| Project/Area Number |
07555616
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
SHOJI Tetsuo TOHOKU UNIVERSITY,Faculty of Engineering, Professor, 工学部, 教授 (80091700)
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| Co-Investigator(Kenkyū-buntansha) |
TAMAKAWA Kinji TOHOKU UNIVERSITY,Faculty of Engineering, Research Associate, 工学部, 助手 (30005368)
NAKAJIMA Mikiko TOHOKU UNIVERSITY,Graduate School of Engineering, Lecturer, 大学院・工学研究科, 講師 (80005488)
WATANABE Yutaka TOHOKU UNIVERSITY,Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (10260415)
SAKA Masumi TOHOKU UNIVERSITY,Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (20158918)
伊達 和博 東北大学, 工学部, 教授 (10111254)
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| Project Period (FY) |
1995 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥7,300,000 (Direct Cost: ¥7,300,000)
Fiscal Year 1997: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1996: ¥5,400,000 (Direct Cost: ¥5,400,000)
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| Keywords | nondestructive inspection / remaining life evaluation / materials degradation / defect / fatigue / creep damage / embrittlement / genetic algorithm / 遺伝的アルゴリズム / 非破壊検査 / 寿命予測 / 損傷 / 超音波探傷 / 交流電位差法 / 電気化学 / 経年劣化 |
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| Research Abstract |
Degradation mechanisms which can take place in aged energy plant components are widely varied depending on material of the component, service environment, and operating conditions. For plant life management and extension, prediction of remaining lives of the plants which is based on detection and quantitative evaluation of in-service degradation of the components.
(1) development of nondestructive inspection methods for various types of degradation which are respectively based on the degradation mechanisms, and (2) development of a prototype system which can specify the dominant deterioration factors for a aged plant components under given operation conditions, have been in the scope of this research project.
For defect-type degradation, Induced Current Focused Potential Drop method has been successfully applied to determine shape and size of three dimensionally shaped surface cracks. For material-type degradation, Electrochemical Materials Characterization methods have been developed for the following degradations which no nondestructive inspection methods have been available for ; creep damage in directionally solidified Ni-base super alloy for gas turbine applications, creep damage in W-modified heat-resistant ferritic steels, high-temperature low-cycle fatigue damage in Ni-base superalloys, thermally aging embrittlement of duplex stainless cast, and aging embrittlement of type 310S stainless steel.
With respect to the life evaluation system, genetic algorithm has been introduced to develop the prototype system which supports identifying dominant factors for in-service degradation and helps to predict remaining lives of components. The system has been successfully applied to corrosion damage evaluation of heat-exchanger tubes of chemical plants.
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