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


Model union between two different meshes (Patran)

Model union between two different meshes (Patran)

Model union between two different meshes (Patran)

Hi, following the problem that I tried to describe in the attached picture:
I have a complex model in which I have two structures: a primary and a secondary structure.
The primary structure deforms, and the secondary structure will follow that deformation because it is attached to the primary structure in several parts.
Mergin both models would be too time consuming and we want to keep different levels of mesh refinement on each structure.

What is the best way to tell Patran to make the secondary structure have the same displacement than the primary structure in the connecting parts? Take into account that nodes are not necessarily coincident and that one mesh is finer than the other.

Is it possible to do this using CBUSH or RBE2 elements for example?

Thank you,


RE: Model union between two different meshes (Patran)

Rigid Body Elements are certainly one way to go. Just remember that 3D solid elements do not have rotational capability which 2D Quads have. This incompatibility can be bridged by RBE2 elements.

Similar options can be tried with CBUSH as well theoretically by adjusting translational & rotational spring stiffness. I would suggest doing very simple tests for which you have well defined analytical solutions available. For ex: A simple tension and torsion tests.

Another option could be to use Glue Contact. I am not sure how much gap is here between the 2 surfaces but I think there should be an option to specify gap distance in contact formulation to overcome non-contacting surfaces.

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!


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