×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Jobs

Stability/Energy Question from ABAQUS output

Stability/Energy Question from ABAQUS output

Stability/Energy Question from ABAQUS output

(OP)
For a structure that I believe to have passed its stability point (based on load-deflection behavior that has passed a point with zero tangential stiffness/went through a maximum) can anyone confirm that at that I should be able to verify the stability point has been reached using energy output from ABAQUS like the following:

Total Potential (TP) = Internal (IE) + External Energy (EE)

The latter two terms I can get from ABAQUS, then by finding the slope of sequential terms using  the difference in displacement in the denominator (so I have something like (TP2-TP1)/(u2-u1)) I get the first variation in the total potential function.  

The first point where this value becomes zero becomes negative should imply neutral/unstable equilibrium?

Thanks!

RE: Stability/Energy Question from ABAQUS output

maybe i'm wrong, but i'd've thought that internal energy (strain energy) = external energy (work done by loads) for a stable model.

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!


Resources