Bill Bulat
Ansys Employee

I still need to get more details to satisfy your request, but I guess it might be prudent for us to first agree that it is possible to define combined hyperelastic and prony material models in MAPDL (see the two screen shots below): It seems possible to curve fit both viscoelastic and hyperelastic data to obtain the constants used to define material model constants:I see no prior mention of the TBFT command in this thread. Are you aware that this is central to curve fitting in MAPDL? Additionally, I could be wrong about this, but it may be necessary to obtain the constants for two seperate material numbers, then manually rewrite the commands that define the constants in such a way that they define both material models for the same material number.