An Equation for Bolt Clampup Relaxation in Transient Environments

    Volume 4, Issue 4 (December 1982)

    ISSN: 0884-6804

    CODEN: CTROAD

    Page Count: 4


    Crews, JH
    Senior engineer, NASA Langley Research Center, Hampton, VA

    Shivakumar, KN
    National Research Council resident research associate, NASA Langley Research Center, Hampton, VA

    Abstract

    The viscoelasticity of resin-based laminates allows the clampup force on bolts to relax, with a corresponding degradation in joint strength. We have studied clampup relaxation for steady temperature and moisture (T-M) conditions [1], but in typical applications laminate temperature and moisture both vary with time. These transient conditions influence clampup in two ways: first, the laminate thermal expansion (contraction) and moisture swelling (shrinkage) cause elastic changes in the clampup, and second, the T-M conditions influence the rate of clampup relaxation.


    Paper ID: CTR10776J

    DOI: 10.1520/CTR10776J

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    Author
    Title An Equation for Bolt Clampup Relaxation in Transient Environments
    Symposium , 0000-00-00
    Committee D30