A MIXING ANISOTROPIC FORMULATION FOR THE COMPOSITES BEHAVIOUR SIMULATION

S. OLLER; E. OÑATE; J. MIQUEL

Conferencia; International Conference on Composites Engineering (ICCE/1); 1994

In this paper is presented the general mixing theory applied to the numerical simulation ofmultiphase composite material behaviour. This theory is based on the mixture of the basicsubstances of the composite and allow evaluate the inter-dependence behaviour between thedierent compounding constitutive models. So then, mixing theory is used to propose a non linear implicit constitutive theory for n-phases composite materials. Also, the initial anisotropy of each compounding is treated in the present work by mean of the mapped isotropic plastic formulation. It approach is a generalization of the classic isotropic plasticity theory to be applied to orthotropic or anisotropic materials. Assume the existence of a stress and strain real anisotropic spaces, and the respective ctitious isotropic spaces where a mapped ctitious problem is solved. Those spaces are relating by means two fourth order transformation tensor. These both formulation joined establishing a powerful work-tool for the treatment of bulk composite materials. The induced anisotropy behaviour is take into account by each compounding constitutive formulation. Examples of application shows the good performance of the mixing anisotropy theory for the simulation of bulk composite materials.