Dear Michael,
Congratulations, there is a good representation of the elasto visco plastic of PP polymer behaviour. I am working too about this class of materials. I think that some corrections must be given on the "NaN" (non analitic) values of s (J an Be) when you use the parameters values like H0=2.2 10^5 (see also Tervoort and Timmermans thesis). I send you more informations later.
