Menu

Discussion Forum

New Discussion
Filter

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 The information provided may be out of date.

Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

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

Posted Mar 21, 2012, 5:26 p.m. EDT Low-Frequency Electromagnetics, MEMS & Nanotechnology, MEMS & Piezoelectric Devices, Structural Mechanics Version 4.2 2 Replies

Supannee Leark
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

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.

Attachments:

2 Replies Last Post Apr 10, 2012, 2:00 a.m. EDT
Britt Newell
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago Apr 6, 2012, 10:32 a.m. EDT
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
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago Apr 10, 2012, 2:00 a.m. EDT
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

Attachments:

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

Suggested Content