EFFECTIVE ELASTOPLASTIC DAMAGE MODEL FOR FIBER REINFORCED METAL MATRIX COMPOSITES WITH EVOLUTIONARY COMPLETE FIBER DEBONDING

Abstract eng:
A micromechanical damage model is proposed to predict the overall elastoplastic behavior and interfacial damage evolution of fiber-reinforced metal matrix composites. Progressive, completely debonded fibers are replaced by voids. The effective elastic moduli of three-phase composites, composed of a ductile matrix, randomly located and unidirectionally aligned circular fibers, and voids, are derived by using a micromechanical formulation. In order to characterize the overall elastoplastic behavior, an effective yield criterion is derived based on the ensemble-area averaging process and the first-order effects of eigenstrains. The proposed effective yield criterion, together with the overall associative plastic flow rule and the hardening law, constitutes the analytical framework for the estimation of effective elastoplastic responses of metal matrix composites containing both perfectly bonded and completely debonded fibers. An evolutionary interfacial fiber debonding process, governed by the internal stresses of fibers and the interfacial strength, is incorporated. Further, the Weibull's statistical function is employed to describe the varying probability of complete fiber debonding. Finally, comparison between the present predictions and available experimental data and various numerical simulations are performed.

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