| Project/Area Number |
10650677
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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 |
Composite materials/Physical properties
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| Research Institution | Nagasaki University |
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Principal Investigator |
IWANAGA Hiroshi Faculty of Engineering, Nagasaki University, Professor, 工学部, 教授 (40039772)
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| Co-Investigator(Kenkyū-buntansha) |
MOTOJIMA Seiji Faculty of Engineering, Gifu Univ., Professor, 工学部, 教授 (80021608)
鈴木 邦夫 長崎大学, 工学部, 助教授 (50107439)
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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 |
¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2000: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1999: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1998: ¥2,600,000 (Direct Cost: ¥2,600,000)
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| Keywords | Combined Stress / Carbon Fiber / Tensile Strength / Mechanical Proterty / 引張り強度 / アルミナファイバー / ねじれ強度 / 熱処理 / アモルファス / 微結晶 |
|---|
| Research Abstract |
Fracture strength of commercial carbon fibers was measured under combined torsion-tension deformation, where a carbon fiber was stretched after twisting many turns around the fiber axis. The tensile fracture strength decreased drastically with increasing number of turns, exhibiting inclined fracture surface. The results of a low modulus pitch-based carbon fiber (XN-05 from Nippon Graphite Fiber Co.) agree quite well with the theoretical relation derived on the assumption that the fracture occurs when the local tensile stress reached a critical stress. This fact is consistent with the fact that the fiber has an almost isotropic amorphous-like structure. The results for a high PAN-based carbon fiber (M60J from Nippon Carbon Co.) consisting of anisotropic graphite layers show a deviation from the theoritical curve indicating an anisotropic strength of the fiber.
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