STP519

    Applications of Finite Element Stress Analysis and Stress-Strain Properties in Determining Notch Fatigue Specimen Deformation and Life

    Published: Jan 1971


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    Abstract

    Finite element elastic-plastic stress analyses were performed on several notched fatigue specimen geometries used in a test program to determine the room temperature and 550 F fatigue strengths of three low strength steels. Specimen geometries included grooved cylinders and wide notched cantilever bend specimens. The analyses were, with one exception, for reversed loading. The objective in these cases was to predict the steady state response of the specimens by using the cyclic stress-strain relationships. The exceptional case represented an initial effort in analyzing a zero-to-tension cycle with a cyclic loading option in the computer program.

    The finite element calculated notch root strains were compared with strains measured during the fatigue experiments and with predictions of the commonly used Stowell and Neuber formulae. A good correspondence was found between the experimental strains and those calculated by the finite element method. The Stowell and Neuber formulae were found to overpredict notch root strains at stress levels beyond the initial plastic range. A good correlation of fatigue crack initiation life data for smooth and notched specimens was found using a recently proposed stress-strain function.

    Keywords:

    stress analysis, fatigue (materials, stresses, strains, stress-strain diagrams, loading, crack initiation, deformation, loads (forces), fatigue tests, steels


    Author Information:

    Mowbray, DF
    Manager, Mechanics of Materials, Gas Turbine Products Div. and senior engineer, Materials and Processes Laboratory, General Electric Company, Schenectady, N. Y.

    McConnelee, JE
    Manager, Mechanics of Materials, Gas Turbine Products Div. and senior engineer, Materials and Processes Laboratory, General Electric Company, Schenectady, N. Y.


    Paper ID: STP38029S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP38029S


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