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对不锈钢凝固裂纹的驱动力即熔池尾部应变场进行了模拟。首先 ,通过单元再生方案 ,消除了焊接构件中熔池变形对熔池尾部应力应变场的影响。其次 ,通过加大材料的线膨胀系数 ,考虑了凝固收缩对熔池尾部应力应变场的影响 ,最终得到了各种条件下的焊接应力 -应变场。此外 ,本文将机械应变随时间变化的关系曲线处理成机械应变随温度变化的关系曲线 ,从而获得了凝固裂纹驱动力 ,为凝固裂纹的预测奠定了基础。
The driving force of the solidification crack of stainless steel, that is the tail strain field of the molten pool, was simulated. First of all, through the unit regeneration scheme, the influence of weld pool deformation on the stress-strain field in the tail of the weld pool is eliminated. Secondly, the influence of the solidification shrinkage on the stress and strain field of the tail of the molten pool was considered by increasing the linear expansion coefficient of the material, and finally the welding stress-strain field under various conditions was obtained. In addition, this paper treats the relationship curve of mechanical strain with time as the relationship curve of mechanical strain with temperature, and obtains the driving force of solidification crack, which lays the foundation for the prediction of solidification crack.