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How to model a silicone rubber?
Posted 4 ago 2021, 11:16 GMT-4 Structural & Acoustics, General, Structural Mechanics Version 5.5 1 Reply
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Today is my first day using COMSOL and I want to do static analysis with a Silicone rubber. Static analysis for rigid objects are quite straight forward and I can find some video lectures on it. However, I cannot quite understand how to do that for Silicone rubber as I do not understand how to model a Silicone rubber in the first place.
As far as I can understand, I have to model them using hyper elastic material models but I am not sure which one to choose and value of the parameters in the model.
From the Silicone rubber data sheet this is what I have. Hardness Shore A - 28 Tensile strength - 6.5 N/mm² Elongation at break - 700 % Linear shrinkage - < 0.1 % Tear strength - > 30 N/mm
I am wondering if hyper elastic model is the only way to go or are there some other simpler methodologies. It would be great if someone could point me the way to proceed.
Thanks in advance, Cheers!
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For materials with a Poisson ratio near 0.5 (like rubber) select Linear Elastic Material > Use mixed formulation > Pressure formulation.
You will have to research whether your particular material needs to be modeled as hyperelastic. And what material parameters need to be entered in Comsol.