Sustematization Study of Toughening Mechanism in Ceramic-based Composites for Structural Use

结构用陶瓷基复合材料增韧机理的可持续化研究

基本信息

批准号：
03453077
负责人：
NISHIDA Toshihiko
金额：
$ 3.84万
依托单位：
Kyoto Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

项目摘要

Main perpose of this project is to establish the universal standerd for evaluation and to systematize the toughening mechanism for structural ceramics and ceramic based composites. As the result of this project, ceramic-based materials can be classified the following three categories : (1) Brittle ceramics ( K_<IC> values of them are less than 5 MPa m^<1/2> ) (2) Toughened ceramics ( K_<IC> values of them are 5-10 MPa m^<1/2> in a general sense, and they almostly shows the some toughening-enhancement mechanisms during the crack extesion ) (3) Fever-reinforced ceramics ( They have microfracture processes accompanied by the main crack extension of fiber-reinforced brittle matrix composites with "weak" interface bonding ) and the following conclusions were presented from our fracture mechanics studies of some ceramics and ceramic-based composites.The general low of linear-fracture mechanics was applicable for matreials (1) if only the special attention should be paid to the testing. Because the resistance ageinst crack extension in materials (2) is affected by the stress-shielding due to the process zone formed at the crack tip, due to the wake formed along the fracture surface, accurate analysis by non-linear fracture mechanics based on the damage-free crack or notch will be required. For the precise evaluation of mechanical properties for matreials (3), pluralistic analysis under tiesile, compression and shear mode will be indispensable.

该项目的主要持久性是建立用于评估的通用standerd，并系统化结构陶瓷和基于陶瓷的复合材料的加强机制。 As the result of this project, ceramic-based materials can be classified the following three categories : (1) Brittle ceramics ( K_<IC> values of them are less than 5 MPa m^<1/2> ) (2) Toughened ceramics ( K_<IC> values of them are 5-10 MPa m^<1/2> in a general sense, and they almostly shows the some toughening-enhancement mechanisms during the crack extesion ) (3)发烧增强陶瓷（它们具有微裂缝的过程，并伴随着纤维增强的脆性基质复合材料的主要裂纹扩展，具有“弱”的界面键合），并且从我们的一些基于陶瓷的陶瓷和陶瓷的调节材料进行的coramic和陶瓷的裂缝机制研究中得出了以下结论。测试。由于材料（2）中的电阻年龄扩展受到裂纹尖端处形成的过程区域的应力屏蔽的影响，这是由于沿断裂表面形成的尾流，因此需要基于无损害裂纹或缺乏漏洞的非线性断裂力学进行准确的分析。为了精确评估Matreials的机械性能（3），在划分下进行多元分析，压缩和剪切模式是必不可少的。