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Glassiness, Rigidity, and Jamming of Frictionless Soft Core Disks
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
Dept of Phys and Astr, Univ of Rochester, Rochester, NY14627.
2011 (English)In: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, ISSN 1539-3755, Vol. 83, no 3, 031307- p.Article in journal (Refereed) Published
Abstract [en]

The jamming of bidisperse soft core disks is considered, using a variety of different protocols to produce the jammed state. In agreement with other works, we find that cooling and compression can lead to a broad range of jamming packing fractions ϕJ, depending on cooling rate and initial configuration; the larger the degree of big particle clustering in the initial configuration, the larger will be the value of ϕJ. In contrast, we find that shearing disrupts particle clustering, leading to a much narrower range of ϕJ as the shear strain rate varies. In the limit of vanishingly small shear strain rate, we find a unique nontrivial value for the jamming density that is independent of the initial system configuration. We conclude that shear driven jamming is a unique and well-defined critical point in the space of shear driven steady states. We clarify the relation between glassy behavior, rigidity, and jamming in such systems and relate our results to recent experiments.

Place, publisher, year, edition, pages
American Physical Society , 2011. Vol. 83, no 3, 031307- p.
Keyword [en]
National Category
Condensed Matter Physics
URN: urn:nbn:se:umu:diva-52156DOI: 10.1103/PhysRevE.83.031307ISI: 000288790800003OAI: diva2:499298
Swedish Research Council, 2010-3725
Available from: 2012-02-14 Created: 2012-02-13 Last updated: 2013-12-18Bibliographically approved
In thesis
1. Jamming and Soft-Core Rheology
Open this publication in new window or tab >>Jamming and Soft-Core Rheology
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Many different physical systems, such as granular materials, colloids, foams and emulsions exhibit a jamming transition where the system changes from a liquid-like flowing state to a solid jammed state as the packing fraction increases. These systems are often modeled using soft-core particles with repulsive contact forces. In this thesis we explore several different dynamical models for these kinds of systems, and see how they affect the behavior around the jamming transition. We investigate the effect of different types of dissipative forces on the rheology, and study how different methods of preparing a particle configuration affect their probability to jam when quenched. We study the rheology of sheared systems close to the jamming transition. It has been proposed that the athermal jamming transition is controlled by a critical point, point J, with certain scaling properties. We investigate this using multivariable scaling analysis based on renormalization group theory to explore the scaling properties of the transition and determine the position of point J and some of the critical exponents.

Place, publisher, year, edition, pages
Umeå: Umeå Universitet, 2013. 56 p.
jamming, rheology, soft matter, granular material, SLLOD, critical point, critical scaling
National Category
Condensed Matter Physics
urn:nbn:se:umu:diva-84200 (URN)978-91-7459-784-4 (ISBN)
Public defence
2014-01-17, KB3A9 (Lilla hörsalen), Umeå University KBC building, Umeå, 10:00 (English)
Available from: 2013-12-19 Created: 2013-12-17 Last updated: 2013-12-19Bibliographically approved

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