STP546: Torsional Fatigue Behavior of Unidirectional Resin Matrix Composites

    Novak, RC
    Research scientist, United Aircraft Research Laboratories, East Hartford, Conn.

    Pages: 16    Published: Jan 1974


    Abstract

    Torsional fatigue data are presented for boron/epoxy and graphite/epoxy composites. The failure criterion for the tests is shear modulus reduction. The modulus reduction is shown to be caused by cracks that occur in resin-rich portions of the composites. Resistance to torsional fatigue is found to increase as fiber distribution becomes more uniform and as interfiber distance is decreased.

    Keywords:

    composite materials, graphite composites, boron composites, fiber composites, filaments, graphite, boron, epoxy resins, mechanical properties, fatigue, shear strength, flexural properties, crack propagation failure


    Paper ID: STP35498S

    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP35498S


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