Abstract
In this paper the maximum value of SIF along a crack front can be expressed by the weight function method for a flat plate model with a circular hole loaded in uniform biaxial tension after some suitable reduction and approximation. After considering several factors. ((1) the crack surface loaded by internal pressure; (2) the influence of circumferential stress for the nozzle; (3) the influence of the shape of the opening) and after introducing an oblique angle correction factor, a curvature correction factor and the front free face correction factor, the approximate expressions of maximum value of SIF of oblique nozzle corner cracks are obtained. Comparing the results of these approximate expressions with those in the literature shows good agreement, the discrepancies being less than 13%. This shows the effectiveness of these approximate expressions.
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