MEMS and Duffing curve on ANSYS APDL

AI Thread Summary
The discussion centers on modeling a clamped silicon beam in ANSYS using SOLID45 and TRANS126 elements, focusing on achieving a Duffing curve that exhibits hardening or softening behavior. The user is conducting a Transient NonLinear analysis but is only observing a linear response, which may be influenced by the inclusion of Rayleigh Beta Damping. They seek assistance in troubleshooting this issue to properly represent the desired nonlinear characteristics of the system. The user also suggests that the topic might be better suited for the Mechanical Engineering forum. Overall, the inquiry highlights challenges in simulating nonlinear dynamics in MEMS applications.
Torseur06
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Hi all,

I'm a student in an Engineer School in France and I would like to know if you can help me on this subject.

The system, I have to model on ANSYS, is composed by a clamped clamped silicon beam and actuated by an electric signal V=Vc+Va*cos(w*t) from an electrode located under the beam.

I succeeded to model the beam by SOLID45 elements, and the gap between the beam and the electrode by TRANS126 elements thanks to the EMTGEN macro.

I'm in a Transient NonLinear analysis and I would like to make appear an hardening or softening regime.
For information the 'ylabel' of the Duffing curve is the maximum amplitude and the 'xlabel' is the pulsation 'w'. We draw this curve around the 1st circular pulsation of the beam. The tension Vc and Va are fixed.

However when I run my 'batch' I get a linear regime without softening or hardening regime.
I wonder if it's not the fault of the damping I include. Indeed, I include a Bdamp (Rayleigh Beta Damping).

Can you help me please ?

Thank you very much...
 
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Anybody can help me please ...?
 
Perhaps a mod could move this to the Mechanical Engineering forum.
 
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