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Empty Elasticity and Coupling matrix

Posted Aug 22, 2018, 3:13 p.m. EDT MEMS & Nanotechnology, MEMS & Piezoelectric Devices, Materials 5 Replies

Dulanjana Perera
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I have noticed that sometimes when Si or Cu is used as a material for piezoelectric or piezoresistive simulations, comsol gives empty Elasticity and Coupling matrix. hence i have to manually input those matrixes in order perform simulation further more. So what is this?

I have attached a screenshot.

5 Replies Last Post Aug 26, 2018, 5:05 a.m. EDT
Dave Greve
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Posted: 6 years ago Aug 22, 2018, 5:35 p.m. EDT

Umm...these are not piezoelectric materials. You need to make them linear elastic materials.

Umm...these are not piezoelectric materials. You need to make them linear elastic materials.
Dulanjana Perera
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Posted: 6 years ago Aug 23, 2018, 3:23 a.m. EDT

Umm...these are not piezoelectric materials. You need to make them linear elastic materials.

I understand that. But how can I make them Linear Elastic material. I am trying to harnest energy using Piezoelectric material. So that I need electrodes to capture that potential.

>Umm...these are not piezoelectric materials. You need to make them linear elastic materials. I understand that. But how can I make them Linear Elastic material. I am trying to harnest energy using Piezoelectric material. So that I need electrodes to capture that potential.
Edgar J. Kaiser Certified Consultant
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Posted: 6 years ago Aug 23, 2018, 7:47 a.m. EDT

Delete the electrodes from the piezoelectric subnode and they will automatically appear in the linear elastic default node.

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Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Delete the electrodes from the piezoelectric subnode and they will automatically appear in the linear elastic default node.
Henrik Sönnerlind COMSOL Employee

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Posted: 6 years ago Aug 23, 2018, 8:15 a.m. EDT

Note that a linear elastic material can still be part of the solution in the Electrostatics interface, it is just that the electric and mechanical fields are uncoupled. So you need to remove those domain also from Charge Conservation, Piezoelectric so that they appear in the selection for the default Charge Conservation node.

Regards,
Henrik

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Henrik Sönnerlind
COMSOL
Note that a linear elastic material can still be part of the solution in the Electrostatics interface, it is just that the electric and mechanical fields are uncoupled. So you need to remove those domain also from Charge Conservation, Piezoelectric so that they appear in the selection for the default Charge Conservation node. Regards, Henrik
Dulanjana Perera
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Posted: 6 years ago Aug 26, 2018, 5:05 a.m. EDT

Thank you all for the information. Really helpfull. Comsol is a stronge analytical tool but, amount of tutorials are very low. Anyway we still use it because of its power and accuracy.

Thank you all for the information. Really helpfull. Comsol is a stronge analytical tool but, amount of tutorials are very low. Anyway we still use it because of its power and accuracy.

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