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Multi-stack piezoelectric device simulation
Posted Jun 3, 2019, 6:32 a.m. EDT Electromagnetics, MEMS & Nanotechnology, Piezoelectric Devices Version 5.4 2 Replies
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Hi,
I have a thin layer of piezoelectric material sandwiched between relatively thin film of two distinct metals. I am experiencing few problems while setting up the simulation.
First, the material properties for metals require coupling matrix even though they are not piezoelectric materials.
Second, comsol prefers stress-charge form parameters. How do I change this setting to strain-charge form so, I won't have to change elasticity to compliance matirx and d-matrix to e-matrix?
And last, how do I know whether the relative permittivity on material datasheet is given at constant stress or constant strain?
Will really appreciate your time while answering any or all of my queries. Thank you in advance!
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First, the material properties for metals require coupling matrix even though they are not piezoelectric materials.
You need to specify that the metals are linear elastic materials under the Solid Mechanics node.
Second, comsol prefers stress-charge form parameters. How do I change this setting to strain-charge form so, I won't have to change elasticity to compliance matirx and d-matrix to e-matrix?
Stress-charge is the default, not a preference. Select strain-charge under the settings for the Piezoelectric Materials node.
And last, how do I know whether the relative permittivity on material datasheet is given at constant stress or constant strain?
If the datasheet doesn't say, you will have to consult the manufacturer.
D.W. Greve
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Thank you, Dave!