摘要
采用ANSYS有限元软件,建立了钢/铝异种金属光纤激光熔钎焊有限元模型,并采用熔池边界准则验证了其准确性,在此基础上计算了工件的应力与变形.结果表明,工件上的纵向峰值拉应力出现在焊缝底部热源后方的钢母材一侧,随着焊接过程的持续进行,其数值不断增大,焊接结束瞬间(13 s)达到最大值203 MPa;工件上的应力场呈不对称分布,热源附近区域存在较大应力梯度;工件最大变形量为0.882 mm.
In this paper,a finite element model of fiber laser welding-brazing process for steel / Al dissimilar metals was established by ANSYS. The accuracy of the finite element model was verified by fusion zone boundary criteria. The stress field and welding deformation were simulated based on this mode. The results showed that the peak tensile stress along welding direction appeared on the lower surface of the steel and near the welds behind the heat source. This peak tensile stress increased continually with the welding process continued and it reached a maximum of 203 MPa when welding finished( 13s). The stress distribution was asymmetric and there was high stress gradient close to the heat source. The maximum deformation of the specimen was 0. 882 mm.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2015年第10期21-24,114,共4页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(51475040)
中央高校基本科研业务费专项资金资助项目(FRF-TP-14-007A2)
关键词
激光熔钎焊
钢/铝异种金属
数值模拟
峰值应力
laser welding-brazing
Fe / Al dissimilar metals
numerical simulation
peak stress
