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research-article

Development of stress intensity factors for subsurface flaws in plates subjected to polynomial stress distributions

[+] Author and Article Information
Kai Lu

Nuclear Safety Research Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan
lu.kai@jaea.go.jp

Mano Akihiro

Nuclear Safety Research Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan
mano.akihiro@jaea.go.jp

Jinya Katsuyama

Nuclear Safety Research Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan
katsuyama.jinya@jaea.go.jp

Yinsheng Li

Nuclear Safety Research Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan
li.yinsheng@jaea.go.jp

Fuminori Iwamatsu

Research & Development Group, Hitachi, Ltd. 7-1-1 Omikacho, Hitachi, Ibaraki 319-1292, Japan
fuminori.iwamatsu.vt@hitachi.com

1Corresponding author.

ASME doi:10.1115/1.4039125 History: Received May 22, 2017; Revised December 17, 2017

Abstract

The stress intensity factor (SIF) solutions for subsurface flaws near the free surfaces of components, which are known to be important in engineering applications, have not been provided yet. Thus, in this paper, SIF solutions for subsurface flaws near the free surfaces in flat plates were numerically investigated based on finite element analyses. The flaws with aspect ratios a/l = 0.0, 0.1, 0.2, 0.3, 0.4 and 0.5, the normalized ratios a/d = 0.0, 0.1, 0.2, 0.4, 0.6 and 0.8, and d/t = 0.01 and 0.10 were taken into account, where a is the half flaw depth, l is the flaw length, d is the distance from the center of the subsurface flaw to the nearest free surface and t is the wall thickness. Fourth-order polynomial stress distribution in the thickness direction was considered. In addition, the developed SIF solutions were incorporated into a Japanese probabilistic fracture mechanics (PFM) code, and PFM analyses were performed for a Japanese reactor pressure vessel containing a subsurface flaw near the inner surface. The PFM analysis results indicate that the obtained SIF solutions are effective in engineering applications.

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