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

contact penetrating the shell rigid body surface

contact penetrating the shell rigid body surface

contact penetrating the shell rigid body surface


I am running abaqus/explicit, with deformable body confined within a rigid surface formed by shell elements.  After running and viewed from CAE, I can see that the deformable material goes outside the shell surface during the dynamic event.  But how could this happen?  Initially the deformable body was entirely within the shell surface, shouldn't Abaqus contact formulation force the deformable body be on one side of the rigid surface all the time?  If this is not something strange in abaqus, would this affect any modeling accuracy?  Thanks very much!


RE: contact penetrating the shell rigid body surface

Check the normals on your surfaces and make sure that there is no initial overclosure of the surfaces.


RE: contact penetrating the shell rigid body surface

That's an important point, but -- Since in the initial configuration, the deformable body and the rigid body are very close to each other, when meshing, there was inevitably some amount of initial overclosure, which was subsequently adjusted by abaqus pre-processor.  However, even so, there's still some unresolved initial overclosure stored as offsets.  Do you think this is the problem?  Can I replace the shell elements into solid elements (of course, need to replace the surface into a solid in geometry as well), to avoid this problem?  Much appreciated!


RE: contact penetrating the shell rigid body surface

If you have some initial overclosure then one has passed through another before the job has started.
You may find it easier to use analytical rigid surfaces than using rigid shell surfaces, if it's possible. I believe there is some smoothing of the rigid shell surfaces but they look facetted to me and look as if they could cause problems when contacting another facetted deformable element.  


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


eBook - Functional Prototyping Using Metal 3D Printing
Functional prototypes are a key step in product development – they give engineers a chance to test new ideas and designs while also revealing how the product will stand up to real-world use. And when it comes to functional prototypes, 3D printing is rewriting the rules of what’s possible. 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