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The influence of loading rate on crack bridging processes in Al_2O_3

Tandon, S. and Faber, K. T. (1998) The influence of loading rate on crack bridging processes in Al_2O_3. Acta Materialia, 46 (10). pp. 3547-3555. ISSN 1359-6454. doi:10.1016/S1359-6454(98)00023-8.

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Commercially available alumina of 94% nominal purity was used to examine the influence of loading rate on toughening mechanisms. For fine-grained alumina, the crack resistance, K_R, was found to be independent of crack length and loading rate. Coarse-grained alumina exhibited strongly rising R-curves where the initial fracture toughness, K_0, was found to be independent of the loading rate. The net toughening, ΔK_(SS), in coarse-grained alumina was found to decrease with increasing loading rate. Loading rate effects were independent of testing environment. A rate dependent coefficient of friction was incorporated into a crack bridging model to describe the effect of loading rate on toughness in this system. Predictions based on the bridging models, using the measured coefficients of friction for this material system, are in good agreement with the observed phenomenon.

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Faber, K. T.0000-0001-6585-2536
Alternate Title:The influence of loading rate on crack bridging processes in Al2O3
Additional Information:© 1998 Acta Metallurgica Inc. Published by Elsevier. (Received 15 September 1997; accepted in revised form 31 December 1997) This work was supported by the National Science Foundation Center for Advanced Cement Based Materials at Northwestern University.
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Issue or Number:10
Record Number:CaltechAUTHORS:20140908-181325151
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49408
Deposited By: George Porter
Deposited On:09 Sep 2014 19:19
Last Modified:10 Nov 2021 18:43

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