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Wakai, Takashi; Machida, Hideo*; Sato, Kenichiro*
Nihon Kikai Gakkai M&M 2015 Zairyo Rikigaku Kanfarensu Koen Rombunshu (Internet), 3 Pages, 2015/11
This paper describes a through-wall crack length evaluation procedure applicable to Leak Before Break (LBB) assessment of Japan Sodium cooled Fast Reactor (JSFR) pipes made of Mod.9Cr-1Mo steel. In LBB assessment of JSFR pipes, it is required to calculate virtual through-wall crack length, though the crack growth is quite small under design condition. Generally, it is known that the through-wall crack length depends on loading condition, namely the load ratio between tensile and bending and that the length under pure bending load condition is largest. This study proposes a simplified method to evaluate the through-wall crack length both for axial and circumferential cracks as a function of load ratio and fatigue crack growth characteristics. Using the method, through-wall crack length can be predicted as far as we know the loading condition and material properties.
Lu, K.; Katsuyama, Jinya; Li, Y.
Nihon Kikai Gakkai M&M 2015 Zairyo Rikigaku Kanfarensu Koen Rombunshu (Internet), 3 Pages, 2015/11
In this paper, the stress intensity factor (SIF) solutions for subsurface elliptical cracks near the free surface in flat plates were numerically investigated based on finite element analyses. The cracks with aspect ratios 
= 0, 0.1, 0.2, 0.3, 0.4 and 0.5, normalized ratios 
= 0, 0.1, 0.2, 0.4, 0.6 and 0.8 and 
= 0.1 were taken into account, where a is the crack half-depth, 
is the crack length, 
is the distance from subsurface crack to the nearest free surface and 
is the wall thickness. Fourth-order polynomial stress distributions in the thickness direction were considered. It was concluded that the numerical SIF solutions presented in the paper are useful in engineering applications.
Li, Y.
Nihon Kikai Gakkai M&M 2015 Zairyo Rikigaku Kanfarensu Koen Rombunshu (Internet), 2 Pages, 2015/11
no abstracts in English
Tanaka, Masaaki; Miyake, Yasuhiro*
Nihon Kikai Gakkai M&M 2015 Zairyo Rikigaku Kanfarensu Koen Rombunshu (Internet), 3 Pages, 2015/11
A prototype coupling method consisting of the fluid-structure thermal interaction simulation code MUGTHES and the structural thermal stress analysis code FINAS with interface program MUFIN has been developed in order to estimate the thermal fatigue in the SFRs. As a fundamental validation of the coupled method, it was applied to the water experiment for thermal mixing phenomena in a T-junction piping system. In the experiment, thermal interaction between the fluid and the structure made of aluminum installed to the branch pipe side wall was considered. Through the numerical simulations, applicability of the coupled method was confirmed.
