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Journal Articles

Material deterioration diagnosis of austenite stainless steel by measurement of leakage magnetic flux density

Takaya, Shigeru; Nemoto, Yoshiyuki; Uchimoto, Tetsuya*; Keyakida, Satoshi*

Nihon AEM Gakkai-Shi, 17(1), p.156 - 161, 2009/03

In a previous study, authors showed experimentally the correlation between leakage magnetic flux density and irradiation assisted stress corrosion cracking susceptibility of high purity model austenitic stainless steels. This study aimed to investigate mechanism of the correlation. Tensile test at elevated temperature and aging test were conducted on materials simulating irradiation-induced segregation, and leakage magnetic flux density was measured before and after these tests in order to study the influence of chemical composition change and lattice defect to leakage magnetic flux density. Furthermore, dependency of magnetic moment on chemical composition and vacancy was evaluated by first principle calculation. As result, it was shown that leakage magnetic flux density of irradiated materials is thought to increase in severe irradiation-induced segregation region with and without vacancy.

Journal Articles

ITER and topics on electro-magnetics in fusion machine design

Nakahira, Masataka

Nihon AEM Gakkai-Shi, 14(2), p.203 - 208, 2006/06

These commentary provides outline of ITER project, ITER Vacuum Vessel design and topics of electro-magnetic design. The author has joined ITER project for over 10 years and been involved in the Vacuum Vessel design and technical development. Based on the experience, the author tries to express topical issues about structural design and assessment of electro-magnetic load from the view point of systematization. Therefore, characteristics of the electro-magnetic load, difference from pressure, and issues on application of existing design method are clarified comparing with pressure vessel design.

Journal Articles

Evaluation of corrosion behavior of ion irradiated stainless steel using atomic force microscope

Nemoto, Yoshiyuki; Miwa, Yukio; Tsuji, Hirokazu; Tsukada, Takashi

Nihon AEM Gakkai-Shi, 11(4), p.242 - 248, 2003/12

no abstracts in English

Journal Articles

Development of a RIMS-based FFDL system at the experimental fast reactor JOYO

Harano, Hideki; Ito, Chikara

Nihon AEM Gakkai-Shi, 14(1-4), 307 Pages, 2003/00

None

Journal Articles

Aging degradation of light water reactor materials; Reactor internal and pressure vessel materials

Tsukada, Takashi; Ebine, Noriya

Nihon AEM Gakkai-Shi, 9(2), p.171 - 177, 2001/06

no abstracts in English

Journal Articles

Reconstruction of magnetic charges using an optimization method and waveled

Chen, Z.; ;

Nihon AEM Gakkai-Shi, 8(3), 77-85 Pages, 2000/09

As a part efforts to establish a passive nondestructive testing method using leakage magnetic field,the magnetic charges caused by mechanical damages are reconstructed in this paper from measured leakage field date with use of methods in deterministic category.Concerning the bad condition number of this typical ill-posed inverse problem,an optimization approach is adopted for solving the unknown magnetic parameters in which the designation of initial profiles,weight coefficients and total number of iterations were taken as means of regularization.Moreover,for improving robustness against noise, a Galerkin procedure with base function chosen as the Daubiches'wavelet isalso introduced for discretizing the governing equations.Reconstruction with the proposed methods is practically practically

Journal Articles

Estimation method for inverse problem in advanced technology

; Ara, Katsuyuki

Nihon AEM Gakkai-Shi, 3(2,3), p.1 - 7, 1995/00

no abstracts in English

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