abaqus umat for concrete constitive law

现在用到VUMAT，发现网上这种小例子很少，关于VUMAT的资料也不多。摸索了一天，做个VUMAT的小例子供大家分享。(Now use VUMAT, found that there are few small examples of online, VUMAT on the information is not much. Groping for a day, to be a small example of VUMAT for everyone to share.)

该Fortran程序主要适用用于模拟实体单轴压缩，定义材料的属性。(It is used to simulate the uniaxial compression of the solid body.)

abaqus中umat子程序详解已经例子分析(Example analysis of UMAT subroutine in ABAQUS)