弾性的スロークラックグロース領域におけるSi<sub>3</sub>N<sub>4</sub>の高温遅れ破壊に及ぼす上昇型<i>R</i>曲線挙動の効果
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- PEZZOTTI Giuseppe
- Department of Materials Science, Toyohashi University of Technology
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- 大田 健一
- 大阪大学産業科学研究所
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- 西田 俊彦
- 京都工芸繊維大学工芸学部物質工学科
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- 逆井 基次
- 豊橋技術科学大学工学部
書誌事項
- タイトル別名
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- Effect of Rising <i>R</i>-Curve Behavior on the High-Temperature Delayed-Failure Resistance of Si<sub>3</sub>N<sub>4</sub> Ceramics under Elastic Slow-Crack-Growth Regime
- Effect of Rising R-Curve Behavior on th
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The effect of a rising R-curve behavior on the high-temperature lifetime and flaw-tolerance of Si3N4 ceramics has been systematically investigated. Extensive mechanical testing was pursued at 1400°C, typical temperature at which the selected materials fractured under the elastic slow-crack-growth (SCG) regime (i.e., with negligible plastic strain). Hot-isostatically pressed (HIP) Si3N4, its WC-platelet, SiC-platelet and SiC particulate composites were selected for this basic investigation. All the composites investigated contained the same volume fraction (i.e., 25%) of reinforcing phase and were fully dense after the HIP process without external addition of densification agents. This latter important processing circumstance has made available materials which, besides having the same grain-boundary structure and, hence, the same intrinsic thermo-mechanical response of the grain boundaries at high temperature, showed different R-curve behaviors. It was systematically found that the rising R-curve, especially pronounced in composites reinforced with high-aspect-ratio platelets, provided a positive effect on lifetime and flaw-tolerance. From the theoretical side, both the lifetime elongation and the improved flaw-tolerance were well explained by an algorithm incorporating into the mechanical driving force acting on the crack tip, the closure-field contribution due to the rising R-curve behavior of the material.
収録刊行物
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- Journal of the Ceramic Society of Japan (日本セラミックス協会学術論文誌)
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Journal of the Ceramic Society of Japan (日本セラミックス協会学術論文誌) 104 (1206), 89-93, 1996
公益社団法人 日本セラミックス協会
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詳細情報 詳細情報について
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- CRID
- 1390001205278859392
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- NII論文ID
- 110002291317
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- NII書誌ID
- AN10040326
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- ISSN
- 18821022
- 09145400
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- NDL書誌ID
- 3926670
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- データソース種別
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- JaLC
- NDL
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