Matrix Mean-Field and Local-Field Approaches in the Analysis of Metal Matrix Composites
A micromechanical investigation of the inelastic response of metal matrix composites analyzed by two different methodologies is presented. The first method is based on the mean stress field in the entire ductile matrix phase, while the second one is based on the local stress field. The present study is a continuation of a previous investigation in which a micromechanics model based on a periodic array of fibers was employed to generate yield surfaces of metal matrix composites using local and mean matrix stresses. In this paper, we extend the aforementioned analysis to the prediction of the inelastic stress-strain response of metal matrix composites subjected to different loading histories. Results for the overall elastoplastic response of the investigated metal matrix composites indicate that the mean-field approach may lead to significant deviations of the effective composite behavior as compared either to finite element results or measured data. The predictions of the effective composite response generated by the two approaches are compared with experimental and numerical data on unidirectional boron/aluminum and graphite/aluminum.
KeywordsGraphite Boron Posites Work Hardening
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