×
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

Need Help! Steps and time increment?

Need Help! Steps and time increment?

Need Help! Steps and time increment?

(OP)
Hi there,

Not sure if I will get a response here or not but am giving it a shot.  I am working on a simple problem (two steps) and at during the second step get this error:

"The plasticity/creep/connector friction algorithm did not converge at # points"

The # starts off huge and keeps going down with successive increment attempts untill it reaches something like 1.
  
I did a quick search on here and decreased my min increment size to 1E-10.  And evern tried remeshing with no luck.  Any ideas on what else might fix this?  Decrease the min increment further?  

I know this is pretty vague but did not want to bore with a lengthy post.  Im working with version 6.7 can add details/ upload my model if anyone would be willing to help.

Thanks in advance!

RE: Need Help! Steps and time increment?

Looks like "The plasticity/creep/connector friction algorithm did not converge at # points" is your problem but to be sure try removing all of this from your analysis and see if it converges.  Add the extra complexity 1 at a time.  Good luck.

Rob Stupplebeen

RE: Need Help! Steps and time increment?

(OP)
Thanks for the reply.  I am new to the program and am not sure where to look for the problem.  

I have only used the general user interface to create the model with the exception of defining my "geostatic" condition.  My problem has two steps: 1) geostatic 2) Loading.

 

RE: Need Help! Steps and time increment?

I agree with Rob, I would also build the model up. It has helped me in the past adn that way you know where the problem lies.  If you problem hs any contact, maybe simplify this to see if you obtain a coverged solution. Same with materials properties.

RE: Need Help! Steps and time increment?

(OP)
Thanks guys, after tons of digging I think my problem has been resolved!

RE: Need Help! Steps and time increment?

What was the conclusion so others can learn? (including myself)

Rob Stupplebeen

RE: Need Help! Steps and time increment?

(OP)
The problem was with my contact, I don't know excatly what went wrong but I built up my model from scratch and voila! Problem solved :)...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