STP636: Effects of Moisture and Fatigue on the Residual Mechanical Properties of S-Glass/Graphite/Epoxy Hybrid Composites

    Hofer, KE
    Senior research engineer, Mechanics of Materials Research Division and experimental engineerIllinois Institute of Technology Research Institute, Chicago, Ill

    Bennett, LC
    Senior research engineer, Mechanics of Materials Research Division and experimental engineerIllinois Institute of Technology Research Institute, Chicago, Ill

    Stander, M
    Materials and processing engineer, Naval Air Systems Command, Washington, D. C.

    Pages: 20    Published: Jan 1977


    Abstract

    The static mechanical properties of S-glass/high-strength graphite/ epoxy hybrid composites were investigated before and after exposure to high humidity for 1000 h. Graphite-to-glass ratios of 0, ∞, 1, and 2 were studied. Both unidirectional (0 deg) and quasi-isotropic fiber orientations were studied.

    In general, the stress cycling caused a decline in the static tensile strength, an increase in the Poisson's ratio, and no change whatever in the elastic modulus of the base and hybrid composites. The addition of moisture did not result in a basic alteration in the behavior of the hybrid or base composites after stress cycling.

    Keywords:

    composite materials, mechanical properties, fatigue strength, residual strength, modulus of elasticity, environmental tests, accelerated aging, hybrid composites


    Paper ID: STP27973S

    Committee/Subcommittee: D30.07

    DOI: 10.1520/STP27973S


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