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Internal stress does not affect mechanical eigenvalues.
Posted Dec 11, 2013, 2:55 p.m. EST MEMS & Nanotechnology, MEMS & Piezoelectric Devices, Structural Mechanics Version 4.3b, Version 4.4 1 Reply
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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
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Hello Jack Sankey
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