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    Lower-Bound Solutions and their Application to the Collapse Load of a Cracked Member Under Axial Force and Bending Moment

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    The lower bound of collapse load of an edge-cracked member subjected to axial force and bending moment is remarkably improved by introducing the statically admissible stress field in plane-strain and plane-stress conditions. A procedure for the calculation of collapse load of a member with a surface flaw is also proposed. In addition, a method of evaluation of the J-integral for compact specimen is derived by using the aforementioned lower-bound solution. Finally, the applicability of the failure assessment diagram through the collapse load and fracture toughness is confirmed experimentally and numerically under the combined loading of bending and tension, as long as the JIc criterion is valid.


    fracture (materials), cracks, plasticity, plastic deformation, collapse load, surface flaw, compact specimen, J-integral, elastic-plastic fracture, fracture mechanics, failure assessment diagram, limit analysis

    Author Information:

    Okamura, H
    Professor, University of Tokyo, Tokyo,

    Kageyama, K
    Mechanical Engineering Laboratory, Agency of Industrial Science and Technology, MITI, Ibaraki,

    Takahata, Y
    Yanmar Diesel Engine Co. Ltd., Osaka,

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP36771S