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陈猛,金海云,潘希德,王红洁,金志浩.评价多孔Si3N4陶瓷断裂韧性的新方法——单向压缩试验[J].稀有金属材料与工程(英文),2017,46(10):2883~2888.[Chen Meng,Jin Haiyun,Pan Xide,Wang Hongjie and Jin Zhihao.A Novel Method for Evaluating the Toughness of Porous Ceramics - Uniaxial Compression Testing[J].Rare Metal Materials and Engineering,2017,46(10):2883~2888.]
A Novel Method for Evaluating the Toughness of Porous Ceramics - Uniaxial Compression Testing
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Received:August 06, 2015  Revised:October 24, 2015
Key words: porous ceramics  fracture toughness(K1C)  single edge notched method  uniaxial compression testing  thermal shock damage resistance(R
Foundation item:国家自然科学基金资助(项目号51272206以及项目号51272208)
Author NameAffiliation
Chen Meng,Jin Haiyun,Pan Xide,Wang Hongjie and Jin Zhihao  
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      Traditionally, the fracture toughness (K1C) of porous ceramics is evaluated by single edge notched beam method (SENB). For porous ceramics, the fracture toughness by SENB increases with decreasing porosity, it demonstrating that lower porosity improve the crack propagation resistance. However, previous experimental experience suggests that the thermal shock damage resistance (R"""") of porous ceramics will be increased with increasing porosity, it demonstrating that the high-porosity ceramics have the better capability to improve the crack propagation resistance in thermal shock situation. It is obvious that the SENB method is concluded to be in contradiction with the thermal shock damage theory. The uniaxial compression testing of porous ceramic indicating that the σ-ε curve can be divided into two parts, linear part and nonlinear part. Due to the metastable propagation of multi-micro-crack, the σ-ε curve displays nonlinear behavior. The fracture energy measured by uniaxial compression testing can be also used to characterize the quantity of mirco-crack-toughen effect, it can improve the test method of fracture toughness for porous ceramics.