David Weed
Ansys Employee

Hello Freerik,

You may consider storing the back stress in a state variable. That way, you are not constrained by what the subroutines may/may not offer.

Alternatively, see the ElemGetMat routine. It has variable storage for back stress: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v222/en/ans_prog/Hlp_P_UPFNEWEL.html

This subroutine is technically for a user-defined element, but it may work for pre-existing elements.