Region used for material orientation assignment can also be used in meshing a part. Here is an example of messing a part using C3D8R element.
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Python for Abaqus: code for discrete material orientation assignment
Some Python codes for build Region in Abaqus are really difficult to figure out although Abaqus has a lot of examples and detailed manual and reference. Here is an example for creating discrete material orientation using Python script.
A yarn level simulation on fabric under ballistic impact using Abaqus
To help my colleague to catch up on the finite element simulation of ballistic impact on a fabric based on a yarn level model in Abaqus, I recorded this whole procedure for sharing.
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).