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    Review of Factors That Affect Fatigue Strength of Low-Alloy Steel Fasteners

    Published: 01 January 1995

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    Axial-load-cycling fatigue tests of threaded fasteners are useful in determining fastener fatigue failure or design properties. By using appropriate design factors between the failure and design fatigue strengths, such tests are used to establish fatigue failure and design parameters of fasteners for axial and bending cyclic load conditions. This paper reviews the factors that influence the fatigue strength of low-alloy-steel threaded fasteners, identifies those most significant to fatigue strength, and provides design guidelines based on the direct evaluation of fatigue tests of threaded fasteners. Influences on the fatigue strength of the thread manufacturing process (machining and rolling of threads) and the effect of fastener membrane and bending stresses, thread root radii, fastener sizes, fastener tensile strength, stress relaxation, mean stress, and test temperature are discussed.


    load-controlled fatigue, thread fatigue, machined, ground, rolled threads, lowalloy steel fasteners, mean stress effects

    Author Information:

    Skochko, GW
    Senior engineer, Westinghouse Electric Corp., Schenectady, NY

    Herrmann, TP
    Manager, Mechanical Analysis, Westinghouse Electric Corp., Schenectady, NY

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP13045S