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Report No.
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Development of stress intensity factors for deep surface cracks in pipes and plates

Hasegawa, Kunio; Li, Y. 

Stress intensity factors (SIFs) for pipes with semi-elliptical cracks containing large aspect ratios were calculated by finite element analysis. The cracks were circumferential and axial surface cracks inside the pipes. The parameters of the SIFs are crack aspect ratio, crack depth and the ratio of pipe radius to wall thickness. In comparing SIFs for plates and pipes, it can be clarified that SIFs for both plates and thin pipes are almost the same, and the SIFs for plates are used as a substitute for pipes. This means that it is not necessary to provide SIF solutions for thin wall pipes, and it is suggested that tables for influence coefficients G values for pipes might reduce to one third.

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