Crack propagation and fatigue in zirconia-based composites
Crack propagation and fatigue in zirconia-based composites
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DOI：
10.1016/s1359-835x(98)00145-6
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发表时间：
1999-01-01
影响因子：
8.7
通讯作者：
Fantozzi, G
中科院分区：
文献类型：
--
作者：
Chevalier, J;Olagnon, C;Fantozzi, G
本文回顾了现有已发表的关于氧化锆基复合材料裂纹扩展行为的研究。本文的第一部分涉及静态载荷下的慢速裂纹扩展 (SCG)。氧化锆陶瓷中的 SCG 被证明是裂纹尖端水分子应力腐蚀的结果。相变增韧对 SCG 的影响通过应力强度因子来讨论，以减少传播的净驱动力。该命题与 3Y-TZP 和 Mg-PSZ 陶瓷获得的结果一致。提出了一条可大致适用于所有氧化锆陶瓷的主曲线。还讨论了添加氧化锆对氧化铝陶瓷（ZTA陶瓷）的影响。本文的第二部分讨论循环加载下的 SCG。通过裂纹屏蔽的减少观察到所有氧化锆基复合材料的机械退化。与静态疲劳情况相比，氧化锆基复合材料在循环载荷下的降解导致速度增加。与静态疲劳的情况一样，还可以获得主曲线。循环疲劳结果根据裂纹尖端处的应力腐蚀以及配筋减少来解释。 (C) 1999 Elsevier Science Ltd. 保留所有权利。
This paper reviews existing published studies on crack propagation behavior of zirconia-based composites. The first part of the paper is concerned with slow crack growth (SCG) under static loading. SCG in zirconia ceramics is shown to be a consequence of stress corrosion by water molecules at the crack tip. The influence of transformation toughening on SCG is discussed in terms of a stress intensity factor acting to reduce the net driving force for propagation. This proposition is in agreement with results obtained on 3Y-TZP and Mg-PSZ ceramics. A master curve is proposed which could be applied roughly to all zirconia ceramics. The influence of zirconia addition to alumina ceramics (ZTA ceramics) is also discussed. The second part of the paper deals with SCG under cyclic loading. A mechanical degradation of all zirconia-based composites is observed by a decrease of crack shielding. This degradation of zirconia-based composites under cyclic loading leads to increased velocities as compared to the static fatigue case. A master curve is also obtained, as in the case of static fatigue. Cyclic fatigue results are interpreted in terms of stress corrosion at the crack tip assisted by a decrease of the reinforcement. (C) 1999 Elsevier Science Ltd. All rights reserved.