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    The Resistance of Metals to Cyclic Deformation

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    Fatigue behavior of metals is reviewed with particular emphasis on those properties and parameters which relate to cyclic deformation resistance. Representative data for aluminum-, titanium-, and nickel-base alloys and steels strengthened by various processes are presented to illustrate procedures for characterizing cycle-dependent deformation and fracture behavior.

    The nature and extent of cyclically induced changes in deformation resistance are conveniently described in terms of a cyclic stress-strain curve. A metal's monotonic strain hardening behavior provides an indication of cyclic stability. Fracture behavior is characterized by simple relations in terms of stress resistance, plastic strain resistance, and total strain resistance. True monotonic fracture strength and ductility can be related to fatigue strength and ductility, thus providing useful approximations of life behavior. Indications of notched fatigue resistance can be gained from smooth specimen data through consideration of local stress-strain response. Finally, the utility of such material behavior considerations in arriving at the proper combination of properties to maximize the fatigue resistance of a metal under specified conditions is discussed.


    fatigue (materials), cyclic loads, stresses, strains, hardening (materials), softening, notch strength, evaluation, aluminum alloys, titanium alloys, nickel alloys, steels, deformation

    Author Information:

    Landgraf, RW
    Scientific research staff, Ford Motor Co., Dearborn, Mich.

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP26837S