abaqus 二次开发参考资料，包括各种材料子程序UVMAT，加载子程序VDLOAD-abaqus secondary development of reference materials, including a variety of material subroutine UVMAT, load subroutine VDLOAD

ABAQUS软件用户材料子程序-VUMAT,对ZWT模型进行二次开发，采用Fortran语言编程。-abaqus software user subroutine UMAT, ZWT constitutive model for secondary development.