Expert View

Recharacterization of Subsurface Flaw to Surface Flaw Based on Equivalent Fatigue Crack Growth Rate

[+] Author and Article Information
Valery Lacroix

Tractebel Engineering,
Avenue Ariane 7,
Brussels 1200, Belgium
e-mail: valery.lacroix@gdfsuez.com

Yinsheng Li

Japan Atomic Energy Agency (JAEA),
Tokai-mura, Naka-gun,
Ibaraki-ken 319-1195, Japan
e-mail: li.yinsheng @jaea.go.jp

Bohumir Strnadel

Center of Advanced Innovation Technologies,
VSB-Technical University of Ostrava,
17. Listopadu 15, Poruba,
Ostrava 70800, Czech Republic
e-mail: bohumir.strnadel@vsb.cz

Kunio Hasegawa

Fellow ASME
Center of Advanced Innovation Technologies,
VSB-Technical University of Ostrava,
17. Listopadu 15, Poruba,
Ostrava 70800, Czech Republic
e-mail: kunioh@kzh.biglobe.ne.jp

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received April 21, 2015; final manuscript received September 28, 2015; published online November 19, 2015. Assoc. Editor: David L. Rudland.

J. Pressure Vessel Technol 138(2), 024701 (Nov 19, 2015) (6 pages) Paper No: PVT-15-1073; doi: 10.1115/1.4031723 History: Received April 21, 2015; Revised September 28, 2015

A subsurface flaw located near a component surface 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 criteria of the recharacterizations are different among the FFS codes. In addition, the proximity factors in the rules are generally defined by constant values, irrespective of flaw aspect ratios. This paper describes the stress intensity factor interaction between the subsurface flaw and component free surface and proposes a proximity factor from the point of view of fatigue crack growth rates.

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Grahic Jump Location
Fig. 1

Transformation of a subsurface flaw (flaw A) near component free surface and a similar subsurface flaw (flaw B) in the center of a plate

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Fig. 2

Fracture surface of flat plate specimen

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Fig. 3

Beach marks to determine proximity factor

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Fig. 4

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

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Fig. 5

Mesh at cross section for centered subsurface flaw in flat plate

Grahic Jump Location
Fig. 6

Stress intensity factor interaction for subsurface flaws

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Fig. 7

Ratio of fatigue crack growth rates for subsurface flaws near free surface and in the center of the plate

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Fig. 8

Distance from free surface under equivalent stress intensity factor interaction

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Fig. 9

Proximity factor under equivalent stress intensity factor interaction

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Fig. 10

Proposal of proximity factor Y




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