Material property error using XFEM

[regler]

Hi,
I'm using Abaqus (6-11/6-12), trying to simulate crack initiation and growth on
a high temperature application with XFEM. For that reason, I want to combine a
UMAT and a UDMGINI subroutine. The UMAT alone runs fine, but as soon as my input
file contains:

*damageinitiation, criterion=USER, failuremechanisms=1
**data line**
*damageevolution, type=ENERGY
**data line**

-> the following .dat error message occurs:

***ERROR: A MATERIAL PROPERTY HAS BEEN DEFINED MORE THAN ONCE FOR THIS MATERIAL
***NOTE: DUE TO AN INPUT ERROR THE ANALYSIS PRE-PROCESSOR HAS BEEN UNABLE TO
INTERPRET SOME DATA. SUBSEQUENT ERRORS MAY BE CAUSED BY THIS OMISSION


This error occurs, no matter if I use an UMAT (*USER MATERIAL) or just a
standard steel with:
*material, Name=xxx
*elastic
**data line**
*plastic
**data line**

The only way to prevent the error, is to us a standard damage initiation
criterion like:

*damageinitiation, criterion=MAXPS



To me, it doesn't seem like there are much more things to vary in my input-file,
as the .dat file shows this error even with the least possible material
informations.

Many thanks in advance for your help and kind regards,

regler

 

[regler]

Alright, so I fixed the error by adding , FAILURE INDEX=1 to *DAMAGE EVOLUTION.
That is leading to another error in the .dat-file:

*elementoutput, elset=ASSEMBLY_ALL_EL, directions=YES
*elementoutput, elset=ASSEMBLY_ALL_EL, directions=YES
*elementoutput, elset=ASSEMBLY_ALL_EL, directions=YES
***ERROR: THE PENALTY STIFFNESS HAS TO BE PROVIDED BY USING *SURFACE
BEHAVIOR,PRESSURE-OVERCLOSURE=LINEAR OR *SURFACE BEHAVIOR,AUGMENTED
LAGRANGE WHEN USER MATERIAL IS USED FOR A CRACK PROPAGATION ANALYSIS
WITH XFEM

although my inputfile contains:

*Surface Interaction, name=INTERACTION
1.,
*SURFACE BEHAVIOR, PRESSURE-OVERCLOSURE=LINEAR
1.,

I'd greatly appreciate any advice
Thank you