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Modified stress intensity factor equations for semi-elliptical surface cracks in finite thickness and width plates

By Yang Peng, Lewei Tong, Xiao Zhao and Zhigang Xiao

Abstract

Weld defects and severe variation of shape near the welds cause high stress concentration at weld toes or weld roots. This high stress concentration reduces fatigue lives of welded structures. A stress intensity factor (SIF) which includes this effect increases the accuracy of fatigue lives prediction. A magnification factor is commonly used to multiply the SIF of semi-elliptical surface cracks to account for the stress concentration effect in welded connections. Yamada and Hirt model is one of these methods. Comparison between Yamada & Hirt SIF equations and Newman & Raju SIF equations are applied to SIF of semi-elliptical surface cracks. The results suggest that Yamada & Hirt SIF equations are valid when the crack aspect ratio is less than 0.6. New empirical SIF equations are developed based on Yamada & Hirt SIF equations. The newly derived SIF equations are verified by comparing with experimental data

Topics: 0905 Civil Engineering, Stress intensity factor, Surface crack, Crack propagation, Fatigue, Fracture mechanics
Year: 2011
DOI identifier: 10.1016/j.proeng.2011.07.327
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