Abstract
We study the essential theoretical foundations to construct a model which represents the mechanical and thermodynamical behaviour of a real material. Particular reference is made to the case where the classical model of Cauchy's continuum is not sufficient. Special attention is devoted to distinguishing between the constitutive features of the material on the one hand and what results from the postulated physical principles on the other. The subject develops on general lines and allows us to point out possible advances consistent with our assumptions. Finally we apply the proposed theory to prove an important restriction on the admissible constitutive equations.
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