STP617: Environmental Sensitivity Tests of Graphite-Epoxy Bolt Bearing Properties

    Wilkins, DJ
    Project structures engineer, General Dynamics, Fort Worth, Tex.

    Pages: 17    Published: Jan 1977


    Abstract

    Over 200 tests were performed to study the effects of moisture and temperature on typical graphite-epoxy bolted joints. Three test specimen types were used: unnotched control laminates, filled-hole specimens containing an unloaded fastener, and bearing specimens. Five typical laminate orientations were studied. Standard 1/4-in. straight-shank fasteners were used with bolt torques varying from zero to specification values. Two types of moisture conditioning were employed: hygrothermal and conditioning with thermal spikes to 300°F superimposed on the hygrothermal background. Test temperatures were 75 and 200°F. A summary of results shows that many of the test conditions produced no significant effects. The maximum reduction from room temperature, dry performance to hot, wet performance was 18 percent.

    Keywords:

    composite materials, laminates, joints (junctions), mechanical properties


    Paper ID: STP26962S

    Committee/Subcommittee: D30.05

    DOI: 10.1520/STP26962S


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