NEW EVALUATION METHODS FOR MICRO-R-CURVE OF ADVANCED CERAMIC COMPOSITES

先进陶瓷复合材料微R曲线评价新方法

• 批准号: 07650795
• 负责人: YASUKA Kouichi
• 金额: $ 1.09万
• 依托单位: TOKYO INSTITUTE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650795/
• 关键词: CERAMIC COMPOSITES; FRACTURE TOUGHNESS; MICRO-R-CURVE; NEW EVALUATION METHOD; 破壊靱性; セラミック複合材料

A new evaluation method for micro-R-curve of advanced ceramic composites was proposed based on controlled surface flaw method (CSF method). A fracture mechanical model was developed to theoretically discuss the influence of interaction force between crack faces, residual stress around a Vickers indent, initial crack length and shape of a surface crack on micro-R-curveby CSF method. This model was verified with experimental results of glass, polycrystalline alumna, polycrystalline silicon nitride and tetragonal zirconia polycrystals. In case of polycrystalline silicon nitride, a rising micro-R-curve was measured and a bridging stress betwen crack faces was also estimated. In case of tetragonal zirconia polycrystals, micro-r-curve was not measured because residual stress was not eliminated by polishing larger than three times depth of the Vickersindent. We conclude that the new evaluation method can provide micro-R-curve for the materials that residual stress around a Vickers indent can be eliminated by polishind larger than three times depth of the indent.

提出了一种基于受控表面缺陷法（CSF法）的先进陶瓷复合材料微观R曲线评价方法。建立了断裂力学模型，从理论上讨论了裂纹面间相互作用力、Vickers裂纹周围残余应力、初始裂纹长度和表面裂纹形状对CSF法微R曲线的影响。用玻璃、多晶氧化铝、多晶氮化硅和四氧化锆多晶的实验结果验证了该模型的正确性。在多晶氮化硅的情况下，一个上升的微观R曲线被测量，并估计裂纹面之间的桥接应力。在四氧化锆多晶体的情况下，没有测量微r曲线，因为通过抛光大于Vickersindent的三倍深度不能消除残余应力。结果表明，该方法可以为3倍于维氏硬度的抛光深度消除残余应力的材料提供微观R曲线。

项目成果

田口富嗣: "多結晶Si_3N_4におけるmicro-R-curveの新評価法" 第1回材料科学若手研究者討論会講演予稿集,日本材料科学会. 45-48 (1994)

Tomitsugu Taguchi：“多晶 Si_3N_4 中微 R 曲线的新评估方法”第一届材料科学青年学者论坛论文集，日本材料学会 45-48 (1994)。

安田公一: "DSF法を用いたマイクローRーカーブの新評価法" 第8回秋季シンポジウム講演予稿集,日本セラミックス協会. 248-248 (1995)

Koichi Yasuda：“使用 DSF 方法的微 R 曲线的新评估方法”第 8 届秋季研讨会论文集，日本陶瓷协会 248-248（1995）。

Takashi AKATSU: "The R-curve Behavior of Vickers Indentation Cracks in a SiC-whisker Reinforced Alumina" The Report of the Research Laboratory of Engineering Materials. No.21. 55-61 (1995)

Takashi AKATSU：“SiC 晶须增强氧化铝中维氏压痕裂纹的 R 曲线行为”工程材料研究实验室的报告。

多々見純一: "多結晶アルミナの破壊靭性に及ぼすき裂進展経路の影響" 東京工業大学博士論文(工学)自費出版, 282 (1997)

榻榻米纯一：《裂纹扩展路径对多晶氧化铝断裂韧性的影响》东京工业大学博士论文（工学）自出版，282（1997）

Kouichi YASUDA: "Influence of Crack Path on the Fracture Toughness of Polycrystalline Al_2O_3" Fracture Mechanics of Ceramics. vol.11. 315-330 (1996)

Kouichi YASUDA：“裂纹路径对多晶 Al_2O_3 断裂韧性的影响”陶瓷断裂力学。