I have data for axial tensile test. So I have tensile elastic modulus prony data for general maxwell model. But unfortunately in ANSYS I can only input Shear and Bulk relaxation data (prony input). For isotropic elastic material I can convert E (Young's) to G (Shear) or K (bulk) using possion ratio. Can I do the same for viscoelastic isotropic material? I mean can I convert the uniaxial tensile relaxation data to Shear and Bulk relaxation data? Thanks in advance.
Hi Fuad,
From your question, I understand that you have done a simple tension test at different strain rates followed by stress relaxation to determine the hyper-elastic and linear viscoelastic (Prony) properties. In such case, first fit the tensile data (with the lowest strain rate equivalent to quasi static condition) with Neo Hookean (or other hyperelastic models) and use the C10 value as the elastic modulus and later use the Poission ratio (0.499 in case of rubber) and convert it to shear and bulk data. However, it is always better to do volumetric compression test to arrive at the compressibility values.
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