×
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

convergence issues, elements deforming excessively

convergence issues, elements deforming excessively

convergence issues, elements deforming excessively

(OP)
All, I am running an analysis that includes pore fluid flow. That means that initial stress conditions are effective stresses. If I run the analysis assuming elastic behaviour is fine. If I employ the mohr-coulomb plasticty model behaviour I got convergence issues it said that some element are deforming excessively. This happens in the early stages of the analysis and I checked all boundary conditions and they look fine. Any clue? Do I missing something?
Rgds, Sergini

RE: convergence issues, elements deforming excessively

Units ok ?

RE: convergence issues, elements deforming excessively

Are you applying dead load(s) or prescribed displacement(s)? The former can give rise to such problems as yours in elastic-plastic analyses. If you can, consider applying the latter instead of the former.

Try reducing the magnitude of load in your initial step, and/or try reducing the initial increment size and maximum increment size in the step. With regard to the latter, ABAQUS will increase the size of successive increments if convergence of previous increments is satisfactory. Unfortunately, this sometimes leads to excessive deformation in subsequent increments as the extent of plastic deformation increases in the model: leading to convergence difficulties, increment size cut-backs and so on.

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