Performed in this paper is a micromechanics analysis of a representative volume element in a metal matrix composite. assuming the matrix is viscoplastic and based on experimental evidence, time dependent microcracks are assumed to evolve as a function of load history at the fiber-matrix interface. a maximum shear stress criterion at the interface is assumed to control microcrack growth. because both the constitutive equations and the time dependent internal boundary ...
To model the viscoplasticity of composites containing voids and/or microcracks the benveniste reinterpretation of the elastic version of the mori- tanaka method is extended. to yield the instantaneous tangent stiffness for use in the micromechanics model the matrix unified viscoplasticity equations of miller are cast in a total strain formulation. the composite strain rate is given in terms of the matrix stress rate, for steady state creep. initial yield surfaces ...
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