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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)
Professor, The Norwegian Institute of Technology, Trondheim,
Senior scientist, SINTEF, Trondheim,
Associate professor, Hiroshima University, Hiroshima,