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On loading rate effects in toughening processes

Tandon, S. and Faber, K. T. (1996) On loading rate effects in toughening processes. Scripta Materialia, 34 (5). pp. 757-762. ISSN 1359-6462. doi:10.1016/1359-6462(95)00586-2.

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Environmental crack tip reactions are a known source of premature fracture in oxides. These rate-dependent phenomena commonly are studied in strength tests where loading rate serves as the major experimental variable. A material susceptible to environmentally-assisted crack growth is stronger at fast testing rates. A topic which has received far less attention is the influence of stressing rate or loading rate on the shielding processes which occur at some distance from the crack tip, although the inverse has been studied by Deuerler et al. In their work, the crack velocity-stress intensity, v-K, curve was measured as a function of crack length in alumina. The v-K curve shifted to higher stress intensities for longer cracks, indicative of greater shielding as the crack grew progressively up the K_R (resistance) curve. In this paper, we explore the influence of loading rate on the fracture toughness of two aluminum oxides, one which fails in a brittle fashion (i.e., where toughness is independent of crack length), and a second which demonstrates significant resistance curve behavior due to grain bridging behind the crack tip. We present here the first known documentation of a loading rate effect on shielding phenomena in ceramic materials.

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Faber, K. T.0000-0001-6585-2536
Additional Information:Copyright © 1996 Acta Materialia Inc. Published by Elsevier. (Received September 13, 1995). 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:5
Record Number:CaltechAUTHORS:20140908-181326751
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Official Citation:S. Tandon, K.T Faber, On loading rate effects in toughening processes, Scripta Materialia, Volume 34, Issue 5, 1 March 1996, Pages 757-762, ISSN 1359-6462, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49421
Deposited By: George Porter
Deposited On:10 Sep 2014 15:47
Last Modified:10 Nov 2021 18:43

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