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Overall damage and elastoplastic deformation in fibrous metal matrix composites. (English) Zbl 0816.73040
A phenomenological constitutive model for the analysis of overall damage and plastic deformation is formulated for a composite system consisting of elastic fibers and an elastoplastic matrix. The formulation is based on the assumption of small strains and an associated flow rule for the matrix material. In this formulation all types of damage experienced by the composite are characterized by a fourth rank damage tensor \(M_{ijkl}\) which transforms the Cauchy stress in the damaged configuration into the stress in the (fictious) deformed configuration without damage.
From the assumptions of elastic fibers and (isotropic) yield function and associated flow rule for the elastoplastic matrix, closed form expressions are derived for the elastoplastic stiffness tensor of the composite system which involve the damage tensor \(M_{ijkl}\). Some interesting features of the analysis include: an anisotropic yield function for the composite based on using a von Mises type yield criterion for the undamaged matrix material, a nonassociated flow rule for the composite, and a generalized kinematic hardening rule resulting from the assumption of a Ziegler-Prager rule for the undamaged matrix.
Reviewer: W.-L.Yin (Atlanta)

74E30 Composite and mixture properties
74R99 Fracture and damage
74C99 Plastic materials, materials of stress-rate and internal-variable type
74A60 Micromechanical theories
74M25 Micromechanics of solids
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