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Journal Articles

Study on flaw-to-surface proximity rule for transforming subsurface flaws to surface flaws based on fatigue crack growth experiments

Hasegawa, Kunio; Li, Y.; Saito, Koichi*

Journal of Pressure Vessel Technology, 137(4), p.041101_1 - 041101_7, 2015/08

 Times Cited Count:3 Percentile:76.7(Engineering, Mechanical)

If a subsurface flaw is located near a component surface, the subsurface flaw is transformed to a surface flaw in accordance with a flaw-to-surface proximity rule. The re-characterization process from subsurface to surface flaw is adopted in all fitness-for-service (FFS) codes. However, the concrete criteria of the re-characterizations are different among the FFS codes. Cyclic tensile experiment was conducted on a carbon steel flat plate with a subsurface flaw at ambient temperature. The objective of the paper is to compare the experiment and calculation of fatigue crack growth behavior for a subsurface flaw and the transformed surface flaw, and to describe the validity of the flaw-to-surface proximity rule defined by ASME Code Section XI, JSME S NA1 Code and other codes.

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