| Project/Area Number |
07555030
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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 | 試験 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
OHTANI Ryuichi Kyoto Univ., Eng., Professor, 工学研究科, 教授 (50025946)
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| Co-Investigator(Kenkyū-buntansha) |
TADA Naoya Kyoto Univ., Eng., Instructor, 工学研究科, 助手 (70243053)
KITAMURA Takayuki Kyoto Univ., Eng., Associate Professor, 工学研究科, 助教授 (20169882)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥13,100,000 (Direct Cost: ¥13,100,000)
Fiscal Year 1996: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1995: ¥9,600,000 (Direct Cost: ¥9,600,000)
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| Keywords | Composite materials / Microcracking / Numerical simulation / Interface / Fiber / Matrix / 界面破壊 / 確率モデル / シミュレーション |
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| Research Abstract |
In order to evaluate the strength and toughness of composite materials, the following studies were carried out.
1.Tensile tests of unidirectionally-carbon-fiber-reinforced plastic using smooth specimens, and the observation of fracture process.
2.Stress analysis at the crack tip of Double Cantilever Beam specimen by means of Finite Element Method.
3.Atomic and probabilistic analyzes on microcroaking.
4.Numerical simulation of discrete fracture due to multiple microcracks.
In the first study, transverse tensile tests of unidirectionally-carbon-fiber-reinforced plastic were carried out using smooth specimens, and the multiple small cracks initiated at the interface of carbon fiber and matrix were observed by means of microscope. The fracture process was discussed based on the observation results.
In the second study, finite element analysis of the stress at the crack tip of Double Cantilever Beam specimen of unidirectionally-carbon-fiber-reinforced plastic was carried out. The effect of fibers on the stress distribution was examined and the applicability of conventional fracture mechanics to the composite material was discussed.
In the third study, atomic and probabilistic analyzes on the microcrack were carrid out. The definition of microcrack was clarified and a method for determination of the distribution of internal microcracks from their cross-sectional distribution was proposed.
In the last study, numerical simulation of the initiation and propagation of microcracks was carried out. The discrete fracture by microcracking was successfully simulated.
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