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Elasticity matrix,voigt notation of PDMS

Posted 2013/05/09 2:28 GMT-4 Structural Mechanics Version 4.3a 2 Replies

Abhijit Kakati
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Hi,

I am currently working on bio-compatible material based sensor, where i want to use PDMS (Polydimethylsiloxane) as a membrane.But I can not get Elasticity matrix,voigt notation(mechanical properties) of PDMS for simulation.

Do any of you know the Elasticity matrix,voigt notation of PDMS?
2 Replies Last Post 2013/05/10 3:16 GMT-4
Chris Layman
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Posted: 1 decade ago 2013/05/09 10:02 GMT-4

Hi,

I am currently working on bio-compatible material based sensor, where i want to use PDMS (Polydimethylsiloxane) as a membrane.But I can not get Elasticity matrix,voigt notation(mechanical properties) of PDMS for simulation.

Do any of you know the Elasticity matrix,voigt notation of PDMS?


PDMS can have a large range of properties depending on the monomer to hardener ratio. Also, I am not aware that PDMS would have to be modeled anisotropically, you can try isotropic settings and avoid directly having to input into the C-tensor. For what it is worth, I commonly use these values for bulk PDMS. p-wave speed = 1020 m/s, shear wave speed = 25 m/s and density = 1040 kg/m^3.

Adding in damping is a whole other issue, and important one. Also, depending on how thin your membrane is ... this might not be right, if scale dependent issues arise. Also also, I've only described a linear approximation, PDMS is hyperelastic and often is modeled that way. Modeling these soft elastomers can be tricky. So basically, I can't help very much.

~Chris
[QUOTE] Hi, I am currently working on bio-compatible material based sensor, where i want to use PDMS (Polydimethylsiloxane) as a membrane.But I can not get Elasticity matrix,voigt notation(mechanical properties) of PDMS for simulation. Do any of you know the Elasticity matrix,voigt notation of PDMS? [/QUOTE] PDMS can have a large range of properties depending on the monomer to hardener ratio. Also, I am not aware that PDMS would have to be modeled anisotropically, you can try isotropic settings and avoid directly having to input into the C-tensor. For what it is worth, I commonly use these values for bulk PDMS. p-wave speed = 1020 m/s, shear wave speed = 25 m/s and density = 1040 kg/m^3. Adding in damping is a whole other issue, and important one. Also, depending on how thin your membrane is ... this might not be right, if scale dependent issues arise. Also also, I've only described a linear approximation, PDMS is hyperelastic and often is modeled that way. Modeling these soft elastomers can be tricky. So basically, I can't help very much. ~Chris
Abhijit Kakati
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Posted: 1 decade ago 2013/05/10 3:16 GMT-4
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