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

Pedro O. Castillo-Villa, Jordi Baró, Antoni Planes, Ekhard K.H. Salje, Pathikumar Sellappan, Waltraud M. Kriven, Eduard Vives

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Article number292202
JournalJournal of Physics Condensed Matter
Volume25
Issue number29
DOIs
StatePublished - Jul 24 2013

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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