Crackling noise during failure of alumina under compression: the effect of porosity

Castillo-Villa, Pedro O. and Baró, Jordi and Planes, Antoni and Salje, Ekhard K. H. and Sellappan, Pathikumar and Kriven, Waltraud M. and Vives, Eduard (2013) Crackling noise during failure of alumina under compression: the effect of porosity. Journal of Physics: Condensed Matter, 25 (29). p. 292202. ISSN 0953-8984, ESSN: 1361-648X DOI https://doi.org/10.1088/0953-8984/25/29/292202

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Abstract

We study acoustic emission avalanches during the process of failure of porous alumina samples (Al2O3) under compression. Specimens with different porosities ranging from 30% to 59% have been synthesized from a mixture of fine-grained alumina and graphite. The compressive strength as well as the characteristics of the acoustic activity have been determined. The statistical analysis of the recorded acoustic emission pulses reveals, for all porosities, a broad distribution of energies with a fat tail, compatible with the existence of an underlying critical point. In the region of 35%–55% porosity, the energy distributions of the acoustic emission signals are compatible with a power-law behaviour over two decades in energy with an exponent ϵ = 1.8 ± 0.1.

Item Type:	Article
Uncontrolled Keywords:	2013AREP; IA66;
Subjects:	03 - Mineral Sciences
Divisions:	03 - Mineral Sciences
Journal or Publication Title:	Journal of Physics: Condensed Matter
Volume:	25
Page Range:	p. 292202
Identification Number:	https://doi.org/10.1088/0953-8984/25/29/292202
Depositing User:	Sarah Humbert
Date Deposited:	06 Jul 2013 23:39
Last Modified:	08 Aug 2013 12:11
URI:	http://eprints.esc.cam.ac.uk/id/eprint/2822

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