STP519

    Cyclic Inelastic Deformation and the Fatigue Notch Factor

    Published: Jan 1971


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    Abstract

    Cyclic inelastic deformation response and the fatigue notch factor are presented and discussed for two metals of contrasting stress-strain behavior (2024-T351 aluminum alloy and SAE 1015 mild steel). Thin circular or elliptical notch plates fabricated from these metals were subjected to cyclic straining in a servo-controlled testing machine.

    Experimental results obtained from the deformation studies indicate that for small scale confined plasticity, the transient notch response had little effect on nominal deformation resistance. However, as the size of the zone increased or the degree of confinement decreased, transient notch response was reflected in the overall deformation response. These results are discussed in terms of cyclic stress and strain concentration factors and related to notch plate deformation through Neuber's rule. In the low endurance region, the results indicate that the deformation analysis employed, rather than a material “size effect,” is responsible for values of Kf less than Kt.

    Keywords:

    aluminum, steels, test specimens, stress distribution, strain distribution, notch constraint, fatigue (materials), fatigue notch factor, predictions


    Author Information:

    Leis, BN
    Research assistant, assistant professor, and professor, University of Waterloo, Waterloo, Ontario

    Gowda, CVB
    Research assistant, assistant professor, and professor, University of Waterloo, Waterloo, Ontario

    Topper, TH
    Research assistant, assistant professor, and professor, University of Waterloo, Waterloo, Ontario


    Paper ID: STP38028S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP38028S


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