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.

分散粒子和基质之间的弹性MSMATCH或热膨胀不匹配对固定陶瓷复合材料的断裂韧性的影响是通过等效纳入方法提出的。该理论通过粒子分散的多晶型mullite的实验结果进行了验证。与配备有弯曲测试固定装置的次级电子显微镜观察到多晶氧化铝中的显微镜裂纹延伸。这表明用马尔可夫工艺解释了微观裂纹。通过思考断裂韧性与经晶体断裂的比例之间的关系，局部断裂韧性（跨颗粒裂缝的断裂韧性和颗粒间骨间骨折的裂缝韧性）被定量评估。

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)

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。

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）。

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。