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).
Surface-based cohesive behavior 用于模拟 bonded interface。 但是它不用用于 Surface to Surface Interaction. 否则会遇到错误提示，”Surface based COHESIVE BEHAVIOR cannot be used for contact pair interactions. See the surface iteraction named INTPROP-1.”
这是 Abaqus 提供的一个在线课堂，Composites Modeling – Analysis Procedures and Techniques，综述了复合材料建模的过程和方法。对于获得初步的整体认识还是很有帮助的。