thank you for your reply but I think that's not exactly what I'm looking for. The user_tbelastic.F does not look like a complete user material rather than definition of the elasticity parameters. My problem is that I did some changes to the usermat.f code to check out how the coding works but ansys does not give me any results when I work with the compiled usermat.f code. That's why I'm asking for an easier example than the BISO material law that is written in the usermat.f example.
Later on I'd like to write a completely new usermat for my project but until then I need to figure out how usermat is actually working. Would be great if somebody has some more advice or tips on how to proceed with the first changes in an usermat code and make sure that everything is working correctly.