Hello,

I have no experience in modelling such material. Also I am not familiar with the formula you have stated, but it looks like a form of stress relaxation or creep definition.

I will try to explain how I would model your case, but please note, that I am as well learning how to model hyper-visco response.

[B]Density [/B]- could be explicitly defined for a model

[B]Short term shear modulus[/B] - could be used as an input to neo-hookean hyperelastic model, where the constant is G/3 (not sure about that, but you could probably look for it on google)

- If short term means instantaneous response, make sure you select this option on neo-hookean model in abaqus

[B]Long term shear modulus[/B] - I would compare it to the short term one and then use this for aproximation of stress-relaxation test data

Example:

short term = 30, long term = 15 -> this will result in a stress relaxation data leadingsomething like this:

time coef

0 1

1000 0.5

(the 1000 is the infinite time and 0.5 is the proportion of long term to short term G)

[B]Decay[/B] - no idea