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Research Papers: Codes and Standards

Study on Flaw-to-Surface Proximity Rule for Transforming Subsurface Flaws to Surface Flaws Based on Fatigue Crack Growth Experiments

[+] Author and Article Information
Kunio Hasegawa, Yinsheng Li

Japan Atomic Energy Agency (JAEA),
Tokai-mura,
Naka-gun, Ibaraki-ken 319-1195, Japan

Koichi Saito

Hitachi Works,
Hitachi-GE Nuclear Energy Ltd.,
Omika-cho,
Hitachi-shi, Ibaraki-ken 319-1221, Japan

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received June 20, 2014; final manuscript received August 15, 2014; published online February 20, 2015. Assoc. Editor: David L. Rudland.

J. Pressure Vessel Technol 137(4), 041101 (Aug 01, 2015) (7 pages) Paper No: PVT-14-1092; doi: 10.1115/1.4028423 History: Received June 20, 2014; Revised August 15, 2014; Online February 20, 2015

If a subsurface flaw is located very near a component surface, the subsurface flaw is categorized as a surface flaw. The boundary of the subsurface and surface flaws is required for flaw evaluation. The subsurface flaw is transformed to a surface flaw in accordance with a flaw-to-surface proximity rule. The recharacterization process from subsurface to surface flaw is adopted in all fitness-for-service (FFS) codes. However, the specific criteria of the recharacterizations 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 check 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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Figures

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Fig. 3

Definition of subsurface and surface flaws

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Fig. 2

Flat plate block with a surface notch

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Fig. 6

Fatigue crack growth of specimen FE 10-2

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Fig. 7

Fatigue crack growth of specimen FE 25-2

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Fig. 8

Fatigue crack growth of specimen FE 40-2

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Fig. 9

Fatigue crack growth of specimen FE 50-2

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Fig. 1

Subsurface and surface flaws transformed from subsurface flaw

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Fig. 10

Proximity factor Y (=S/a) obtained by experiments

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Fig. 4

Fracture surface of flat plate specimen

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Fig. 5

Fatigue crack growth of specimen FE 10-1

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