Abstract
The general formalism which was previously developed for partial differential equations of balance type is employed to determine the infinitesimal generators (or isovector fields in the language of exterior calculus) inducing the symmetry group associated with radial motions of a heterogeneous isotropic hyperelastic material. The most general group structure is found and the results obtained are applied to a heterogeneous Ko material in which the initial density and the modulus of the material vary according to certain power laws. The nonlinear ordinary differential equations satisfied by the similarity solution corresponding to the symmetry group admitted by the material are provided.
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