Abstract
The authors have already derived the equation by which crack opening stress distributions and the resulting stress intensity factors (SIF) can be calculated from the crack opening displacements along a crack, based on the complex-valued formulas on the stress and displacement of a two-dimensional crack. In this study, this equation is used to evaluate the SIF of a three-dimensional crack. For elliptical internal cracks, the SIF at the principal axis could be evaluated theoretically under a plane strain condition from the crack opening displacement distributed in the vertical plane including the principal axis. For surface part-through cracks, the SIF evaluated under a plane stress condition from the crack opening measured along a crack on the specimen surface were in good agreement with the SIF determined from Newman-Raju's equation necessary for both the applied stress and the surface crack shape.
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