| Project/Area Number |
60850019
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
材料力学
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| Research Institution | University of Tokyo |
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Principal Investigator |
OKAMURA Hiroyjki University of Tokyo, Faculty of Engineering, 工学部, 教授 (00010679)
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| Co-Investigator(Kenkyū-buntansha) |
SAKAI Shinsuke University of Tokyo, Faculty of Engineering, 工学部, 助教授 (80134469)
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| Project Period (FY) |
1985 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥9,200,000 (Direct Cost: ¥9,200,000)
Fiscal Year 1986: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1985: ¥8,500,000 (Direct Cost: ¥8,500,000)
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| Keywords | Image processing / SEM / Fractography / Micro-computer / On-line processing / 立体構造解析 / 破面解析 / 対話型処理 |
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| Research Abstract |
1.Development of computer system for image processing;By using personal computer which has 16-bit micro-processor 80286, high resolution TV camera and image frame memory, we developped a image processing system for the analysis of SEM picture. We can digitize the SEM picture by two ways;one is the method using camera film and the other is the one takeing picture directly from SEM. Basic software routines for image processing, such as image restoration, texture analysis and filtering were developped by using C-language.
2.Development of algorithm for stereoscopic structural analysis by using multi-directional observation;Normal stereoscopic analysis, which uses only two directional pictures, can not analyse the deeply concaved structure because the bottom area of such region can not observed after the rotation of specimen. In order to solve this problem, we developed a new algorithm, which uses multi-directional observation method. In this algorithm plural pictures which are observed from different direction are used for the analysis. Fracture surface of fatigue and stretched zone were analysed by the method and satisfactory results were obtained.
3.Development of stereoscopic structural analysis by using on-line method;We developped a system to analyse fine structure of fracture surface in on-line real time procedure. We modified normal SSDA method, and can become to analyse stereoscopic sturcture faster than before. Pointing out arbitral line on the picture, the sectional shape on the line is analysed immediately and the result is superposed on the monitor.
4.Detection of defects around welded zone;Developped new algorithm shown in 3. was applied for the detection of the defects around welded points. We confirmed that the method is effective to detect the under-cutted point automatically. Therefore it is expected that the method is applicable for the non-destructive inspection for the welded structure.
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