Prony coefficients from stress relaxation on pure shear sample

Hello all,

I am currently running a bunch of simulations on carbon black filled rubber components. I am using the curve fitting tool in Abaqus CAE to get the prony coefficients.

I have the stress relaxation test data obtained from a pure shear test. Does anyone know if it is valid to use this data with the *SHEAR TEST DATA option?

Thanks in advance.

-Praveen