Hello.
I have tensile relaxation test data (stress vs. time for various fixed displacement cases) and would like to use Abaqus to determine the viscoelastic properties (Prony series parameters). However, using *VISCOELASTIC, TIME=RELAXATION TEST DATA requires use of either *SHEAR TEST DATA, *VOLUMETRIC TEST DATA, and/or *COMBINED TEST DATA. Can I somehow use the tensile test data I have to determine the shear test data required? Is it as simple as assuming that the normalized relaxation modulus g_R(t) is equivalent to the normalized relaxation modulus e_R(t)=stress (0)/stress(t)?
Thanks,
Steve