Contact US

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!

*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

Zero pivot when processing D.O.F.

Zero pivot when processing D.O.F.

Zero pivot when processing D.O.F.


I'm doing a standard contact simulation divided in two steps, beetween a  3D discret rigid surface and a deformable hyperelastic 3D model. The first step corresponds to the approach and in the second step I Input a vertical force and no boundary conditions for the discrete surface. The analysis is running with no errors but abaqus gives the following warning "Solver problem. Zero pivot when processing D.O.F.  2 of 1 nodes". I read in the Abaqus manual that this kind of warnings may happen when the two surfaces meet for the start of the contact. Can anyone give me a help in this subject

Many thanks!

RE: Zero pivot when processing D.O.F.

If you've made contact in the first step with fixed displacements then you should get no zero pivots then. In the 2nd step remove those redundant restraints and apply your load. If you've only one load in one direction then the other freedoms must be restrained or else you'll get rigid body motion.


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! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close