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Research Papers: Design and Analysis

Stress Intensity Factors for Transformed Surface Flaws and Remaining Fatigue Lives Based on Flaw-to-Surface Proximity Rules

[+] Author and Article Information
Kunio Hasegawa, Bohumir Strnadel

Center of Advanced Innovation Technologies,
VSB-Technical University of Ostrava,
17. Listopadu 15/2172,
Ostrava-Poruba 708 33, Czech Republic

Yinsheng Li

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

Valery Lacroix

Tractebel (ENGIE),
Bd. Simon Bolivar 34-36,
Brussels B-1000, Belgium

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received January 16, 2018; final manuscript received June 13, 2018; published online August 2, 2018. Assoc. Editor: Yun-Jae Kim.

J. Pressure Vessel Technol 140(5), 051204 (Aug 02, 2018) (7 pages) Paper No: PVT-18-1016; doi: 10.1115/1.4040640 History: Received January 16, 2018; Revised June 13, 2018

Subsurface flaws are sometimes found as blowholes near free surfaces of structural components. Net-section stress at the ligament between the free component surface and the subsurface flaw increases when the ligament size is short. It can be easily expected that the stress intensity factor at the tip of the subsurface flaw increases with decreasing the ligament size. Fitness-for-service (FFS) codes provide flaw-to-surface proximity rules, which are transformation from subsurface to surface flaw. Although the concepts of the proximity rules of the FFS codes are the same, the specific criteria for the rules on transforming subsurface flaws to surface flaws are significantly different among FFS codes. This study demonstrates the proximity criteria provided by the FFS codes and indicates that the increment of the stress intensity factors before and after the transformation depends on the flaw aspect ratio and the ligament size at the transformation from subsurface to surface flaws. In addition, it is shown that remaining fatigue lives for pipes with flaws are strongly affected by the ligament size at the transformation from subsurface to surface flaws.

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Figures

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Fig. 1

Transformation of subsurface to surface flaw

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Fig. 2

Stress intensity factor interaction for subsurface flaw [4]

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Fig. 3

Stress intensity factors before and after transformation

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Fig. 4

Increase ratio of stress intensity factors at transformation

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Fig. 5

Fatigue crack growth in the thickness direction (2a = 5.22 mm, S = 2 mm)

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Fig. 6

Fatigue crack growth in the thickness direction (2a = 5.22 mm, S = 3 mm)

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Fig. 7

Fatigue crack growth in the thickness direction (2a = 5.22 mm, S = 4 mm)

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