Abstract
An analysis of fatigue crack growth, using a fracture mechanics concept, and fatigue tests are performed to quantitively estimate the effect of weld defect (blowhole) size and shape on the fatigue strength of partially penetrated longitudinal welded joints. In this analysis, a blowhole is regarded as a ellipsoidal cavity with small initial cracks along its wall. Number, interval, size and shape of initial cracks are determined by closely observed results on the fatigue crack initiation and propagation from the blowhole. The equivalent circular crack size for a blowhole is presented to predict fatigue life by using a simplified approach. The predicted fatigue life is compared with experimental results.
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