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依据焊接过程的特点，本文把焊接构件分成熔池液相区、固液共存区和固相区三个区域。为了建立焊接凝固裂纹驱动力数值模拟模型，本文详细分析了这三个区域的力学行为，在实测了液态金属的凝固速率和固液态金属的加载卸载响应曲线的基础上着重研究了熔池的变形、固液共存区金属的流变性能和凝固收缩对熔池尾部应力、应变演变过程的影响。最后，采用单元死活的方法解决了熔池的变形问题，采用热、弹、塑性力学方法处理了固相区的应力、应变本构关系，从而建立了一种计算凝固裂纹驱动力的有效方法。
According to the characteristics of the welding process, the welding component is divided into three zones: liquid zone, solid-liquid coexistence zone and solid zone. In order to establish the numerical simulation model of welding solidification crack driving force, this paper analyzes the mechanical behavior of these three areas in detail. Based on the measured solidification rate of liquid metal and the loading-unloading response curve of solid-liquid metal, the deformation of molten pool , The solid-liquid coexistence zone metal rheological properties and solidification shrinkage on the tail of the pool stress and strain evolution process. Finally, the deformation and deformation of the weld pool are solved by the method of unit life and death, and the stress and strain constitutive relations of the solid zone are processed by the method of heat, elasticity and plasticity. Thus, an effective method for calculating the driving force of the solidification crack is established.