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Re: Mooney-Rivlin coeffcients for Silicon Rubber
Looks like you may have some equations to work out today. Those constants have a few or more variables to get what your looking for. I would like to see what you come up with.
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Re: Mooney-Rivlin coeffcients for Silicon Rubber
Hi Robert,
yes those constants are related to shear modulus in the form of μ1 and μ2. So I need to know those constants in order to determine μ1 and μ2 right?
Any idea?
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Re: Mooney-Rivlin coeffcients for Silicon Rubber
Shear Modulus and Bulk Modulus. μ1 and μ2 and K1 are material properties. Here is some good links I found.
http://www.continuummechanics.org/cm/mooneyrivlin.html
http://ansys.net/ansys/papers/ANSYS_Users_Group_Hyperelastic_Materials.pdf
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Re: Mooney-Rivlin coeffcients for Silicon Rubber
Hi Robert,
thanks. I decided to model the material with a neo-Hookean model but I can't find it in solidworks library. Do you know if it exists?
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Re: Mooney-Rivlin coeffcients for Silicon Rubber
Hi Jared,
I know the shear modulus and the bulk modulus. If I use the neo-Hookean model I can calculate the constants needed, but for the case of Mooney-Rivlin it's not that straightforward because I need to know some experimental data that I don't have. So I wan't to use Neo-Hookean model but I can't find the definition in SOLIDWORKS.
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Re: Mooney-Rivlin coeffcients for Silicon Rubber
the material models are what they are and are documented in the help. if you can't find it, it likely doesn't exist in the software and would be an enhancement request. that being said, if you describe the material model you're trying to use, someone may be able to help you pick an alternative
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Re: Mooney-Rivlin coeffcients for Silicon Rubber
Mina,
If you want accurate outputs from your analysis, you will need accurate input for the hyperelastic model. The way to get that is through testing of representative samples of the material. There are labs that specialize in this, but it costs roughly $1000 per material. (That was a number of years ago, so probably higher now.)
If you want something quick and dirty, I've attached an Excel spreadsheet with values that I got off of the web some time ago. I have no idea what the provenance is and would not trust the numbers for anything at all important.
Jerry S.