STP601

    Notch-Yield Ratio as a Quality Control Index for Plane-Strain Fracture Toughness

    Published: Jan 1976


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    Abstract

    The ratio of notch-tensile strength to tensile-yield strength (the notch-yield ratio) is correlatable with plane-strain fracture toughness, KIc. As a result of that fact and relative simplicity of notch-tension testing, it is suitable for plant quality control testing for fracture toughness. The test procedures and quality control testing practices are described, and data showing the correlation between KIc and notch-yield ratio from both ½ and 1 1/16-in.-diameter notched tension specimens for several aluminum alloys are presented. The 1 1/16-in.-diameter specimen provides a more discriminating correlation at high toughness levels than does the ½-in.-diameter specimen. It is emphasized that this is not a procedure for estimating KIc directly, but for providing assurance that KIc equals or exceeds a stated value.

    Keywords:

    crack propagation, fracture properties, quality control, notch sensitivity, notch tests


    Author Information:

    Kaufman, JG
    Senior engineering associate, senior engineer, statistical analyst, and group leader, Aluminum Company of America, Alcoa Laboratories, Alcoa Center, Pa.

    Sha, GT
    Senior engineering associate, senior engineer, statistical analyst, and group leader, Aluminum Company of America, Alcoa Laboratories, Alcoa Center, Pa.

    Kohm, RF
    Senior engineering associate, senior engineer, statistical analyst, and group leader, Aluminum Company of America, Alcoa Laboratories, Alcoa Center, Pa.

    Bucci, RJ
    Senior engineering associate, senior engineer, statistical analyst, and group leader, Aluminum Company of America, Alcoa Laboratories, Alcoa Center, Pa.


    Paper ID: STP28644S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP28644S


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