关于2维平面应力和应变的金属塑性本构方程显示计算代码vumat(explict compution metal material constitutive model vumat)

一受均匀拉力的板，中心带贯穿裂纹，裂纹长2a，使用4节点单元计算裂尖应力分布和应力强度因子(A uniform tensile plate with a through crack in the center and a crack length of 2a is used to calculate the stress distribution and stress intensity factor at the crack tip using a four node element)

对于一个管道模型的弹性力学模拟，计算形变和应力(For the elastic simulation of a pipe model, calculate the deformation and stress)