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Journal Articles

Introduction of subsurface proximity criteria in the world and stress intensity factors for transformed surface flaws

Hasegawa, Kunio; Li, Y.; Katsumata, Genshichiro*; Dulieu, P.*; Lacroix, V.*

Proceedings of 2017 ASME Pressure Vessels and Piping Conference (PVP 2017) (CD-ROM), 6 Pages, 2017/07

Net-section stress at the ligament between component free surface and subsurface flaw increases when the ligament distance is short. It can be easily expected that stress intensity factors increase when the subsurface flaw locates near the free surface. To avoid catastrophic failures caused by ligament failure, fitness-for-service (FFS) codes provide flaw-to-surface proximity rules. The proximity rules are used to determine whether the flaws should be treated as subsurface flaws as-is, or transformed to surface flaws. The stress intensity factor for the transformed surface flaw increases furthermore. The increment of the stress intensity factor before and after transformation depends on the location of the subsurface flaw. Although the concept of the proximity rules are the same, the specific criteria for the rules on transforming subsurface flaws to surface flaws differ amongst FFS codes. Particularly, the criteria are different amongst the same organizations of ASME (American Society of Mechanical Engineers). The proximity criteria of the FFS codes in the world were introduced in this paper. In addition, the stress intensity factors based on the different criteria used in the ASME Codes are compared.

Journal Articles

Proximity factor on transformation from subsurface to surface flaw

Hasegawa, Kunio*; Li, Y.; Serizawa, Ryosuke*; Kikuchi, Masanori*; Lacroix, V.*

Procedia Materials Science, 12, p.36 - 41, 2016/00

 Times Cited Count:0 Percentile:100

If subsurface flaws are detected that are close to component free surfaces, flaw-to-surface proximity rule is used to determine whether the flaws should be treated as subsurface flaws as is, or transformed to surface flaws. However, specific factors for the proximity rules on transforming subsurface to surface flaws differ among fitness-for-service codes. The objective of the paper is to reveal the proximity factor from the stress intensity factor interaction between the subsurface flaw and the free surface.

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.

Journal Articles

Detection of internal defect in materials by infrared thermography and its numerical simulation; Effect of thermal diffusivity of materials on defect detection

Ishii, Toshimitsu; Inagaki, Terumi*; Sakane, Taisuke*; Nakatani, Takahiko*; Ooka, Norikazu; Omi, Masao; Hoshiya, Taiji

Hihakai Kensa, 51(4), p.223 - 230, 2002/04

no abstracts in English

Journal Articles

Visualization of invisible internal defects using infrared thermography and numerical computation for the diagnostic standard

; Inagaki, Terumi*; *; Hoshiya, Taiji; Ooka, Norikazu

Proc. of Int. Conf. on Optical Technology and Image Processing in Fluid,Thermal and Combustion Flow, p.1 - 5, 1998/00

no abstracts in English

JAEA Reports

Radiographic Examination Techniques for Detecion of Internal Defects

JAERI-M 85-180, 51 Pages, 1985/12

JAERI-M-85-180.pdf:1.49MB

no abstracts in English

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