Micromechanical Characterization of Damage-Plasticity in Metal Matrix Composites

by George Z. Voyiadjis, Louisiana State Univ, Baton Rouge, United States,
Peter I. Kattan, Louisiana State Univ, Baton Rouge, United States,



Document Type: Proceeding Paper

Part of: Engineering Mechanics

Abstract:

A micromechanical theory of damage mechanics and plasticity is proposed for fiber-reinforced metal matrix composites. The composite system is assumed to consist of elastic, continuous and aligned fibers embedded into an elastoplastic matrix. The damage model is based on the concept of effective stress with small strains. Two approaches are considered and compared in the formulation. One is overall and the other is local in the sense that damage is considered at the constituent level. A new yield criterion, flow rule and kinematic hardening rule are derived for the damaged composite system for the two approaches considered.

Subject Headings: Composite materials | Plasticity | Micromechanics | Metals (material) | Matrix (mathematics) | Kinematics | Fiber reinforced composites

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