Prediction of Microscopic Interface Crack Onset in Fiber-Reinforced Composites by Using a Multi-Scale Homogenization Procedure

Domenico Bruno; Fabrizio Greco; Lorenzo Leonetti; Paolo Nevone Blasi

doi:10.4028/www.scientific.net/AMR.875-877.1032

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Prediction of Microscopic Interface Crack Onset in Fiber-Reinforced Composites by Using a Multi-Scale Homogenization Procedure

Abstract:

A two-scale method able to carry out a macroscopic failure analysis of a composite structure in presence of microscopic mixed mode interface crack initiation, is proposed. The method is able to accurately predict local failure quantities (fiber/matrix interfacial stresses, energy release and mode mixity for an interface crack) in an arbitrary cell from the results of a macroscopic homogenized analysis. Microscopic crack initiation is thus analyzed by using a coupled stress and energy failure criterion in term of these local quantities. Numerical results are obtained for a plane strain model of a locally periodic fiber-reinforced composite material subjected to shear loading and characterized by initially undamaged fiber/matrix interfaces. Predictions for the critical load factor and interface crack length at crack onset obtained by the proposed model are compared with those obtained by means of a direct simulation.