STP857

    Effect of Temperature on the Fatigue and Fracture Properties of 7475-T761 Aluminum

    Published: Jan 1985


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    Abstract

    The effect of low-temperature toughness degradation on damage tolerance and life analysis methodology is discussed. Spectrum fatigue and fatigue crack growth tests were conducted and life predictions made on 7475-T761 aluminum. The retardation behavior was determined by conducting constant K single overload fatigue crack growth tests. The low-temperature environment (−54°C[−65°F]) improved the life of fatigue and fatigue crack growth tests subjected to several loading spectra. This may be partially attributable to stronger retardation effects at low temperatures. It is concluded that low temperature may be a factor in damage tolerance and life analysis only under certain conditions.

    Keywords:

    aluminum alloys, temperature, R, -curve, fatigue, fatigue crack growth, spectrum (loading), life prediction, damage tolerance, retardation


    Author Information:

    Cox, JM
    senior scientistgroup engineerresearch scientist, Fatigue and Fracture Mechanics Laboratory of the Kelly Johnson R&D Center at Lockheed-California Co.Materials and Processes Department of Lockheed-California, Burbank, CA

    Pettit, DE
    senior scientistgroup engineerresearch scientist, Fatigue and Fracture Mechanics Laboratory of the Kelly Johnson R&D Center at Lockheed-California Co.Materials and Processes Department of Lockheed-California, Burbank, CA

    Langenbeck, SL
    senior scientistgroup engineerresearch scientist, Fatigue and Fracture Mechanics Laboratory of the Kelly Johnson R&D Center at Lockheed-California Co.Materials and Processes Department of Lockheed-California, Burbank, CA


    Paper ID: STP32759S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP32759S


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