Hi all, I am responsible for porting Prof. Clausen UMAT for MC model in Calculix. Not a big merit, but the UMAT works for some classical problems. I tested it in bearing capacity problems but had not enough time to make a well organized report with the validation. The subroutine was compiled along with a 2.8 CCX release both under Ubuntu 16 and Win/Cygwin. As any UMAT it requires a recompilation of the program, so using MFRONT should be easier.