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    Improvement in the Fatigue Strength of Notched Bars by Compressive Self-stresses

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    In this investigation the long-life fatigue strength of sharply notched steel bars was improved by as much as 300 percent with the introduction of compressive self-stresses. Compressive self-stresses were produced by an axial tensile preload. Quantitative estimates of this improvement were made as a function of preload using suitable failure criteria and an analytical estimate of the stable self-stress distribution. The importance of the distribution in depth is demonstrated. A criterion for predicting crack propagation is improved and clarified.


    fatigue (materials), residual stress, stresses, notch strength, yield strength, stress concentration, crack initiation, crack propagation, loads (forces)

    Author Information:

    Gerber, TL
    Engineer, General Electric Co., San Jose, Calif.

    Fuchs, HO
    ProfessorPersonal member of ASTM, Stanford University, Stanford, Calif.

    Committee/Subcommittee: E08.01

    DOI: 10.1520/STP26853S