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

Panel Buckling by Enforced Displacement

Panel Buckling by Enforced Displacement

Panel Buckling by Enforced Displacement

HI Folks,

I am running a panel buckling analysis using enforced displacement method in NASTRAN (using SPCDs). It usual practice to consider only the transnational components in the analysis. I am just curious to know why the rotational components need to be / need not be considered.


RE: Panel Buckling by Enforced Displacement

I am assuming that you are leaving the rotational enforced displacements blank (as opposed to entering 0.0) on the SPCD card. From my reading of the quick reference guide I think that this means that the edges are free to rotate and thus you have pinned boundary conditions. This is conservative as real structure (usually) has an intermediate amount of fixity between pinned and fixed that you are not taking advantage of. I would double check this for your critical load case by (1) extracting the actual rotational displacements and looking for the Eigenvalue to increase and (2) putting zero as the rotational displacements and looking for the Eigenvalue to increase again as you are now simulating fixed edge conditions.

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


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. 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