Avalanches in compressed porous SiO(2)-based materials.

Nataf, GF and Castillo-Villa, PO and Baró, J and Illa, X and Vives, E and Planes, A and Salje, E. K. H. (2014) Avalanches in compressed porous SiO(2)-based materials. Physical Review E statistical, nonlinear, and soft matter physics, 90. 022405. ISSN ISSN: 1539-3755, ESSN: 1550-2376 DOI 10.1103/PhysRevE.90.022405

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Official URL: http://dx.doi.org/10.1103/PhysRevE.90.022405

Abstract

The failure dynamics in SiO(2)-based porous materials under compression, namely the synthetic glass Gelsil and three natural sandstones, has been studied for slowly increasing compressive uniaxial stress with rates between 0.2 and 2.8 kPa/s. The measured collapsed dynamics is similar to Vycor, which is another synthetic porous SiO(2) glass similar to Gelsil but with a different porous mesostructure. Compression occurs by jerks of strain release and a major collapse at the failure point. The acoustic emission and shrinking of the samples during jerks are measured and analyzed. The energy of acoustic emission events, its duration, and waiting times between events show that the failure process follows avalanche criticality with power law statistics over ca. 4 decades with a power law exponent ɛ≃ 1.4 for the energy distribution. This exponent is consistent with the mean-field value for the collapse of granular media. Besides the absence of length, energy, and time scales, we demonstrate the existence of aftershock correlations during the failure process.

Item Type: Article
Uncontrolled Keywords: 2014AREP; IA68;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Physical Review E statistical, nonlinear, and soft matter physics
Volume: 90
Page Range: 022405
Identification Number: 10.1103/PhysRevE.90.022405
Depositing User: Sarah Humbert
Date Deposited: 21 Nov 2014 19:37
Last Modified: 18 Dec 2014 17:58
URI: http://eprints.esc.cam.ac.uk/id/eprint/3156

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