A Comment on Drucker's Postulate in the Theory of Plasticity

Résumé du livre

A general theory of an elastic-plastic continuum, valid for non-isothermal deformations and accompanied by explicit thermodynamical restrictions, was developed recently by Green and Naghdi. A special case of this theory, assuming isothermal conditions, leads to constitutive relations which are equivalent to those which can be derived from Drucker's postulate. Here, we discuss further the implication of Drucker's postulate in connection with a set of constitutive equations for an elastic-plastic continuum in which the postulate need not be satisfied. (Author).