| Project/Area Number |
11555175
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Structural/Functional materials
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
OCHIAI Shojiro Graduate School of Engineering, Kyoto University, Professor, 工学研究科, 教授 (30111925)
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| Co-Investigator(Kenkyū-buntansha) |
HOJO Masaki Graduate School of Engineering, Kyoto University, Professor, 工学研究科, 教授 (70252492)
ISHIKAWA Toshihiro Ube Industries, Ltd, Head Researcher, 宇部研究所, 主席研究員
石川 敏広 宇部興産(株), 宇部研究所, 主席研究員
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| Project Period (FY) |
1999 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥13,200,000 (Direct Cost: ¥13,200,000)
Fiscal Year 2001: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2000: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1999: ¥9,900,000 (Direct Cost: ¥9,900,000)
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| Keywords | Composite / Strengthening and toughening / Strength / Damage / Control of interface / Longitudinal cracking / Notch setisitivity / Energy release rate / 高靱化 / 破壊 / 界面剥離 / 多重破断 / 応力伝達 / 金属間化合物 / セラミック / 繊維 / き裂 / 靭性 / 界面 |
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| Research Abstract |
Fiber-reniforced intermetallic and ceramic matrix composites are expected as the high temperature materials for next generation. The strength and toughness are, however, not sufficient for application. Further strengthening and toughening, and improvement of reliability are required for practical use. The aim of the present workwas to achieve high strength and toughness by introducing crack arrest mechanisms.
Main results are summarized as follows.
(1) Newmodelwas developed fordescriptionofmicro-damageaccumulationprocess and its influenceonoverall stress-straincurve, strengthand fracturemorphology. With thismethod, indications formaterial design to achieve high strength and toughness could be obtained.
(2) Influences of residual stresses, sample size and loading condition on longitudinal cracking were clarified experimentally and theoretically, which supplied useful indications for toughening.
(3) Influences of inter facial condition on unnotched and notched strengths were clarified experimentally, from which the necessary condition for crack-arrest was obtained.
(4) In the Si-Ti-C-0/BMAS composite with heat-resistant crystallized glass matrix, the formation of carbon layer at interface was found to act to cause longitudinal cracking, which leads to blunting of the notch-tip. The critical energy release rate of longitudinal crackingwas first estimated to be around 100J/m2.
(5) To aim toughening by inter facial control and introduction of ductile metal, C/C-Mg composite was prepared, which showed high Young's modulus, high strength and low notch-sensitivity.
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