Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.
Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
Internal stress does not affect mechanical eigenvalues.
Posted 2013年12月11日 GMT-5 14:55 MEMS & Nanotechnology, MEMS & Piezoelectric Devices, Structural Mechanics Version 4.3b, Version 4.4 1 Reply
Please login with a confirmed email address before reporting spam
I am trying to use "Initial Stress and Strain" in Solid Mechanics to tune the mechanical frequency of a (doubly-clamped) micro-beam.
I am trying to use "Pre-stressed Eigenfrequency Analysis" which lets the beam relax then should use this as the linearization point for calculating the eigenfrequencies.
This technique works okay in 2D but not for a 3D model. No matter what I apply to the "initial stress and strain" tensor, I cannot change the eigenvalues. I do know the stationary solver is working; adding stress does change the displacement in a sensible way.
Is there a solution to this? Is it a bug? Enclosed is what I'm looking at.
Thanks in advance,
Jack
Attachments:
Hello Jack Sankey
Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.
If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.
Please login with a confirmed email address before reporting spam