低温环境下栓钉环焊缝焊接残余应力场数值模拟

Numerical simulation of residual stress field of stud girth weld in low temperature environment

为了研究低温环境对栓钉焊接残余应力分布规律的影响,通过ABAQUS建立栓钉模型进行数值模拟,考虑了5个不同的温度进行有限元热-固耦合分析。结果表明:Mises应力、径向残余应力最大值均位于焊缝附近10 mm处,随着距离的增加迅速衰减;环向残余应力在焊缝附近为残余拉应力,远离焊缝处为残余压应力,最大值位于焊缝中心;低温会提高焊接残余应力,Mises应力集中表现在焊缝中心,环向残余应力集中表现在焊缝附近,径向残余应力在焊缝中心及焊缝附近均有所增加。低温对提高焊接残余拉应力影响明显,对残余压应力影响不大。

In order to study the influence of low temperature environment on the distribution law of welding residual stress,a stud model through ABAQUS for numerical simulation was established,and 5 different temperatures for finite element thermal-solid coupling analysis were considered.The results show that the maximum values of mises stress and radial residual stress are both located at 10 mm near the weld,and decay rapidly with the increase of distance;the hoop residual stress is residual tensile stress near the weld,and is compressive stress away from the weld,and the maximum value is located in the center of the weld;low temperature will increase the residual stress of the weld,the mises stress is concentrated in the center of the weld,the hoop residual stress is concentrated near the weld,and the radial residual stress increases both in the center of the weld and near the weld.The low temperature has a significant effect on increasing the residual tensile stress of welding,but has little effect on the residual compressive stress.