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Ichikawa, Yasuaki*; Choi, J. H.*; Tanno, Takeo; Hirano, Toru*; Matsui, Hiroya
JAEA-Research 2011-007, 91 Pages, 2011/06
JAEA-Research-2011-007.pdf:8.75MB
We first surveyed the classical theories of fracture mechanics, and discussed the subcritical crack growth (SCG), which is observed under less load than the fracture toughness Kc. This SCG is a result of coupled mechanical and chemical effect. The SCG for granite was treated on this basis. We performed pressure dissolution experiments using specimens of single crystal quartz, since the dissolution reaction is engaged with a deformation and failure process of polycrystalline rock. The series of experiments were managed by a flow-through type changing temperature, pH and applied stress. Si concentrations we here measured. We first surveyed the theories of pressure solution. Then we proposed a theory of saluting velocity of quart which accounts for the effects of temperature, chemical (pH), solid pressure and pore pressure.
Ichikawa, Yasuaki*; Choi, J. H.*; Hirano, Toru; Matsui, Hiroya
JAEA-Research 2009-027, 48 Pages, 2009/10
JAEA-Research-2009-027.pdf:3.75MB
On the radioactive waste disposal, the long-term mechanical stability of tunnel was required. Therefore, we have been developing the method evaluating the stability. This report describes the works in the FY2008. Chapter 1 is the overview. In Chapter 2 we performed pressure dissolution experiments using specimens of single crystal quartz, since the dissolution reaction is engaged with a deformation and failure process of polycrystalline rock. After applying stress the surface of contacted area of quartz was observed by microscope and found traces of dissolution and reprecipitation. We managed two types of experiment; a closed solution experiment and a flow-through experiment. We discussed the Si dissolution rate based on the experimental results measured by ICP-AES. Fundamental mechanism of time-dependent creep and stress relaxation for crystalline rocks was discussed in Chapter 3 based on a concept of mechano-chemical coupling phenomena (as treated in Chapter 2) at micro-crack tips.
Jeong, T.*; Choi, I. W.*; Sung, J. H.*; Kim, H.*; Hong, K.*; Yu, T.*; Kim, J.-H.*; Noh, Y.*; Ko, D.-K.*; Lee, J.*; et al.
Journal of the Korean Physical Society, 50(1), p.34 - 39, 2007/01
no abstracts in English
- and 
-alumina tube as the support tube in the Hi-H
O gaseous mixtureHwang, G.*; Kim, J.*; Choi, H.*; Onuki, Kaoru
Journal of Membrane Science, 215(1-2), p.293 - 302, 2003/04
Times Cited Count：16 Percentile：55.87(Engineering, Chemical)no abstracts in English
Orimo, Satoshi; Yogo, Akifumi; Ogura, Koichi; Sagisaka, Akito; Mori, Michiaki; Kiriyama, Hiromitsu; Kondo, Shuji; Yamamoto, Yoichi*; Shimomura, Takuya*; Tanoue, Manabu*; et al.
no journal, ,
We are investigating an intense fs-laser driven MeV proton source using a thin foil, and its applications. Simultaneous imaging of a sample with a proton and an X-ray beams has been demonstrated by a ultra-short pulse higt intensity Ti:Sapphire laser systems at JAEA and GIST. For generating a short-pulse proton beams and X-rays, an intense laser pulse irradiates a tape targets. The p-polarized laser pulse with 50 mm diameter is focused onto the cupper tape target at 45 degree incident angle with focal length of 238 mm (F/4.8), giving an intensity on target of 3-9
10
W/cm10
. The cupper and polyimide tape was 5, 7.5 micron in thickness and 20 mm in width. The target system supplies a fresh surface to the focus spot at every shot. We obtained simultaneously the projection image of a Ni mesh pattern having a periodically structured pattern by the proton detected CR39 and X-rays detected on imaging plate.
