期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 100, 期 10, 页码 4374-4396出版社
WILEY
DOI: 10.1111/jace.15108
关键词
cracks/cracking; elastic materials/properties; fracture mechanics/toughness; glass; indentation
资金
- FP7 Ideas: European Research Council [320506]
- European Research Council [320506]
- JSPS KAKENHI [15H04124, 16K06730]
- Grants-in-Aid for Scientific Research [16K06730, 15H04124] Funding Source: KAKEN
- European Research Council (ERC) [320506] Funding Source: European Research Council (ERC)
Measuring the fracture toughness (K-Ic) of glasses still remains a difficult task, raising experimental and theoretical problems as well. The available methods to estimate K-Ic are reviewed, with emphasis on their respective advantages and drawbacks. In view of our current understanding, this analysis gives precedence to the SEPB method. The ultimate glass strength, the critical flaw size, and the indentation load for the onset of crack initiation are discussed, in the light of the fundamentals of fracture mechanics and classical background regarding the mechanics of brittle materials. Analytical expressions were further proposed to predict the fracture energy and fracture toughness of glasses from different chemical systems from their nominal compositions. The theoretical values were compared with the experimental ones, as obtained by self-consistent methods when available. The agreement observed in most cases suggests that measured K-Ic values correspond to the crack propagation regime (as opposed to the crack initiation threshold), and supports previous investigations in glasses and ceramics, which showed that a crack tip is nearly atomically sharp in these materials (but for metallic glasses). Some ideas to design tougher glasses are finally presented.
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