Synchronized oscillations and acoustic fluidization in confined granular materials

According to the acoustic fluidization hypothesis, elastic waves at a characteristic frequency form inside seismic faults even in the absence of an external perturbation. These waves are able to generate a normal stress which contrasts the confining pressure and promotes failure. Here, we study the...

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Main Authors: Giacco, F., de Arcangelis, L., Pica Ciamarra, Massimo, Lippiello, E.
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2018
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Online Access:https://hdl.handle.net/10356/87264
http://hdl.handle.net/10220/44371
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-872642023-02-28T19:33:01Z Synchronized oscillations and acoustic fluidization in confined granular materials Giacco, F. de Arcangelis, L. Pica Ciamarra, Massimo Lippiello, E. School of Physical and Mathematical Sciences Oscillations Granular Materials According to the acoustic fluidization hypothesis, elastic waves at a characteristic frequency form inside seismic faults even in the absence of an external perturbation. These waves are able to generate a normal stress which contrasts the confining pressure and promotes failure. Here, we study the mechanisms responsible for this wave activation via numerical simulations of a granular fault model. We observe the particles belonging to the percolating backbone, which sustains the stress, to perform synchronized oscillations over ellipticlike trajectories in the fault plane. These oscillations occur at the characteristic frequency of acoustic fluidization. As the applied shear stress increases, these oscillations become perpendicular to the fault plane just before the system fails, opposing the confining pressure, consistently with the acoustic fluidization scenario. The same change of orientation can be induced by external perturbations at the acoustic fluidization frequency. Published version 2018-02-01T07:39:49Z 2019-12-06T16:38:27Z 2018-02-01T07:39:49Z 2019-12-06T16:38:27Z 2018 Journal Article Giacco, F., de Arcangelis, L., Pica Ciamarra, M., & Lippiello, E. (2018). Synchronized oscillations and acoustic fluidization in confined granular materials. Physical Review E, 97(1), 010901-. 2470-0045 https://hdl.handle.net/10356/87264 http://hdl.handle.net/10220/44371 10.1103/PhysRevE.97.010901 en Physical Review E © 2018 American Physical Society (APS). This paper was published in Physical Review E and is made available as an electronic reprint (preprint) with permission of American Physical Society (APS). The published version is available at: [http://dx.doi.org/10.1103/PhysRevE.97.010901]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law. 5 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Oscillations
Granular Materials
spellingShingle Oscillations
Granular Materials
Giacco, F.
de Arcangelis, L.
Pica Ciamarra, Massimo
Lippiello, E.
Synchronized oscillations and acoustic fluidization in confined granular materials
description According to the acoustic fluidization hypothesis, elastic waves at a characteristic frequency form inside seismic faults even in the absence of an external perturbation. These waves are able to generate a normal stress which contrasts the confining pressure and promotes failure. Here, we study the mechanisms responsible for this wave activation via numerical simulations of a granular fault model. We observe the particles belonging to the percolating backbone, which sustains the stress, to perform synchronized oscillations over ellipticlike trajectories in the fault plane. These oscillations occur at the characteristic frequency of acoustic fluidization. As the applied shear stress increases, these oscillations become perpendicular to the fault plane just before the system fails, opposing the confining pressure, consistently with the acoustic fluidization scenario. The same change of orientation can be induced by external perturbations at the acoustic fluidization frequency.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Giacco, F.
de Arcangelis, L.
Pica Ciamarra, Massimo
Lippiello, E.
format Article
author Giacco, F.
de Arcangelis, L.
Pica Ciamarra, Massimo
Lippiello, E.
author_sort Giacco, F.
title Synchronized oscillations and acoustic fluidization in confined granular materials
title_short Synchronized oscillations and acoustic fluidization in confined granular materials
title_full Synchronized oscillations and acoustic fluidization in confined granular materials
title_fullStr Synchronized oscillations and acoustic fluidization in confined granular materials
title_full_unstemmed Synchronized oscillations and acoustic fluidization in confined granular materials
title_sort synchronized oscillations and acoustic fluidization in confined granular materials
publishDate 2018
url https://hdl.handle.net/10356/87264
http://hdl.handle.net/10220/44371
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