viscoelastic material model

Hi,

I want to make sure if I am putting the viscoelastic materialproperties in the right way.

I have a table showing me the change in Young moduli due to time (Ican easily conver it to G and K vs. time curves). I wonder if Ineed to put in the table the values fot t=0 or just the next pointof a curve.

Moreover, I'd like to know how the coefficent of thoserelationships viscoelastic relationship are calculated. Is it theleast square method?

I would be grateful for any help.SolidworksSimulation