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    Micromechanical Modeling of Yielding and Crack Propagation in Unidirectional Metal Matrix Composites

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    A two-dimensional finite element micromechanics analysis was used to predict the response of a unidirectional graphite/aluminum composite subjected to transverse tensile, longitudinal shear, or axial-transverse tensile biaxial loadings. Processing-induced thermal residual stresses and the temperature dependence of the highly nonlinear aluminum matrix properties were included, along with the anisotropy of the graphite fibers. A parametric study was made of the influence of matrix heat treatment condition and fiber-matrix interface bond strength on composite response to the various loadings. The correlations with available experimental data suggested that the actual composite material may have been in an intermediate heat treat condition, and a moderate interface strength degradation state.


    metal matrix composites, graphite/aluminum composites, unidirectional composites, micromechanics analysis, crack propagation

    Author Information:

    Adams, DF
    Professor of Mechanical Engineering, director Composite Materials Research Group, University of Wyoming, Laramie, WY

    Committee/Subcommittee: D30.07

    DOI: 10.1520/STP25946S