Hi,

Greatly appreciate if anybody on this forum could explain this bit, which is attributed to rubber modelling! Basically, I am wondering, in the case of linear viscoelastic model and if I would like to use a long - term modulus in CAE or input file, what value should be inserted into a cell for elastic material definitions: long term shear modulus or elastic modulus? According to Abaqus documentation, Prony series are normalised by shear modulus (either in long term or instantaneous), but somewhat vaguely written (or maybe I have simply skipped it) how should be represented elastic region in terms of shear modulus or elastic modulus? Please disregard the case when hyperelastic model is provided. 

A sample input file commands:

* ELASTIC, MODULI=LONG TERM 

20  -  is that shear modulus or elastic modulus??

* VISCOELASTIC, FREQUENCY = DOMAIN

and so on and so forth

I would be very grateful for your piece of advice and information beforehand!

Regards,