STP964: A Unique Set of Micromechanics Equations for High-Temperature Metal Matrix Composites

    Hopkins, DA
    Aerospace structures engineer and senior research engineer, National Aeronautics and Space Administration, Lewis Research Center, Cleveland, OH

    Chamis, CC
    Aerospace structures engineer and senior research engineer, National Aeronautics and Space Administration, Lewis Research Center, Cleveland, OH

    Pages: 17    Published: Jan 1988


    Abstract

    A unique set of micromechanics equations is presented for high-temperature metal matrix composites. The set includes expressions to predict mechanical properties, thermal properties, and constituent microstresses for the unidirectional fiber reinforced ply. The equations are derived based on a mechanics of materials formulation assuming a square array unit cell model of a single fiber, surrounding matrix, and an interphase to account for the chemical reaction which commonly occurs between fiber and matrix. A preliminary validation of the equations was performed using three-dimensional finite element analysis. The results demonstrate excellent agreement between properties predicted using the micromechanics equations and properties simulated by the finite element analyses. Implementation of the micromechanics equations as part of an integrated computational capability for nonlinear structural analysis of high-temperature multilayered fiber composites is illustrated.

    Keywords:

    metal matrix composites, composite micromechanics, mechanical properties, thermal properties, uniaxial strengths, microstresses


    Paper ID: STP25950S

    Committee/Subcommittee: D30.07

    DOI: 10.1520/STP25950S


    CrossRef ASTM International is a member of CrossRef.