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    Level-3 Crack-Tip Opening Displacement (CTOD) Assessment of Welded Wide Plates in Bending—Effect of Overmatching Weld Metal

    Published: Jan 1993

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    Butt-welded wide plates with semi-elliptical surface cracks along the fusion line were tested in four-point bending. The material was normalized low-carbon microalloyed steel that conformed to offshore specifications. The testing temperature was in the range of -40° to 0°C. The test results were analyzed by the crack-tip opening displacement (CTOD) Level-3 method that compared different assumptions for the reference strain in order to assess the effect of overmatching weld metal. The original Level-3 plane stress model and a proposed plane strain model with a modified definition of effective primary stress were compared. Consistent results were obtained by the latter method. A detailed finite-element method (FEM) model was validated, and results from comprehensive analyses of welded and nonwelded models are presented.


    crack-tip opening displacement, elastic-plastic fracture mechanics, weldments, wide plate tests, fracture mechanics, defect assessment, structural analysis, fatigue (materials)

    Author Information:

    Berge, S
    Professor, The Norwegian Institute of Technology, Trondheim,

    Eide, OI
    Senior scientist, SINTEF, Trondheim,

    Fujikubo, M
    Associate professor, Hiroshima University, Hiroshima,

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP24274S

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