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    Experimental Characterization of Cracks at Open Holes and in Rounded-End Straight Attachment Lugs

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    The paper focuses on the application of the frozen-stress photoelastic technique to an assessment of various engineering solutions from the literature for several hole-related crack problems. Single corner, transitioning, and through-the-thickness cracks are examined. Remote tensile loading of a plate containing an open hole and 100% load transfer through a rigid pin in a rounded-end lug is considered.

    Experimental evidence demonstrates the presence of stress intensity factor (SIF) gradients for every crack configuration. Good correlation with existing SIF solutions is found for the through-the-thickness configuration in lugs. Less conclusive are the comparisons with engineering estimates for corner cracks emerging from open holes and lug. The transitioning behavior of a part-through crack is also discussed. Finally, modeling aspects of three-dimensional fracture problems are examined.


    damage tolerance, mechanical joints, part-through cracks, stress intensity factor, frozen-stress photoelasticity

    Author Information:

    Nicoletto, G
    Researcher, Istituto di Meccanica Applicata alle Macchine, University of Bologna, Bologna,

    Committee/Subcommittee: E08.04

    DOI: 10.1520/STP29059S