Long-Term Reliability of Brittle Materials: The Issue of Crack Arrest

[+] Author and Article Information
Yann Charles, François Hild

LMT-Cachan, ENS de Cachan/UMR CNRS/Université Paris 6, 61 avenue du Président Wilson, F-94235 Cachan Cedex, France

Stéphane Roux

Laboratoire “Surface du Verre et Interfaces”, UMR CNRS/Saint-Gobain, 39 quai L. Lefranc, F-93303 Aubervilliers Cedex, France

J. Eng. Mater. Technol 125(3), 333-340 (Jul 10, 2003) (8 pages) doi:10.1115/1.1580854 History: Received March 12, 2002; Revised January 08, 2003; Online July 10, 2003
Copyright © 2003 by ASME
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Propagation path from an initial length a to a final length b intersecting sites of spacing 1/λ and random toughness
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Time-correction function Φ versus dimensionless time λCT for different values of the sensitivity exponent m when μ=0.6
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Identification of the crack propagation parameters μ, C,m from conventional Evans-Wiederhorn parameters A,p for a 99.6% alumina ceramic for a conventional value of V0
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Thin-walled tube of average radius R and thickness h. Frame of a volume element of the tube and distribution of stresses σzz and σφφ through the thickness.
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Longitudinal crack initiated on the outer surface of the tube. Initial semicircular crack and channelling crack experiencing a steady-state propagation.
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Crack extension probability versus dimensionless extension length for different values of the cumulative probability H[KSSΦ(T)]. Three different regimes can be observed.




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