| Project/Area Number |
10305010
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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 | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
OTHANI Ryuichi Kyoto University, Department of Engineering Physics and Mechanics, Professor, 工学研究科, 教授 (50025946)
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| Co-Investigator(Kenkyū-buntansha) |
TADA Naoya Okayama University, Department of Mechanical Engineering, Associate Professor, 工学部, 助教授 (70243053)
KITAMURA Takayuki Kyoto University, Department of Engineering Physics and Mechanics, Professor, 工学研究科, 教授 (20169882)
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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥40,400,000 (Direct Cost: ¥40,400,000)
Fiscal Year 2000: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1999: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1998: ¥36,500,000 (Direct Cost: ¥36,500,000)
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| Keywords | Scanning Probe Microscope / Apparatus for Measuring Submicroscopic Current Distribution / Electric Field Analysis / Small Defect / Small Crack / 微小はく離 |
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| Research Abstract |
1. Electric field analysis for predicting the distribution of multiple cracks by means of direct current electrical potential method
Crack-current modification method was proposed for analyzing the electric field around multiple cracks. Electric field analysis was carried out for randomly distributed disk-shaped cracks in a three-dimensional conductor and for distributed through-cracks in a two-dimensional one. Based on the results of the analysis, a procedure was proposed for predicting the distribution of multiple cracks by direct current electrical potential method.
2. Evaluation of a small defect existing right under the surface of conductive materials
A small defect existing right under the surface of the conductive material was evaluated by means of a scanning probe microscone with current measuring system where electric current was supplied through a cantilever to the conductor and the defect was evaluated by the change in the current. Electric analysis was carried out for discussing the basis of this apparatus by the crack-current modification method which was used for the electric field analysis around multiple cracks. It was clarified by actual current measurement that contact condition or contact electric resistance between the cantilever and the specimen has a great influence on the amount of current. In order to find the best measuring condition, electric analysis was carried out simulating the apparatus in which the contact area was fluctuated intentionally. The following results were obtained. Modification of the shape of a cantilever tip is necessary. Further development is needed on the servomechanism of cantilever.
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