×
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

Abaqus solver problem (zero pivot)

Abaqus solver problem (zero pivot)

Abaqus solver problem (zero pivot)

(OP)
I modelled typical 3D tunnel construction. The msg file showed "Zero pivot when processing D.O.F. 8 of 49 nodes." which is overconstraint problem, it said "There are multiple constraints applied directly or chained constraints that are applied indirectly at this node. A list of nodes and chained constraints between these nodes that most likely lead to the detected overconstraint can be printed out to the message file by including *constraint controls, print=yes in the input file."

My questions are about when I checked odb file, I found 49 nodes located inside the middle part of the clay ground model, what's the reason? And how to solve this bloody problem?

Actually I have tried many methods like changing boundary conditions and contact (node-to-surface), but still the same problem. Please help me! Many thanks!

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