On the Uniqueness and Stability of Endochronic Theories of Material Behavior

Abstract

A stability and uniqueness analysis of endochronic models without internal barriers has been performed by means of the construction of certain simple dynamic problems. It has been shown that serious difficulties can arise when such models are used and that they are unsuitable for the numerical solution of mechanical problems. The deficiencies in the endochronic models may be circumvented by the introduction of internal barriers, but these have much the same features as the yield condition of classical plasticity.