Base change in an USER Subroutine

[FrHT]

Hi,

I am currently developping a model in which i need to add a subroutine able to change the base of an element when he reaches a limit stress. I am already using a UMAT so i would like to add this new subroutine to the actual. Do you have any idea how I could do that? I know that the Subroutine ORIENT exists bt it is only to define the orientation of certain elements at the beginning of the calcul while I would like to define the orientation of elements during the calcul.

Thanks for your help

FrHT