| Project/Area Number |
05452124
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | YOKOHAMA NATIONAL UNIVERSITY |
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Principal Investigator |
SHIRATORI Masaki YOKOHAMA NATIONAL UNIVERSITY DEPARTMENT OF MECHANICAL ENGINEERING AND MATERIALS SCIENCE,PROFESSOR, 工学部, 教授 (60017986)
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| Co-Investigator(Kenkyū-buntansha) |
YU Qiang YOKOHAMA NATIONAL UNIVERSITY DEPARTMENT OF MECHANICAL ENGINEERING AND MATERIALS, 工学部, 講師 (80242379)
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| Project Period (FY) |
1993 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥6,200,000 (Direct Cost: ¥6,200,000)
Fiscal Year 1994: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1993: ¥5,300,000 (Direct Cost: ¥5,300,000)
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| Keywords | Infrared Thermography / Nondestructive Inspection / Detection of flaws / Image Processing / Fatigue Crack / Honeycomb Sandwich |
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| Research Abstract |
In this research project, the following results have been gotten :
(1) Due to a detection of cracks embedded in the structural members, various methods for heating or cooling the specimen have been examined. Heating by high-frequency eddy current is the best suited method.
(2) More than 2.0mm fatigue cracks can be detected by an infrared thermography with a magnifying glass.
(3) An image-processing expert system has been developed to obtain definite images of the cracks.
(4) Due to a detection of flaws in honeycomb sandwich constructions, various methods for heating or cooling the specimen have been examined. Heating by a silicone rubber heater with a heat accumulator is the best suited method.
(5) It has been confirmed that this method is useful to detect of various flaws in honeycomb sandwich constructions which can be caused in the respective manufacturing process.
(6) Flaws of which sizes are larger than the honeycomb core size can be detected.
(7) The developed image-processing method reveals the honeycomb structure and unclear flaws.
(8) A three-dimensional finite element method program has been developed to carry out the heat conduction for the detection of flaws in a structural wall.
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