STP1231

    A Computer-Aided Technique for the Determination of R-Curves from Center-Cracked Panels of Nonstandard Proportions

    Published: Jan 1994


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    Abstract

    The development of a technique for the measurement of fracture toughness using computer-aided data collection and analysis has greatly reduced the computation time, increased accuracy, and enabled crack resistance curves to be determined from center-cracked panels of nonstandard geometries. The effective crack length is determined from compliance measurements and a geometric correction to stress intensity factor for nonstandard geometries derived from fatigue crack growth data and from energy release-rate calculations. Fracture toughness tests have been conducted on panels up to 2 m wide with a length-to-width ratio of 0.5.

    The technique is illustrated using results showing the effect of panel size and geometry for the 2024-T3 aluminum alloy.

    Keywords:

    fracture toughness, R, -curves, aluminum alloy, stress intensity factor, test automation, fracture (materials), fatigue (materials), testing methods, data analysis


    Author Information:

    Sutton, GR
    Defence Research Agency, Farnborough,

    Thomas, CE
    Defence Research Agency, Farnborough,

    Wheeler, C
    Defence Research Agency, Farnborough,

    Wilson, RN
    Defence Research Agency, Farnborough,


    Paper ID: STP13949S

    Committee/Subcommittee: E08.04

    DOI: 10.1520/STP13949S


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