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基于Von Mises屈服准则和线性等向性硬化准则,采用相关的弹塑性本构方程建立了TIG焊接不锈钢316L动态模型,研究了不同焊接热源模型对焊接过程中温度和残余应力分布的影响规律。结果表明,双椭球模型中的等温线更倾向于长条形,沿焊缝方向温度梯度较小;3D锥形高斯热源的等温线相对更圆,沿焊缝方向温度梯度更大;两种热源模型对横向残余应力和纵向残余应力的分布规律影响不大。
Based on Von Mises yield criterion and linear isotropic hardening criterion, a dynamic model of 316L stainless steel for TIG welding was established by using the relevant elastoplastic constitutive equations. The influence of different welding heat source models on the distribution of temperature and residual stress during welding was studied. The results show that the isothermal lines in the double ellipsoid model are more inclined to the strip shape, and the temperature gradient along the weld direction is smaller. The isothermal curves of the 3D pyramidal Gaussian heat source are relatively more circular, and the temperature gradient along the weld direction is larger. The heat source model has little effect on the distribution of lateral residual stress and longitudinal residual stress.