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No electrostatics force in the assembly geometry mode?
Posted Apr 13, 2014, 10:07 p.m. EDT Low-Frequency Electromagnetics, MEMS & Nanotechnology, MEMS & Piezoelectric Devices, Geometry, Mesh, Structural Mechanics Version 4.3, Version 4.3a, Version 4.3b, Version 4.4 0 Replies
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I use COMSOL to model a MEMS capacitor, whose top plate will deflect to the bottom plate due to the electromechanics force. The model works well in union mode with the physics of ES+SOLID+ALE. Then I use the contact analysis method to the model because I will investigate the behavior after the plate pull-in. I use the assembly geometry with segregated solvers. Unfortunately, there are several problems that I could not overcome. The top plate does not deflect. I checked the model and found some problems.
1. In the assembly mode, there is no electrostatic force caused by the applied voltage. So the top plate will not deflect to the bottom plate.
2. In the assembly mode, the Prescribed Mesh Displacement could not be set to u or w. I may set the prescribed mesh displacement to zero to avoid errors, but the electrostatic force is equal to zero all the time.
These problems have confused me for several weeks. Any suggestion is appreciated!
The union and assembly models are attached.
Best Regards,
Hello Yu Y.Y
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