MEMS and Duffing curve on ANSYS APDL

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SUMMARY

The discussion centers on modeling a clamped-clamped silicon beam using ANSYS APDL, specifically with SOLID45 and TRANS126 elements. The user aims to observe hardening or softening behavior in a Transient NonLinear analysis while generating a Duffing curve, which plots maximum amplitude against pulsation. The current analysis yields a linear regime, potentially due to the inclusion of Rayleigh Beta Damping. The user seeks assistance in achieving the desired nonlinear response.

PREREQUISITES
  • Familiarity with ANSYS APDL software
  • Understanding of SOLID45 and TRANS126 element types
  • Knowledge of nonlinear dynamics and Duffing behavior
  • Experience with Rayleigh Damping in transient analysis
NEXT STEPS
  • Investigate the effects of varying Rayleigh Beta Damping on nonlinear responses
  • Learn about advanced modeling techniques for nonlinear systems in ANSYS
  • Explore the implementation of EMTGEN macro for gap modeling
  • Research methods to visualize and interpret Duffing curves in simulations
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Students in engineering, mechanical engineers, and researchers focused on nonlinear dynamics and finite element analysis using ANSYS APDL.

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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