usermat.F in HIP process
I am working on HIP ( hot isostatic pressing) by using usermat subroutine.
young modulus poisson ratio , yield stress is a function of relative density and density as a function of plastic strain. so density change by each time step so the others material properties, too
I use usermat code but the problem is the usermat works with constant material properties but whenever i change them as a function of density the code did not work. Can anyone tell me what is the problem?