Im very new to this forum
Im currently working on a metal-plastic contact analysis between steel and RTFE ((15% glass fibre reinforced Teflon).
I want to find the contact pressure and stresses devoloped in the RTFE seal(washer) to test the leakage problem for a valve
Im using Altair Hyperworks for my analysis.
I had done some linear static analysis with linear elastic material for RTFE.
But im not so confident with my results as the material is nonlinear.
So now im trying to do the analysis with a nonlinear material. But im still struggling to choose material model for RTFE.
I have gone through lot of threads related to my problem in polymerfem.
Then i could find that the best material model for RTFE is DNF model.
But it is custom made and not avalible with hyperworks. DNF posses both viscoelastic and viscoplastic behavior. But for my software i can choose only one type at a time either viscoelastic or viscoplastic.
Im intrested only in contact pressure and stresses, can any body suggest me a good and easy material model
I got following options in hyperworks
1. Hyperelastic - Ogden Model
2. Elasto-plastic - Jhonson cook model with vonmises hardening
3. Elasto-plastic - Gurson model (von mises with viscoplastic flow)
4. Viscoelastic - Generalized Kelvin-Voigt
5. Viscoelastic - Generalized Maxwell-Kelvin
6. Viscoelastic - Boltzman
7. Viscoplastic - Closed cell, elasto-plastic foam
Please suggest one from above or any other material model.
Also help me in finding the parameters for these models(methods, what type of testing required)
Thanks & Regards