1993 Fiscal Year Final Research Report Summary
Evaluation of the Local Fracture Toughness of Toughened Ceramic Composites Based on In-situ Observation of Microscoic Crack Extension
| Project/Area Number |
04650694
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
無機工業化学・無機材料工学
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
YASUDA Kouichi Tokyo Institute of Technology, Faculty of Engineering, Research Associate, 工学部, 助手 (20191306)
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| Co-Investigator(Kenkyū-buntansha) |
TANABE Yasuhiro Tokyo Institute of Technology, Research Laboratory of Engineering Materials, Ass, 工業材料研究所, 助教授 (70163607)
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| Project Period (FY) |
1992 – 1993
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| Keywords | Ceramic Composites / Crack Extension / Fracture Toughness / In-situ Observation |
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| Research Abstract |
The influence of elastic msmatch or thermal expansion mismatch between dispersed particle and matrix on fracture toughness of toughened ceramic composites was formulated by the equivalent inclusion method.
This theory was verified with experimental results of particle-dispersed polycrystalline mullite. Microscopic crack extension in polycrystalline alumina was in-situ observed with secondary electron microscope equipped with bending test fixture. It indicated that the microscopic crack extenson was explained with markov process. Byconsidering the relation-ship between fracture toughness and fraction of transgranular fracture, the local fracture toughnesses ( fracture toughness for transgranular fracture and that for intergranular fracture ) of particle-dispersed polycrystalline magnesia were quantitatively evaluated.
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