STP580

    Tensile Properties of an Ultrahigh-Strength Graphite Fiber in an Epoxy Matrix

    Published: Jan 1975


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    Abstract

    The fiber performance and potential as a reinforcement for fiber composites of a special PAN-based graphite fiber were evaluated by testing the fiber's tensile properties in an epoxy matrix. Representative strand samples were taken from 30 spools (∼4 kg) of single-end, 1500-filament fiber to make over 5000 fiber-epoxy strand specimens using the filament-winding process. Characteristics studied were fiber uniformity, strength and modulus distributions at room and liquid nitrogen temperatures, stress-strain behavior, the effect of strain rate on fiber strength, and acoustic emission during tensile loading to failure. The fiber was found to have a 3570-MPa (517 ksi) failure stress, a 1.7 percent failure strain, a 206-GPa (30 × 106 psi) modulus, and a density of 1.77 Mg/m3 at 23 °C (73 °F). Liquid nitrogen temperature and various strain rates had no significant effect on fiber tensile properties.

    Keywords:

    composite materials, carbon fibers, epoxy resins, fibers, performance, acoustics, emission


    Author Information:

    Chiao, TT
    Chemist, mechanical engineer, and technical associate, University of California, Lawrence Livermore Laboratory, Livermore, Calif.

    Hamstad, MA
    Chemist, mechanical engineer, and technical associate, University of California, Lawrence Livermore Laboratory, Livermore, Calif.

    Jessop, ES
    Chemist, mechanical engineer, and technical associate, University of California, Lawrence Livermore Laboratory, Livermore, Calif.


    Paper ID: STP32336S

    Committee/Subcommittee: D30.07

    DOI: 10.1520/STP32336S


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