文档介绍： VUMAT
 VUMAT
User subroutine to define material behavior.
定义材料本构用户子程序
Product: ABAQUS/Explicit  
Warning:  The use of this user subroutine generally requires considerable expertise. You are cautioned that the implementation of any realistic constitutive model requires extensive development and testing. Initial testing on a single-element model with prescribed traction loading is strongly mended.
注意:用户子程序的使用通常需要一定的专长。用户需要知道执行任何实际的本构模型需要大量的试验数据。强烈建议用户对用户子程序进行在指定拉力作用下单个单元的验证测试。
ponent ordering of the symmetric and nonsymmetric tensors for the three-dimensional case using C3D8R elements is different from the ordering specified in “Three-dimensional solid element library,” Section , and the ordering used in ABAQUS/Standard.
C3D8R单元三维轴对称及非轴对称张量成分顺序与“Three-dimensional solid element library,” Section 。
References
“User-defined mechanical material behavior,” Section
*USER MATERIAL
Overview
User subroutine VUMAT:
用户子程序VUMAT
is used to define the mechanical constitutive behavior of a material;
用来定义材料的力学本构关系
will be called for blocks of material calculation points for which the material is defined in a user subroutine (“Material data definition,” Section );
可以被用户子程序定义材料计算点调用
can use and update solution-dependent state variables;
可以使用和更新结果依赖状态变量
can use any field variables that are passed in;
可以使用传入的任何场变量
is described further in “User-defined mechanical material behavior,” Section ; and
在“User-defined mechanical material behavior,” Section ;
cannot be used in an adiabatic analysis.
可以被用于绝热分析
Component ordering in tensors 张量组成顺序
ponent ordering depends upon whether the tensor is symmetric or nonsymmetric.
张量组成顺序取决于其是否为对称或非对称张量。
Symmetric tensors 对称张量
For symmetric tensors such as the stress and strain tensors, there are ndir+ponents, and ponent order is given as a natural permutation of the indices of the tensor. The ponents are first and then the ponents, beginning with