Abstract
The nature of the crack tip singularity changes in the vicinity of a corner point where a crack front intersects a free surface. The existence of corner point singularities, and their main features, have been known for some time, but lack of appropriate numerical information makes it difficult to extract practical implications. Corner point singularities do not normally have to be taken into account in the consideration of Mode I fatigue crack growth, but this may be necessary for mixed mode loadings, particularly for those special cases where mixed mode fatigue crack growth takes place. They have to be considered in the numerical derivation of stress intensity factors for three-dimensional mixed mode configurations. In these cases the widely used semi-elliptical crack approximation is not a good model of a part-through crack. A symmetrical part-elliptical crack is more appropriate. Approximate expressions have been obtained for the critical intersection angle at which a crack front tends to intersect a free surface.
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