| Project/Area Number |
14550717
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Material processing/treatments
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| Research Institution | Oita National College of Technology |
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Principal Investigator |
TESHIMA Norihiro Oita National College of Technology, Department of Computer and Control Engineering, Assistant, 制御情報工学科, 助手 (40259974)
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| Co-Investigator(Kenkyū-buntansha) |
UMEZU Seiji Oita National College of Technology, Department of Mechanical Engineering, Professor, 機械工学科, 教授 (50044508)
ISHIDA Mizuho Oita National College of Technology, Department of Mechanical Engineering, Professor, 機械工学科, 教授 (70044500)
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| Project Period (FY) |
2002 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2003: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2002: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | Caustic method / Interference effects / Stress intensity factor / Optical constant / Inside cracks / Photoelastic method / Epoxy resin |
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| Research Abstract |
In this study, the stress intensity factors of the two dimensional specimens with an inside crack or plural-inside cracks were experimentally investigated in the case of applying thermal loads in the vicinity of the crack or cracks. A single inside crack being standardized, the stress intensity factor of the center crack of the three or five plural inside cracks was compared with the result from a single inside crack. In the thermal loading experiments, a single inside and plural inside cracks on the specimen were temporarily and rapidly contacted with 100℃ heat source and the results from a single crack and plural cracks (three or five) were experimentally obtained. The influence by the crack interval and the distance from the specimen edge was examined. Furthermore, in case of inside plural cracks, the mutual interference among the cracks was compared with those from a single inside crack. Consequently, the relaxation effect of the stress intensity factors by thermal loading was quantitatively clarified. Also, in case of showing increasing tendency, the result was obtained in the similar way. As a result, the validity of caustic method was confirmed, even in case of the patterns showing rapid change.
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