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using comsol multphysics to add structural mechanics

Posted 23 oct. 2012, 19:31 UTC−4 MEMS & Nanotechnology, MEMS & Piezoelectric Devices, Studies & Solvers, Structural Mechanics Version 3.5a 2 Replies

Nishant Patel
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i'd like to add the Stress and strain tensor equations and others into the comsol multiphysics plane strain (this is hopes of including gauss's law -which i can already do- to make the piezoelectric constitutive relations).

however, i'm having issues with the notation. does anyone know how to do this?

2 Replies Last Post 24 oct. 2012, 17:42 UTC−4
Nishant Patel
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Posted: 1 decade ago 24 oct. 2012, 17:41 UTC−4
I got it to work.

=sE(1,1)[1/Pa]*sXm_ps+sE(1,2)[1/Pa]*sYm_ps+sE(1,4)[1/Pa]*sXmYm_ps+0[C/N]*Ex_es+0[C/N]*Ey_es

However, my new issue now is that I can't equate this to eXm_ps (the strain term) since eXm_ps is used somewhere else.

is there any way around this?
I got it to work. =sE(1,1)[1/Pa]*sXm_ps+sE(1,2)[1/Pa]*sYm_ps+sE(1,4)[1/Pa]*sXmYm_ps+0[C/N]*Ex_es+0[C/N]*Ey_es However, my new issue now is that I can't equate this to eXm_ps (the strain term) since eXm_ps is used somewhere else. is there any way around this?
Nishant Patel
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Posted: 1 decade ago 24 oct. 2012, 17:42 UTC−4
I got it to work.

=sE(1,1)[1/Pa]*sXm_ps+sE(1,2)[1/Pa]*sYm_ps+sE(1,4)[1/Pa]*sXmYm_ps+0[C/N]*Ex_es+0[C/N]*Ey_es

However, my new issue now is that I can't equate this to eXm_ps (the strain term) since eXm_ps is used somewhere else.

is there any way around this?

I get the "duplicate variable name"

it says the variable is defined in the boundary.

These constitutive relations are defined in the subdomain.
I got it to work. =sE(1,1)[1/Pa]*sXm_ps+sE(1,2)[1/Pa]*sYm_ps+sE(1,4)[1/Pa]*sXmYm_ps+0[C/N]*Ex_es+0[C/N]*Ey_es However, my new issue now is that I can't equate this to eXm_ps (the strain term) since eXm_ps is used somewhere else. is there any way around this? I get the "duplicate variable name" it says the variable is defined in the boundary. These constitutive relations are defined in the subdomain.

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