STP1131

    Matrix Cracks and Interphase Failure in Transversely Loaded Fiber Composites

    Published: Jan 1992


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    Abstract

    Interphases in a unidirectionally fiber-reinforced composite with hexagonal packing are modeled by the spring-layer model. The composite is subjected to transverse tensile loading. A critical value of the circumferential stress (σθ) at the matrix side of the interphase is taken as a criterion for the initiation of radial matrix cracks, while interphase failure is assumed to occur when the interphase strain energy density (U) exceeds a critical value. All numerical calculations have been carried out by the use of the boundary-element method. For a perfect composite, the results show σθ and U for various values of the interphase stiffnesses. For a composite that develops radial matrix cracking, U has been computed and the proclivity towards subsequent interphase failure is discussed. Conversely, for a composite that first develops interphase failure, σθ has been calculated to determine the tendency towards subsequent radial matrix cracking.

    Keywords:

    fiber composites, interphase failure, matrix cracks, fracture mechanics, fatigue (materials)


    Author Information:

    Zhu, H
    Post-doctoral fellow and professor, Center for Quality Engineering and Failure Prevention, Northwestern UniversityThe University of Tennessee, EvanstonKnoxville, ILTN

    Achenbach, JD
    Post-doctoral fellow and professor, Center for Quality Engineering and Failure Prevention, Northwestern UniversityThe University of Tennessee, EvanstonKnoxville, ILTN


    Paper ID: STP23716S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP23716S


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