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How to restrain only the electrical displacement in the y direction in a piezoelectric module

Posted Jan 17, 2020, 3:31 a.m. EST Piezoelectric Devices, Structural & Acoustics, Equation-Based Modeling Version 5.4 3 Replies

XV Lou
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dear！ I am doing a subject of piezoelectric beams subjected to lateral forces,and i want to constrain electrical displacement only in y direction,but in comsol i find i need to constrain both x and y direction,like the graphic in annex，can you tell me how to solve it?

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3 Replies Last Post Jan 20, 2020, 2:09 a.m. EST
Dave Greve
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Posted: 5 years ago Jan 17, 2020, 10:47 a.m. EST
Updated: 5 years ago Jan 17, 2020, 10:49 a.m. EST

Do you mean mechanical displacement?

Do you mean *mechanical* displacement?
XV Lou
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Posted: 5 years ago Jan 20, 2020, 1:26 a.m. EST

Do you mean mechanical displacement?

no,i mean 'electric displacement' in the piezoelectric module,and it's symbol is expressed as Dx

>Do you mean *mechanical* displacement? no,i mean 'electric displacement' in the piezoelectric module,and it's symbol is expressed as Dx
Henrik Sönnerlind COMSOL Employee

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Posted: 5 years ago Jan 20, 2020, 2:09 a.m. EST

Hi,

This boundary condition is not a 'constraint'. Mathematically, it is a Neumann condition ('flux condition'). Thus, the value zero is the same as not prescribing it at all.

Regards,
Henrik

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Henrik Sönnerlind
COMSOL
Hi, This boundary condition is not a 'constraint'. Mathematically, it is a Neumann condition ('flux condition'). Thus, the value zero is the same as not prescribing it at all. Regards, Henrik

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