Volume 35, Issue 1 (January 2007)

    Influence of the Calibration Points on the Spb Parameter Behavior

    (Received 18 September 2003; accepted 10 April 2006)

    CODEN: JTEOAD

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    Abstract

    The present work studies the separability parameter Spb behavior to estimate crack lengths when two or three calibration points are used. A set of precracked and blunt notched specimens with three-point bend ASTM-SE(B) geometry were prepared from three materials: AA 6061-T6 aluminum alloy with different side groove ratio, high-strength low-alloy welded steel, and 2.25Cr-1Mo steel. For each precracked specimen, initial and final crack length were measured on the crack surface. Intermediate crack lengths were determined by two methodologies: the standard elastic unloading and the Spb parameter method using two and three calibration points. The Spb crack lengths were very close to those estimated using the standard methodology; differences between them were less than 15 % Δa, suggested as a difference limit value in ASTM E 1820-99 to alternative methods for measuring crack extension. The performance of Spb parameter was evaluated using two and three calibration points. J-R curves were constructed. The JIQ values obtained by the standard methodology and the Spb method were similar.


    Author Information:

    Wainstein, JE
    Facultad de Ingenitería, Universidad Nacional,

    Cocco, RG
    Facultad de Ingeniería, Universidad Nacional,

    de Vedia, LA
    Instituto de Technología Jorge A. Sábato,

    Cassanelli, AN
    Instituto de Technología Jorge A. Sábato,


    Stock #: JTE100131

    ISSN: 0090-3973

    DOI: 10.1520/JTE100131

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    Author
    Title Influence of the Calibration Points on the Spb Parameter Behavior
    Symposium , 0000-00-00
    Committee E08