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    Elastic Analysis of the Interaction Between Two Surface Cracks

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    In this paper, the interacting behavior of two surface cracks in a plate subject to remote tension load perpendicular to the crack fracture surface is investigated based on a combination of the quasi-compatibility element method and the improved front solver method. Stress intensity factors for the two surface cracks are provided in the form of boundary influence factors [normalized stress intensity factor (NSIF)] for a wide range of crack geometries and distances among the cracks. The crack aspect ratio (crack depth-to-length ratio a/c) varied from 1/3 to 1.0, the crack depth-to-plate thickness varied from 1/3 to 2/3, and the distance, 2s, between the two surface cracks varied from 2/3c to 4c. The crack interacting factor was introduced to consider the interacting behavior of three-dimensional (3D) cracks. The degrees of freedom used here were 2529. The use of quasi-compatibility elements combined with the front solver made it possible to conduct analyses of 3D multiple cracks with personal computers. Secondly, an evaluation method for multiple surface cracks is discussed based on the NSIF values from this study.


    brittle fracture, multiple cracks, surface cracks, quasi-compatible elements, singular elements, front solver, personal computer

    Author Information:

    Sun, LK
    Ph.D. student, University of South Carolina, Columbia, SC

    Zhang, L
    Professor, Dalian University of Technology, Dalian,

    Qin, H
    Professor, Dalian University of Technology, Dalian,

    Committee/Subcommittee: E05.06

    DOI: 10.1520/STP16254S