A three-dimensional damage model to simulate the progressive failure of composite structures

Abstract

A three-dimensional damage model has been developed to simulate the progressive failure of thin composite structures. Both intralaminar and interlaminar damage mechanisms have been considered and the proposed constitutive model has been developed on the basis of thermomechanics of the nonlinear irreversible physical process. The intralaminar damage modes has been analysed in the context of the Continuum Damage Mechanics, whereas the interlaminar damage mode has been analysed by means of the Cohesive Zone Model. The objectivity of the numerical discretization has been assured using the smeared crack formulation. The proposed damage model has been benchmarked by means of an experimental low-velocity impact test taken from the Literature, reproducing the main damage mechanisms, i.e. fibre breakage, fibre kinking, matrix cracking, matrix crushing and delaminations