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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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Electrostatic actuation problem: Do not get any deformation after coupling force into Solid Mechanics module.

Posted 21.03.2012, 17:26 GMT-4 Low-Frequency Electromagnetics, MEMS & Nanotechnology, MEMS & Piezoelectric Devices, Structural Mechanics Version 4.2 2 Replies

Supannee Leark
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I'm trying to model a deformation of the membrane when subject to electrostatic for by using Solid Mechanics, Electrostatic, and Moving mesh. However, I'm running into 2 problems.

1. I get a warning about inverted mesh. I'm not sure how solve it.
2. I've coupled force from electrostatic module into Solid Mechanics, but I haven't got any deformation/stress output from this module. I've verified that the force output from electrostatic is not zero but I don't know why when I try to couple it into Solid Mechanics, I get zero result.

Note: I disable the ale module because the file is too large to attach.

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2 Replies Last Post 10.04.2012, 02:00 GMT-4
Britt Newell
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Posted: 1 decade ago 06.04.2012, 10:32 GMT-4
Did you manage to find a solution to this problem? I am having the same issue. In 3.5a this method of conversion from electrostatics to structural mechanics works fine. My thought was there is a problem with the variable name es.Forcex_Fes etc.

Thanks,

Britt
Did you manage to find a solution to this problem? I am having the same issue. In 3.5a this method of conversion from electrostatics to structural mechanics works fine. My thought was there is a problem with the variable name es.Forcex_Fes etc. Thanks, Britt
Ralf Tschiesche
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Posted: 1 decade ago 10.04.2012, 02:00 GMT-4
Hi,

the coupling can be made directly via force per unit, then you have the variable for your force available.
But I think, there is a unit problem, because the program calculates a displacement of several 1000m.
Check everything in basic units.

Ralf
Hi, the coupling can be made directly via force per unit, then you have the variable for your force available. But I think, there is a unit problem, because the program calculates a displacement of several 1000m. Check everything in basic units. Ralf

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