STP636

    Effect of Temperature on Fatigue Response of Surface-Notched [(0/ ± 45/0)s]3 Graphite/Epoxy Laminate

    Published: Jan 1977


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    Abstract

    The fatigue behavior of surface-notched [(0/± 45/0)s]3 T300/5208 graphite-epoxy specimens was studied over the temperature range from room temperature to 421 °F (216 °C). The specimens, after being subjected to two lifetimes of a 135 000-cycle tension-dominated flight-by-flight spectrum, were nondestructively inspected (using tetrabromoethane-enhanced X-ray radiography and C-scanning) and then tested at room temperature to determine their residual strengths. The test results show that both the extent of matrix damage and residual strengths increase with fatigue test temperature. If the fatigue-induced matrix damage region (FIMDR) is the same size or smaller than the delamination region observed prior to static failure, then the residual and static strengths are equal. If the FIMDR is larger than the delamination prior to static failure, then the residual strength is higher than the static strength. Finally, the residual strength is less than the net section strength.

    Keywords:

    composite materials, surface notches, fatigue tests, residual strength, X-ray radiography, C-scan


    Author Information:

    Sendeckyj, GP
    Aerospace engineers, Air Force Flight Dynamics Laboratory, Wright-Patterson Air Force Base, Dayton, Ohio

    Stalnaker, HD
    Aerospace engineers, Air Force Flight Dynamics Laboratory, Wright-Patterson Air Force Base, Dayton, Ohio

    Kleismit, RA
    Aerospace engineers, Air Force Flight Dynamics Laboratory, Wright-Patterson Air Force Base, Dayton, Ohio


    Paper ID: STP27974S

    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP27974S


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