You can enter both relaxation curves through the corresponding time curves under the Tables&Curves.
If Temperature effects are to be considered, Glass transition Temperature and the two material constants must be specified.
Hope this helps.
I know I *can* enter both curves but do I *have* to enter both curves? Is one enough?
See my original post and the screenshots. I have entered Tg. Are the two material constants you refer to the C1 and C2 WLF constants which I've also entered?
What puzzles me is how SW knows what temperature the shear relaxation graph is taken at? Does it make an assumption and if so, what is that assumption?
I see you entered already Tg and WLF constants C1 and C2. Bravo!
With respect to the curves, Both shear relaxation data and bulk relaxation data are required for the viscoelastic material model.
The general constitutive equation uses both shear and bulk relaxation functions in the stress formulation
Please take a look at 2018 SOLIDWORKS Help - Viscoelastic Model.