Hi all, I need to have my FE model improved with viscoelasticity. I have searched ABAQUS documentation and read some publications, but still have some questions as followed:

1. Polymer samples have been tested in tension with a constant elongation and a 10mins dwell time. This is regarded as one step and stress relaxation repeated many times in the test. Now curves of strain-stress and time-stress are gained, but I have no idea how to get the viscoelastic parameters.

2. Relaxation test data is considered in the beginning since I have done some relaxation tests. I then found there are shear test data and volumetric test data which obviously are not suitable. Maybe Prony should be used and, I should do curve fitting according to the equations of g_i and k_i? In my case the tau_i should be a constant of 10 mins.

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I am new to this topic and really confused with it. Thank you all!

Thank you all!