Quantitative Analysis of Crack Shielding Degradation During Cyclic Fatigue of Alumina

Grain bridging degradation behind a crack tip is the main cyclic fatigue mechanism in nontransforming ceramics. In this work, a compliance function is used to quantify the shielding capacity of grain bridges during cyclic loading of alumina ceramics with different grain sizes. This allows to identif...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2005-01, Vol.88 (1), p.172-178
Main Authors: Attaoui, Hassan El, Saâdaoui, Malika, Chevalier, Jérôme, Fantozzi, Gilbert
Format: Article
Language:English
Subjects:
Alumina
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Ceramics
Chemical industry and chemicals
Condensed matter: structure, mechanical and thermal properties
Cracks
Engineering Sciences
Exact sciences and technology
Fatigue, brittleness, fracture, and cracks
Grain size
Materials
Materials fatigue
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Miscellaneous
Physics
Technical ceramics
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Summary:Grain bridging degradation behind a crack tip is the main cyclic fatigue mechanism in nontransforming ceramics. In this work, a compliance function is used to quantify the shielding capacity of grain bridges during cyclic loading of alumina ceramics with different grain sizes. This allows to identify the different stages occurring during cyclic loading. Significant degradation is observed in the coarse grain material and a marked sensitivity to the loading level is outlined. At moderate loads, bridging degradation occurs prior to fatigue crack growth during an incubation period which can reach several million cycles. At low cyclic loads, the shielding capacity can be entirely degraded, leading to a cyclic fatigue threshold equivalent to that of the fine grain material.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1551-2916.2004.00037.x