ANAND粘塑性本构模型在热处理消除焊接残余应力效果定量评价中的应用

APPLICATION OF ANAND VISCOPLASTIC CONSTITUTIVE EQUATION IN THE QUANTITATIVE EVALUATION OF THE REDUCTION OF WELDING RESIDUAL STRESSES DURING THE POST-WELD HEAT TREATMENT

将ANAND粘塑性本构关系引入到焊后热处理消除残余应力的有限元计算中。计算结果表明 ,ANAND本构关系可以较好的模拟焊接件在热处理条件下的力学行为 ,采用该本构关系所计算出来的残余应力消除效果明显 ,Y方向的残余应力减小幅度在 30 %以上 ,而且表面的残余应力还由处理前的拉应力变为压应力。此外 ,该本构关系还可以进一步应用到热处理条件的优化中。

ANAND viscoplastic constitutive equation was introduced into the FE model for calculation of the reduction of welding residual stresses during the post weld heat treatment. The results show that ANAND equation could model the mechanical behavior under high temperature conditions. The residual stresses σ y was reduced at least 30% after heat treatment, and the tensile residual stresses on the surface of the specimen turned into compression. Further more, this constitutive equation could be used to the optimization of the heat treatment conditions.