STP677: Effect of Biaxial Stresses on Crack Growth

    Liu, AF
    Senior technical specialist and senior engineers, Northrop Corp., Aircraft Group, Hawthorne, Calif.

    Allison, JE
    Graduate student, Carnegie-Mellon University, Pittsburgh, Pa.

    Dittmer, DF
    Senior technical specialist and senior engineers, Northrop Corp., Aircraft Group, Hawthorne, Calif.

    Yamane, JR
    Senior technical specialist and senior engineers, Northrop Corp., Aircraft Group, Hawthorne, Calif.

    Pages: 18    Published: Jan 1979


    Abstract

    This paper presents the results of a systematic evaluation of biaxial loading on fatigue crack propagation behavior using experimental techniques, and determines the accuracy with which a current advanced state-of-the-art analytical approach can predict this behavior. These results provide data for evaluating biaxial loading effects on crack propagation.

    The effects of both biaxial stress ratio and applied stress level have been evaluated by conducting crack propagation tests on cruciform specimens made of 7075-T7351 and 2024-T351 aluminum alloys. Tests were conducted at various biaxial stress ratios (-1.5 ⩽ σxy ⩽ 1.75). The magnitudes of the applied stress were from 20 to 60 percent of the material tensile yield strength. Test results indicate that biaxial stress states contribute a negligible effect on fatigue crack propagation rate as compared to data developed from uniaxial loading conditions.

    Keywords:

    biaxial loading, crack propagation, fracture mechanics, metals, structures, fatigue (materials)


    Paper ID: STP34903S

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP34903S


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