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    Extraction of Stress-Intensity Factor from In-Plane Displacements Measured by Holographic Interferometry

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    Utilizing the well-known Westergaard approach in conjunction with Goursat-Kolosov series stress functions, suitable series solutions are developed for stresses and displacements around the crack tip. In-plane displacement data from the entire field near the crack tip are obtained by holographic interferometry. Measurement errors in the experimental data are minimized by the least-squares method. Series solution of displacements together with experimental data is used to establish the loss of inverse square-root singularity at the free surface-crack border intersection. Experimental results are compared with the analytical results from recent studies, and a good correlation is found between analytical and experimental values.


    holographic interferometry, in-plane displacements, surface stress-intensity factor, free surface-crack border intersection, holographic moiré, stress singularity, eigenvalue

    Author Information:

    Dally, JW
    Professor, University of Maryland at College Park, College Park, MD

    Sciammarella, CA
    Professor, Illinois Institute of Technology, Chicago, IL

    Shareef, I
    Assistant professor, Bradley University, Peoria, IL

    Committee/Subcommittee: E08.03

    DOI: 10.1520/STP23431S