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

Self-contact in a Plate with a Hole

Self-contact in a Plate with a Hole

Self-contact in a Plate with a Hole


I am modelling a plate with a hole in it, subjected to a compressive displacement load. There is an overlap of elements when the hole is compressed and I tried imposing a self-contact to the whole plate but the overlap still occurs. My model is a 3D part with shell elements. I tried reducing the model to 2D and used solid elements which seem to reduce the overlap to some extent. I have a few questions here and would be really great if someone could help me
  1. Is reducing the model to 2D is the only way to avoid this overlap? Is this a right approach?
  2. Am I applying self-contact correctly or am I missing something?
  3. Why can't 3D shell edges be used to apply self-contact?
I also found a similar thread in this forum but there the issue was non-convergence. In my case I am getting solutions for different load cases but I am stuck with the overlap.

Thanks in advance!


Fig.1 Base Model with BC. The model is ZSYMM

Fig.2 3D model with overlap of elements in the top region of the hole

Fig.3 2D model with solid elements with much less overlap

RE: Self-contact in a Plate with a Hole

Most likely self-contact is detected here but there are some penetrations (probably due to coarse mesh). Also, it's best to use general contact, it can account for pretty much all possible contact scenarios, of course including self-contact.

RE: Self-contact in a Plate with a Hole

I tried with a finer mesh with general contact but still the overlap occurs. I also tried moving the hole closer to the load and the overlap is more prominent. Is this overlap unavoidable?

RE: Self-contact in a Plate with a Hole

Is it still 2D (plane stress) ? Make sure that thickness is properly accounted for by contact. You could also try scaling the penalty stiffness.

RE: Self-contact in a Plate with a Hole

No, it is still in 3D only. I have included the shell thickness in the contact. I tried both Penalty and Augmented Lagrange with scaling but no change in the penetration. Does it have anything to do with the shell element in this case? I have uploaded my model. Could you please check and let me know where am I going wrong?

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


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