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Study on the Thermal Shock Fracture Mechanism of Ceramics Based on the Dynamic Characterization of Thermal Stress and Microfracture Process

基于热应力动态表征和微断裂过程的陶瓷热震断裂机理研究

基本信息

批准号：
15360349
负责人：
WAKAYAMA Shuichi
金额：
$ 9.73万
依托单位：
TOKYO METROPOLITAN UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

Ceramic materials used at elevated temperatures are usually subjected to damage due to thermal shock fracture. One of the most popular thermal shock tests is the water quench test, in which the critical temperature difference, where samples are subjected to severe damage, is used as a measure of the thermal shock resistance. However the characterization of microfracture process under thermal shock as well as transient thermal stress field is indispensable, since thermal shock fracture is caused by the accumulation of microscopic damages such as microcrackings under thermal stress. In this project, a new experimental technique for the investigation of thermal shock fracture behavior, Disc-on-Rod test, is proposed. The temperature fields in the specimen were measured and used to calculate the 2 dimensional thermal stress field. Furthermore, microfracture process was characterized by AE measurement. In the present project, followings have been achieved.1. Experimental system of Disc-on-Rod test was significantly developed. The in-situ observation of crack initiation and propagation behavior under thermal shock was enabled by digital video camera unit. Furthermore, the 3D-analysis of thermal stress was enabled by introducing full-version FEM code (ANSYS).2. The crack propagation behavior under thermal shock was characterized dynamically. The dependence of crack stability on the length of pre-crack was understood quantitatively, which showed good agreement of theoretical prediction by Hasselman's unified theory. In addition, the crack growth behavior of toughened ceramic composites was characterized successfully.3. Non-destructive evaluation technique of microfracture process in ceramics under mechanical loading was drastically developed and applied to bioceramics. The assessment technique of long-term reliability of ceramics was developed and will be applied to thermal shock fracture.

高温下使用的陶瓷材料通常会受到热冲击断裂的破坏。最流行的热冲击试验之一是水淬试验，在这种试验中，样品受到严重破坏的临界温差被用作耐热冲击性能的衡量标准。然而，由于热冲击断裂是由微裂纹等微观损伤在热应力作用下的积累引起的，因此对热冲击下的微断裂过程以及瞬态热应力场的表征是必不可少的。本项目提出了一种研究热冲击断裂行为的新实验技术——盘片对杆试验。测量了试样内的温度场，并计算了二维热应力场。通过声发射测量对微断裂过程进行表征。在目前的项目中，实现了以下几点：1。盘片棒上试验系统得到了显著发展。采用数字摄像机对热冲击下的裂纹萌生和扩展行为进行了现场观察。引入全版有限元分析程序（ANSYS），实现了热应力的三维分析。对热冲击下裂纹扩展行为进行了动态表征。定量地了解了裂纹稳定性对预裂纹长度的依赖关系，这与Hasselman统一理论的理论预测相吻合。此外，还成功地表征了增韧陶瓷复合材料的裂纹扩展行为。机械载荷作用下陶瓷微断裂过程无损检测技术得到了迅速发展，并应用于生物陶瓷领域。开发了陶瓷长期可靠性评估技术，并将其应用于热冲击断裂。

项目成果

期刊论文数量（31）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Acoustic Emission from Micro-Fracture Processes of Bio-Ceramics in Simulated Body Environment

模拟人体环境中生物陶瓷微断裂过程的声发射

DOI：
发表时间：
2003
期刊：
Journal of Acoustic Emission Vol.21
影响因子：
0
作者：
Shuichi WAKAYAMA;Teppei KAWAKAMI;Satoshi KOBAYASHI;Mamoru AIZAWA;Akira NOZUE
通讯作者：
Akira NOZUE

Long-Term Reliability Assessment of Bioceramics for Artificial Joints using Microdamage Monitoring by AE

使用 AE 微损伤监测对人工关节生物陶瓷进行长期可靠性评估

DOI：
发表时间：
2006
期刊：
Key Engineering Materials Vols.309-311
影响因子：
0
作者：
Shuichi WAKAYAMA;Teppei KAWAKAMI;Junji IKEDA
通讯作者：
Junji IKEDA

AE Morinotoring of Microdamages in Bioceramics for Artificial Joints under Simulated Body Environment

模拟人体环境下人工关节生物陶瓷微损伤的声发射监测

DOI：
发表时间：
2006
期刊：
JSME International Journal Vol.49,No.1
影响因子：
0
作者：
Shuichi WAKAYAMA;Yasuhiro SUZUKI;Toyokatsu OSHIMA;Satoshi KOBAYASHI
通讯作者：
Satoshi KOBAYASHI

Experimental Approach to Microfracture Process of Ceramics under Thermal Shock

陶瓷热冲击微断裂过程的实验方法

DOI：
发表时间：
2005
期刊：
Fracture Mechanics of Ceramics
影响因子：
0
作者：
Shuichi WAKAYAMA;Kousuke NISHINO;Kouhei KUBOTA;Toshiya WADA;Satoshi KOBAYASHI
通讯作者：
Satoshi KOBAYASHI

熱衝撃を受けるSiCウィスカ強化アルミナ/ジルコニアセラミックスにおけるき裂進展特性

SiC晶须增强氧化铝/氧化锆陶瓷热冲击下的裂纹扩展特性