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Title: Avalanches in compressed porous SiO2-based materials
Author: Nataf, Guillaume F.
Castillo-Villa, Pedro O.
Baró i Urbea, Jordi
Illa i Tortos, Xavier
Vives i Santa-Eulàlia, Eduard
Planes Vila, Antoni
Ealje, E.K.H.
Keywords: Materials porosos
Sistemes autoorganitzatius
Mecànica de fractura
Porous materials
Self-organizing systems
Fracture mechanics
Issue Date: 15-Aug-2014
Publisher: American Physical Society
Abstract: The failure dynamics in SiO2-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 SiO2 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 ε 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.
Note: Reproducció del document publicat a:
It is part of: Physical Review E, 2014, vol. 90, num. 022405, p. 022405-1-022405-9
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ISSN: 1539-3755
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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