A GENERAL THEORY FOR SIMULATING THE BEHAVIOR OF ANISOTROPIC ELASTOPLASTIC MATERIAL

S. OLLER; E. OÑATE

Congreso; MECOM-96 - AMCA; 1996

The paper describes a hygro-thereto-mechanical constitutive model appropriate for numerical simulation of multiphase composite material behaviour. The theory is based on the mixture of the basic substances of the composite and allows to evaluate the inter-dependent behaviour between the different compounding constitutive models. The initial. anisotropy of each compounding can be taken into account by means of a mapped isotropic plastic formulation. This is a generalization of classic isotropic plasticity theory applied to orthotropic or anisotropic materials. The basic asstunption is the existence of a stress and strain real anisotropic spaces and the respective fictitious isotropic spaces where a nmpped fictitious problem is solved. Those spaces are related by means of two fourth order transformation tensor. The combination of miring (harry and the mapped isotropic plastic approach provides a powerful constitutive framework for the numerical treatment of bulk-fiber composite materials.