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How to build a viscoelasticity damping model of solid
Posted 2019年10月29日 GMT-4 10:09 Structural & Acoustics, Structural Mechanics Version 5.4 0 Replies
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I am studying the attenuation of ultrasonic wave in viscoelastic solid (using transient study). However, when adding a viscous damping subnode, I don't know how to get the viscosity parameter: bulk viscosity ηb and shear viscosity ηv. And loss factor damping can't be used in transient study.
Although I have found some formulas to calculate the value of ηb and ηv in StructuralMechanicsModuleUsersGuide (p152) :
ηb=Kη/ω
ηv=Gη/ω
K is bulk modulus, G is shear modulus, η is loss factor, ω is excitation frequecy
I can't figure out the meaning of the parameters in the formulas above. What's more, the attenuation coefficient calculated using these formulas in COMSOL was quite different from the experimental result. So I don't know how to proceed with the calculation.
I hope somebody could provide me with some advice. I want to know how to get the parameters of the viscosity or some formulas to calculate the parameters. I also hope to know some other methods or models to simulate the propagation of ultrasonic wave in viscoelastic solid material.
Thanks for your help.
Xiangwei Geng
Hello Xiangwei Geng
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