×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Engine-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!

*Engine-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

Exact Displacements in an Eigenvalue Problem!

Exact Displacements in an Eigenvalue Problem!

Exact Displacements in an Eigenvalue Problem!

(OP)
Hello
I've performed a linear (eigenvalue) and non-linear buckling problem, and everything went perfect except for a question I couldn't find its answer to. The question was that when you applied a fraction of eigenvalues to your nonlinear buckling analysis, do you know exactly the magnitude of the displacements you applied as the geometry imperfections? To answer the following question, I performed a simple problem (rectangular plate modeled by shell elements) and found its first five eigenvalues. The displacements are somehow scaled. I'm assuming if I multiply the scale factor to the magnitude of the displacements I'd get the exact values of those displacements, and I'd be able to answer the question I was asked! Do you agree with that statement? If anyone can guide me on this issue I'll appreciate it!

RE: Exact Displacements in an Eigenvalue Problem!

Unfortunately, you can’t get real displacements from linear buckling analysis by just multiplying them by a factor. Displacements in this type of analysis are normalized so that the maximum is 1. To get actualt magnitudes of deformation you have to perform nonlinear buckling analysis (with or without imperfections in form of scaled mode shapes from preceding linear buckling study).

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 Engine-Tips Forums free from inappropriate posts.
The Engine-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Engine-Tips forums is a member-only feature.

Click Here to join Engine-Tips and talk with other members! Already a Member? Login


Resources

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 Engine-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 Engine-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close