Predicting failure: acoustic emission of berlinite under compression.

Nataf, GF and Castillo-Villa, PO and Sellappan, P and Kriven, WM and Vives, E and Planes, A and Salje, E. K. H. (2014) Predicting failure: acoustic emission of berlinite under compression. Journal of Physics: Condensed Matter, 26. p. 275401. ISSN 0953-8984, 1361-648X DOI 10.1088/0953-8984/26/27/275401

[img]
Preview
Text
0953-8984_26_27_275401.pdf - Published Version
Available under License Creative Commons Attribution.

Download (1MB) | Preview
[img]
Preview
Image
cm495848f01_hr.jpg - Published Version
Available under License Creative Commons Attribution.

Download (160kB) | Preview
Official URL: http://iopscience.iop.org/0953-8984/26/27/275401/a...

Abstract

Acoustic emission has been measured and statistical characteristics analyzed during the stress-induced collapse of porous berlinite, AlPO4, containing up to 50 vol porosity. Stress collapse occurs in a series of individual events (avalanches), and each avalanche leads to a jerk in sample compression with corresponding acoustic emission (AE) signals. The distribution of AE avalanche energies can be approximately described by a power law p(E)dE = E(-ε)dE (ε ~ 1.8) over a large stress interval. We observed several collapse mechanisms whereby less porous minerals show the superposition of independent jerks, which were not related to the major collapse at the failure stress. In highly porous berlinite (40 and 50) an increase of energy emission occurred near the failure point. In contrast, the less porous samples did not show such an increase in energy emission. Instead, in the near vicinity of the main failure point they showed a reduction in the energy exponent to ~ 1.4, which is consistent with the value reported for compressed porous systems displaying critical behavior. This suggests that a critical avalanche regime with a lack of precursor events occurs. In this case, all preceding large events were 'false alarms' and unrelated to the main failure event. Our results identify a method to use pico-seismicity detection of foreshocks to warn of mine collapse before the main failure (the collapse) occurs, which can be applied to highly porous materials only.

Item Type: Article
Additional Information: We acknowledge financial support from CICyT, (Spain) (Project Nº MAT2013-40590-P). E.K.H.S. is grateful for support by the Leverhulme fund (RG66640) and EPSRC (EP/K009702/1). PC-V acknowledges support from CONACYT (Mexico) under scholarship no. 186474. PS and WMK acknowledge a United States Army Research Office MURI grant (W911NF-09-1-0436), through Dr David Stepp. The scanning electron microscopy (SEM) and x-ray analysis works were carried out in the Frederick Seitz Materials Research Laboratory at the University of Illinois at Urbana-Champaign
Uncontrolled Keywords: 2014AREP; IA68;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
07 - Gold Open Access
Journal or Publication Title: Journal of Physics: Condensed Matter
Volume: 26
Page Range: p. 275401
Identification Number: 10.1088/0953-8984/26/27/275401
Depositing User: Sarah Humbert
Date Deposited: 21 Nov 2014 19:24
Last Modified: 18 Dec 2014 17:58
URI: http://eprints.esc.cam.ac.uk/id/eprint/3162

Actions (login required)

View Item View Item

About cookies