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5.8.3 Referentially Isotropic Diffusivity
This material uses a strain-dependent diffusivity tensor that is isotropic in the reference configuration and accommodates strain-induced anisotropy: where is the jacobian of the deformation, i.e. where is the deformation gradient, and is the left Cauchy-Green tensor. Note that the diffusivity in the reference state ( ) is isotropic and given by .