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

NASTRAN Surface-to-Surface Gluing (AKA Glue Elements)

NASTRAN Surface-to-Surface Gluing (AKA Glue Elements)

NASTRAN Surface-to-Surface Gluing (AKA Glue Elements)

Anybody have experience with NASTRAN's glue element approach of connecting surfaces with dissimilar meshes?  They seem to be working out well in static stress models, but for dynamic models, I am having a lot of trouble getting 6 rigid body modes.  I am working with shell elements, and some of my frequencies that should be zero are on the order of 0.1.  Sanity checks show that even if the surfaces are right on top of each other and nodes are coincident, this still happens.  All I've been able to do to produce thee sought near-zero rigid body frequencies is drop the penalty factor to a point at which the glue effect is not accurately captured in the non-rigid body modes.  Any advice?  

Literature states that the internally generated glue elements are essentially very stiff springs, but does not explain further.

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


White Paper - PLM and ERP: Their Respective Roles in Modern Manufacturing
Leading manufacturers are aligning their people, processes, and tools from initial product ideation through to field service. They do so by providing access to product and enterprise data in the context of each person’s domain expertise. However, it can be complicated and costly to unite engineering with the factory and supply chain. 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