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Research Papers: Materials and Fabrication

Remaining Lives of Fatigue Crack Growths for Pipes With Subsurface Flaws and Subsurface-to-Surface Flaw Proximity Rules

[+] Author and Article Information
Genshichiro Katsumata

Japan Atomic Energy Agency (JAEA),
Shirakata,
Tokai-mura, Ibaraki-ken 319-1195, Japan
e-mail: katsumata.genshichiro@jaea.go.jp

Yinsheng Li

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

Kunio Hasegawa

Center of Advanced Innovation Technologies
-VSB-Technical University of Ostrava,
17. listopadu15,
Ostrava-Poruba 708 00, Czech Republic
e-mail: kunioh@kzh.biglobe.ne.jp

Valery Lacroix

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

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received September 28, 2015; final manuscript received February 4, 2016; published online April 29, 2016. Assoc. Editor: David L. Rudland.

J. Pressure Vessel Technol 138(5), 051402 (Apr 29, 2016) (5 pages) Paper No: PVT-15-1221; doi: 10.1115/1.4032816 History: Received September 28, 2015; Revised February 04, 2016

If a subsurface flaw is located near a component surface, the subsurface flaw is transformed into a surface flaw in accordance with a subsurface-to-surface flaw 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. Recently, the authors have proposed a new subsurface-to-surface flaw proximity rule based on experimental data and equivalent fatigue crack growth rate calculations. In this study, fatigue crack growth calculations were carried out for pipes with subsurface flaws, using the proximity rule provided in the current ASME (American Society of Mechanical Engineers) Section XI and JSME (The Japan Society of Mechanical Engineers) codes and the proposed subsurface-to-surface flaw proximity rule. Different pipe sizes, flaw aspect ratios, and ligament distances from subsurface flaws to inner surface of pipes were taken into account. The results indicate the current proximity rule gives less conservative fatigue lives, when the aspect ratios of the subsurface flaws are small.

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References

Hasegawa, K. , Li, Y. , Miyazaki, K. , and Saito, K. , 2013, “ Fatigue Crack Growth for Subsurface Flaws Near Component Surface and Proximity Rules,” ASME Paper No. PVP2013-97559.
Hasegawa, K. , Li, Y. , Miyazaki, K. , and Saito, K. , 2012, “ Comparison of Experiment and Calculation on Fatigue Crack Growth for Transformed Surface Flaw,” ASME Paper No. PVP2012-78688.
Hasegawa, K. , Li, Y. , Lacroix, V. , and Strnadel, B. , 2015, “ Re-Characterization of Subsurface Flaw to Surface Flaw Based on Equivalent Fatigue Crack Growth Rate,” ASME Paper No. PVP2015-45946.
Lacroix, V. , Li, Y. , Strnadel, B. , and Hasegawa, K. , 2015, “ Re-Characterization of Subsurface Flaw to Surface Flaw Based on Equivalent Fatigue Crack Growth Rate,” ASME J. Pressure Vessel Technol., 138(2), p. 024701. [CrossRef]
ASME Boiler & Pressure Vessel Code Section XI, 2013, Rules for Inservice Inspection of Nuclear Power Plant Components, American Society of Mechanical Engineers, New York.
JSME S NA1, 2004, Rules on Fitness-for-Service for Nuclear Power Plants, The Japan Society of Mechanical Engineers, Tokyo (in Japanese).
SSM, 2008, A Combined Deterministic and Probabilistic Procedure for Safety Assessment of Components With Cracks Handbook, Swedish Radiation Safety Authority, Stockholm, Sweden.
RCC-MR, 2002, Design and Construction Rules for Mechanical Components of FBR Nuclear Island: A16.200 (Defect Used in the Analysis), AFCEN, Paris.
Miyazaki, K. , Iwamatus, F. , Nakanishi, S. , and Shiratori, M. , 2006, “ Stress Intensity Factor Solution for Subsurface Flaw Estimated by Influence Function Method,” ASME Paper No. PVP2006-ICPVT-11-93138.
Hasegawa, K. , and Li, Y. , 2015, “ Development of Stress Intensity Factors for Deep Surface Cracks in Pipes and Plates,” ASME Paper No. PVP2015-45048.

Figures

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Fig. 1

Transformation from subsurface to surface flaw during fatigue crack growth

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Fig. 2

Proximity factor Y determined from experiment [4]

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Fig. 3

Fatigue crack growth in the thickness direction for a0/ℓ0 = 0.03 at S0 = 1.5 mm and t = 17.4 mm

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Fig. 4

Fatigue crack growth in the thickness direction for a0/ℓ0 = 0.03 at S0 = 2.0 mm and t = 17.4 mm

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Fig. 5

Fatigue crack growth in the thickness direction for a0/ℓ0 = 0.03 at S0 = 3.0 mm and t = 17.4 mm

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Fig. 6

Fatigue crack growth in the thickness direction for a0/ℓ0 = 0.5 at S0 = 3.0 mm and t = 17.4 mm

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Fig. 7

Fatigue crack growth in the thickness direction for a0/ℓ0 = 0.03 at S0 = 2.0 mm and t = 11.0 mm

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Fig. 8

Fatigue crack growth in the thickness direction for a0/ℓ0 = 0.5 at S0 = 2.0 mm and t = 11.0 mm

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Fig. 9

Ratio of remaining lives based on the current code and proposed new proximity factor for t = 17.4 mm

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Fig. 10

Ratio of remaining lives based on the current code and proposed new proximity factor for t = 11.0 mm

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