Im simulating stress relaxation of a PTFE lip seal using Abaqus. I have developed the model. But im having trouble with the material properties. I used the experimental data for PTFE provided by Dr. Jorgen. But every time i use the data with hyperelstic model (Mooney-Rvillin) the data file tells me that hyperelastic material is unstable.
I have a couple of questions.....\
1) Is that a specific data set that i should be using and which one should it be??
2) What are the material constants C10 and C01 for PTFE to be used with M-R model ?
Thanks in advance.