Modeling Viton

[JFpoly?]

Dr. Jorgen,

I am modeling a Viton "rod" seal that may experience 2000psi. Will this type of pressure require a hyperelastic model. If so, i have read that the A-B model is best for Viton. Is this true? Is there any chance that you have the constants needed for this model?

If not, and I used that data that you provided (thank you very much by the way), would I use the N-H model?

Thanks for your help!

[Jorgen]

2000 psi = 13.8 MPa (for all you SI-unit people)

That is a significant load, that can cause large deformations. I would recommend that you use a hyperelastic material model, or the Bergstrom-Boyce material model if you are interested in viscoelastic effects.

The Arruda-Boyce Eight-Chain (AB) model would be a suitable starting point in this case.
Most FE software have the capability to calibrate a hyperelastic material model from experimental data.

-Jorgen

[JFpoly?]

Dr. Jorgen,

So I took that data that you provided for Viton (thank you very much!!!) and I am letting abaqus evaluate it. When I do that, the best fit strain energy potentials are the Ogden (N=3) and the Polynomial (N=2). I force it to evaluate for AB model but the curve fit does not look as good. Would I be on the right track using the Ogden (N=3) model with that data?

Thanks!