×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Material property error using XFEM

Material property error using XFEM

Material property error using XFEM

(OP)
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

RE: Material property error using XFEM

(OP)
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

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources