Abaqus 官方给出的《Abaqus Example Problems Guide》中，第2部分 Dynamic Stress/Displacement Analyses 中示例 18 是关于陶瓷材料的高速冲击问题 High-velocity impact of a ceramic target。模拟陶瓷材料的一个常用本构模型是 JH-2（Johnson-Holmquist model）。示例中使用的 SiC 材料参数在 6.13 及以前版本和 6.14 及以后版本中发生了一些细微的变化。
继续阅读全文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。
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).
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.
VUMAT can be implemented to a model which has more than one user custom materials, using cmname variable to identify the materials.
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。