Hi Kirstie,
The 'd' parameters are inversely proportional to the bulk modulus, so if they are zero, the material is incompressible.
If the material is compressible, you can start with the initial value of d1 = 1/ K1 (initial bulk modulus) and likewise you will need to have data for K2 and K3.
Regards,
Ashish Khemka
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