How to solve an enrichment element problem in UMAT subroutine?

I want to run my UMAT-subroutine with XFEM in ABAQUS, but I get an error such as: "THE PENALTY STIFFNESS HAS TO BE PROVIDED BY USING *SURFACE BEHAVIOR, PRESSURE-OVERCLOSURE=LINEAR OR *SURFACE...

05 May 2017 3,662 2 View