Strain intermittency due to avalanches in ferroelastic and porous materials

Autor(en)

V. Soprunyuk, S. Puchberger, A. Tröster, Eduard Vives, Ekhard K H Salje, W. Schranz

Abstrakt

The avalanche statistics in porous materials and ferroelastic domain wall systems has been studied for slowly increasing compressive uniaxial stress with stress rates between 0.2 and 17 kPa s(-1). Velocity peaks v(m) = dh/dt are calculated from the measured strain drops and used to determine the corresponding Energy distributions N(E v(m)(2)). Power law distributions N(v(m)(2)) proportional to (v(m)(2))(-epsilon) have been obtained over 4-6 decades. For most of the porous materials and domain wall systems an exponent epsilon = 1.5 +/- 0.1 was obtained in good agreement with mean-field theory of the interface pinning transition. For charcoal, shale and calcareous schist we found significant deviations of the exponents from mean-field values in agreement with recent acoustic emission experiments.

Organisation(en)

Physik Funktioneller Materialien

Externe Organisation(en)

Technische Universität Wien, Universitat de Barcelona, University of Cambridge

Journal

Journal of Physics: Condensed Matter

Band

29

Anzahl der Seiten

7

ISSN

0953-8984

DOI

https://doi.org/10.1088/1361-648X/aa6bd2

Publikationsdatum

05-2017

Peer-reviewed

Ja

ÖFOS 2012

103015 Kondensierte Materie

Schlagwörter

ASJC Scopus Sachgebiete

Condensed Matter Physics, Allgemeine Materialwissenschaften

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/2121c16d-5969-43a5-9a57-44c16c1e4c6b