Hello, first off all my question may be badly formulated since this is my first interaction with viscoelastic behavior, from what I understand the creep compliance is somehow the equivalent of the compliance matrix in elasticity except for the fact that it is depended on time ( and maybe temperature) because it takes into account the the viscous behavior of the material.

From what i understand, in order to "separate" the viscous behavior from elastic behavior we need to subject our samples to constant loads over a period of time, thus we obtain strain vs time graphs for different loads which helps us see if the material is linear viscoelastic or nonlinear by analyzing the isochronals.

Now back to my question, it appears to me that the simplest way to determine the creep compliance tensor components, do we use the data obtained from the constant loading tests I mentioned earlier, specifically the isochronals obtained for every moment to calculate the every particular component of creep compliance tensor at that moment, and then use some kind of mathematical fitting (power laws for example) to obtain the creep compliance as a function of time.

Please tell me if the method that I explained is the way to proceed or if it's just nonsense.