Nanda Veralla
Ansys Employee

Hello Ammar,

Can you be more specific what you're trying to do? Do you want to fit 2 curves for a single material?

If you want to use curve fitting using APDL, you can follow the ANSYS help here for hyperelasticity

4.6. Hyperelasticity (

and here for Viscoelasticity

4.7. Viscoelasticity (

Prony series complex modulus is used in ANSYS to represent small-deformation harmonic viscoelasticity. For more details see this Viscoelasticity in the Structural Analysis Guide

Thanks and Regards,