Abstract
This paper reviews the conventional SIF(Stress Intensity Factor) models for semi-elliptical surface cracks in welded joints,namely Newman-Raju-Maddox model and Yamada-Hirt-Albert model.The shortage of Yamada-Hirt-Albert model is pointed out,by which SIF in uniform tension cannot be calculated reasonably.After analysing current research data in the literature,new SIF formulae are developed which modifies Yamada-Hirt-Albert model.It is verified that the improved formulae are more reliable by comparison with Benchmark data and other experimental results published in several literatures.
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