Volume 2, Issue 6 (June 2005)

    A New Method for Opening Load Determination from Compliance Measurements

    (Received 3 November 2003; accepted 14 September 2004)

    Published Online: 2005

    CODEN: JAIOAD

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    Abstract

    A brief review of the most popular compliance based methods for determination of the crack opening load is included in the introduction. This review reveals the demand for a noise resistant method that is especially needed in the near-threshold region where a partial crack closure prevails and the existing ASTM method does not calculate the correct opening load. With this in mind, a new technique was developed (‘Q’ method). It uses integration instead of differentiation of the compliance data. It also accounts for the partial crack closure situations. The derivation of the Q method is discussed together with its relation to the ASTM procedure, and both methods were used to analyze experimental data of 2324-T39 and 7475-T7351 Al alloys tested at 0.1 and 0.9 load ratios. On average the crack opening load values from the Q method are smaller by the factor of about 2/π in comparison to those obtained from the ASTM procedure.


    Author Information:

    Kujawski, D
    Professor, and Graduate Student, Western Michigan University, Department of Mechanical and Aeronautical Engineering, College of Engineering and Applied Sciences, Kalamazoo, MI

    Stoychev, S
    Professor, and Graduate Student, Western Michigan University, Department of Mechanical and Aeronautical Engineering, College of Engineering and Applied Sciences, Kalamazoo, MI


    Stock #: JAI12017

    ISSN: 1546-962X

    DOI: 10.1520/JAI12017

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    Author
    Title A New Method for Opening Load Determination from Compliance Measurements
    Symposium Fatigue and Fracture Mechanics: 34th Volume, 2003-11-21
    Committee E08