Evaluation of the Local Fracture Toughness of Toughened Ceramic Composites Based on In-situ Observation of Microscoic Crack Extension

基于微观裂纹扩展原位观察的增韧陶瓷复合材料局部断裂韧性评价

• 批准号: 04650694
• 负责人: YASUDA Kouichi
• 金额: $ 1.22万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650694/
• 关键词: Ceramic Composites; Crack Extension; Fracture Toughness; In-situ Observation

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.

采用等效夹杂法阐述了分散颗粒与基体之间的弹性失配或热膨胀失配对增韧陶瓷复合材料断裂韧性的影响。该理论通过颗粒分散多晶莫来石的实验结果得到了验证。使用配备弯曲测试夹具的二次电子显微镜对多晶氧化铝中的微观裂纹扩展进行了原位观察。这表明微观裂纹扩展可用马尔可夫过程来解释。考虑断裂韧性与穿晶断裂分数之间的关系，定量评价了颗粒分散多晶氧化镁的局部断裂韧性（穿晶断裂韧性和沿晶断裂断裂韧性）。

项目成果

水流 靖彦,安田 公一,松尾 陽太郎,木村 脩七,安田 榮一: "HgO焼結体の破壊靭性に及ぼす粒径および第2相の影響(第2報:Fe_2O_3添加系)" 日本セラミックス協会学術論文誌. 101. 169-173 (1993)

Yasuhiko Mizuru、Koichi Yasuda、Yotaro Matsuo、Shushichi Kimura、Eiichi Yasuda：“晶粒尺寸和第二相对 HgO 烧结体断裂韧性的影响（第二报告：Fe_2O_3 添加剂体系）”日本陶瓷学会杂志 101 的学术论文。 169-173 (1993)

Kouichi YASUDA: "Influence of the crack path on the fracture toughness of polycrystalline MgO" The Third IUMRS International Conference on Advanced Materials. 6(印刷中). (1994)

Kouichi YASUDA：“裂纹路径对多晶 MgO 断裂韧性的影响”，第三届 IUMRS 国际先进材料会议（1994 年）。

Hirohisa ODA: "The Effect of Thermoelastic Properties of Inclusions on Fracture Toughness of Polycrystalline Mullite" Abstracts of 1993 Annual Meeting of the Japan Society for Composite Materials. 23-24 (1993)

Hirohisa ODA：“夹杂物的热弹性对多晶莫来石断裂韧性的影响”日本复合材料学会 1993 年年会摘要。

安田 公一: "等価介在物法による破壊靭性に及ぼす弾性不均一性及び残留熱応力効果の解析" Journal of the Ceramic Society of Japan. 100. 1332-1337 (1992)

Koichi Yasuda：“使用等效夹杂法分析弹性不均匀性和残余热应力对断裂韧性的影响”日本陶瓷学会杂志 100。1332-1337（1992）。

Kouichi YASUDA: "Influence of the Crack Path on the Fracture Toughness of Polycrystalline MgO" The Third IUMRS International Conference on Advanced Materials. 6 (in printing). (1994)

Kouichi YASUDA：“裂纹路径对多晶 MgO 断裂韧性的影响”第三届 IUMRS 国际先进材料会议。