摘要
本文采用压力敏感相变准则和权函数法对相变增韧陶瓷Ⅲ型裂纹的增韧效应进行了理论预测,分别给出了静止裂纹和定常扩展裂纹相变塑性屏蔽的理论表达式。结果表明:相变体积膨胀对增韧无贡献,裂尖屏蔽来自于晶格剪切和裂纹扩展尾区的贡献。
The fracture toughness enhancement of mode Ⅲ crack in transformation toughened ceramics such as Ce-TZP and Mg-PSZ is predicted by using a pressure sensitive transformation criterion and the weight function method. The theoretical analyses of the toughening effect for both stationary and steady-state growing crack are given, respectively. The results show that the toughening is only associated with crack growth and there is no toughening effect for stationary crack.
出处
《固体力学学报》
CAS
CSCD
北大核心
1991年第4期298-303,共6页
Chinese Journal of Solid Mechanics
基金
国家自然科学基金
关键词
相变增韧
Ⅲ型
裂纹
剪切塑性
陶瓷
transformation toughening, mode Ⅲ crack, shear plasticity, stationary and steady state growing crack
