, fixed on both ends the actual welding constraint produces higher residual stress, and the simulation results of residual stress are minimal under the free constraint condition.

关 键 词：7系铝合金 多层多道焊 拘束度 残余应力 

分 类 号：TG404[金属学及工艺—焊接]