Universität zu Köln

Kun, Ferenc ORCID: 0000-0001-6469-7917, Varga, Imre, Lennartz-Sassinek, Sabine and Main, Ian G. (2014). Rupture Cascades in a Discrete Element Model of a Porous Sedimentary Rock. Phys. Rev. Lett., 112 (6). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

We investigate the scaling properties of the sources of crackling noise in a fully dynamic numerical model of sedimentary rocks subject to uniaxial compression. The model is initiated by filling a cylindrical container with randomly sized spherical particles that are then connected by breakable beams. Loading at a constant strain rate the cohesive elements fail, and the resulting stress transfer produces sudden bursts of correlated failures, directly analogous to the sources of acoustic emissions in real experiments. The source size, energy, and duration can all be quantified for an individual event, and the population can be analyzed for its scaling properties, including the distribution of waiting times between consecutive events. Despite the nonstationary loading, the results are all characterized by power-law distributions over a broad range of scales in agreement with experiments. As failure is approached, temporal correlation of events emerges accompanied by spatial clustering.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Kun, Ferenc UNSPECIFIED orcid.org/0000-0001-6469-7917 UNSPECIFIED Varga, Imre UNSPECIFIED UNSPECIFIED UNSPECIFIED Lennartz-Sassinek, Sabine UNSPECIFIED UNSPECIFIED UNSPECIFIED Main, Ian G. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-445907
DOI:	10.1103/PhysRevLett.112.065501
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	112
Number:	6
Date:	2014
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1079-7114
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DEFORMATION; FRACTURE; FAILURE; GROWTH; GOUGE Multiple languages Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/44590