Oops. Turns out I'm still not used to Fortran's indexing and referred to what should have been the first item in PROPS (e.g. PROPS(1)) as PROPS(0). D'oh.
Hello,
I am in the process of learning how to implement a UMAT for my abaqus models.
I am starting small - using a single element and implementing isotropic linear-elasiticity theory so I can easily confirm my answers. I have implemented this behavior successfully on a single C3D8 brick...