I am modelling a hyperelsatic and viscous material in ABAQUS. I have calculated the hyperelasticity parameters using curve fitting. Now, for viscoelasticity, I have stress relaxation results in terms of shear modulus variation with time. While inputting the data into Abaqus, you need two parameters G0 and Ginf along with the experimental results. So i think G0 is the shear modulus at the beginning of relaxation test and Ginf is defined based on hyperelastic parameter(2*C0 for Yeoh Or similar for other models)? Am I correct or else?
Yes, you're correct that the initial shear modulus is the value at the beginning of the relaxation test, representing the unrelaxed modulus. The long-term shear modulus represents the fully relaxed state of the material after sufficient time has passed. In models like Yeoh, the long-term modulus can be approximated using the first hyperelastic parameter from the curve fitting. For other hyperelastic models, the long-term modulus is similarly related to the fitted parameters. These values, along with your experimental data, are needed in ABAQUS for accurate viscoelastic modeling. BTW have you used MCalibration (Link: https://www.youtube.com/watch?v=5G1uX7m5rIU ) software for curve fitting? It will work for you easily.
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