Rattler-induced aging dynamics in jammed granular systems

Granular materials jam when developing a network of contact forces able to resist the applied stresses. Through numerical simulations of the dynamics of the jamming process, we show that the jamming transition does not occur when the kinetic energy vanishes. Rather, as the system jams, the kinetic e...

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Bibliographic Details
Published inSoft matter Vol. 13; no. 48; pp. 9132 - 9137
Main Authors Giacco, Ferdinando, de Arcangelis, Lucilla, Pica Ciamarra, Massimo, Lippiello, Eugenio
Format Journal Article
LanguageEnglish
Published England Royal Society of Chemistry 13.12.2017
Subjects
Aging
Aging (artificial)
Cages
Computer simulation
Contact stresses
Energy
Granular materials
Jamming
Kinetic energy
Kinetics
Particulates
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Summary:Granular materials jam when developing a network of contact forces able to resist the applied stresses. Through numerical simulations of the dynamics of the jamming process, we show that the jamming transition does not occur when the kinetic energy vanishes. Rather, as the system jams, the kinetic energy becomes dominated by rattler particles, which scatter within their cages. The relaxation of the kinetic energy in the jammed configuration exhibits a double power-law decay, which we interpret in terms of the interplay between backbone and rattler particles. In jammed granular systems the kinetic energy has a slow relaxation controlled by rattlers.
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ISSN:1744-683X
1744-6848
DOI:10.1039/c7sm01976a