之前使用学校的自动升级程序安装的 Abaqus 6.14.3 居然没有自动连接 Fortran 编译器，导致使用用户子程序的时候发生编译错误。试了好半天才找到解决办法，记录备查。
Abaqus 与 Fortran 的连接
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标签： VUMAT
An example of VUMAT using Hashin criteria for composites
Here is an example of VUMAT using Hashin criteria for composites. Rumors said it was from the company. This is re-posted from nabble.com. I have not test it. And I also found the same VUMAT in the appendix of a PhD thesis (please refer to the foot of this post).
Abaqus linking error
Because of carelessness, I ran into a ‘problem during linking’ error in Abaqus. The mistake was misspelling a dimensional variable name. That caused the variable used had not been declared.
2 materials in 1 VUMAT
VUMAT can be implemented to a model which has more than one user custom materials, using cmname variable to identify the materials.
在 vumat 中确定 element 的编号
如何在 VUMAT 中确定处理的 Element 的序号？这是个有趣的问题。在 polymerfem.com 找到一个方法并附有解释。记录，暂无验证。