Crack deflection toughening mechanism in brittle materials

被引：5

作者：

Awaji, H ^{[1
]}

Ebisudani, M ^{[1
]}

Choi, SM ^{[1
]}

Ohashi, T ^{[1
]}

机构：

[1] Nagoya Inst Technol, Showa Ku, Nagoya, Aichi 4668555, Japan

来源：

FRACTURE RESISTANCE TESTING OF MONOLITHIC AND COMPOSITE BRITTLE MATERIALS | 2002年 / 1409卷

关键词：

toughening mechanism; crack deflection; self-reinforced ceramics; Griffith criterion; multilayered composites;

D O I：

10.1520/STP10476S

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Toughening mechanisms in polycrystalline ceramics and ceramic-based composites were discussed based on Griffith's energy equilibrium and classified into three groups: (A) the frontal process-zone toughening mechanism, (B) the crack-bridging mechanism, and (C) the macroscopic crack-deflection mechanism. The increase in fracture toughness caused by enforced macroscopic crack-deflection was estimated using the energy equilibrium between the energy-release rate and the fracture-energy rate. The analytical results revealed that the fracture toughness under Mode I loading was enhanced by twice the normal value when the crack propagates in the. direction 90degrees from its original plane. Under Mode II loading the fracture toughness is increased 1.2 times the normal value when the crack propagates in its original plane. Crack-deflection tests were carried out by using wooden, thin rectangular plates with a central crack. The increase in the fracture toughness caused by crack deflection was confirmed and the experimental data was coincident with the calculated results.

引用

页码：137 / 151

页数：15

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