×
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

Problems with non-linear analysis in Ansys 15 Mechanical APDL

Problems with non-linear analysis in Ansys 15 Mechanical APDL

Problems with non-linear analysis in Ansys 15 Mechanical APDL

(OP)
Hey, my problem occurs when trying to perform non-linear structural analysis for Shell 181 model in new Ansys 15. The thing is that the same analysis goes correctly for previous Ansys version (e.g. Ansys 12). However, Ansys 15 doesn't obtain convergence and the solution is made approximately only halfway.
I use typical solver options:
ANTYPE,0
NLGEOM,1
NSUBST,100,105,100
OUTRES,ERASE
OUTRES,ALL,ALL
solve

I am trying to use different solver such as Sparse,PCG,JCG however it still doesn't work. Have you ever met with such a problem, do you know what can be the reason? Probably some solver default options changed in Ansys 15 and I do know which of them. If you have any idea please share.

RE: Problems with non-linear analysis in Ansys 15 Mechanical APDL

This question is close to impossible to answer with the information you've provided. What is the physics behind your model? Strain-rate-dependency, self-contact, frictional contact, non-linear buckling? What material models are you using?

/petb

RE: Problems with non-linear analysis in Ansys 15 Mechanical APDL

(OP)
Model is in fact a Z-profile which consists of 7 layers combining aluminum with composite prepreg. Concerning boundary conditions, the geometry is simply supported and one edge of profile is subjected to uniform pressure causing compressive stress state. I already performed linear eigen-buckling analysis which works perfectly however problems occurs with non-linear buckling.

RE: Problems with non-linear analysis in Ansys 15 Mechanical APDL

(OP)
Performing Timhist Postpro analysis and trying to see one of the nodes displacement the results shows only one value of displacement (I am using option- save every substep in soln control). Nevertheless, I cannot draw any graph.

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