Space-filling bearings

Herrmann, H. W.; Mantica, Giorgio; Bessis, D.

doi:10.1103/physrevlett.65.3223

Cited by 108 publications

(94 citation statements)

References 5 publications

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“…In view of the large amount of energy consumed worldwide for the transport of granular materials, this merits a more detailed study. It has been suggested for dry sand that the polydisperse grains can form the sand's own ball-bearing system, in which friction is minimized by a size segregation that allows the grains to roll over each other with little friction [20]; perhaps a similar mechanism is at play here.…”

Section: Prl 112 175502 (2014) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 99%

Sliding Friction on Wet and Dry Sand

et al. 2014

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General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. We show experimentally that the sliding friction on sand is greatly reduced by the addition of some-but not too much-water. The formation of capillary water bridges increases the shear modulus of the sand, which facilitates the sliding. Too much water, on the other hand, makes the capillary bridges coalesce, resulting in a decrease of the modulus; in this case, we observe that the friction coefficient increases again. Our results, therefore, show that the friction coefficient is directly related to the shear modulus; this has important repercussions for the transport of granular materials. In addition, the polydispersity of the sand is shown to also have a large effect on the friction coefficient.

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Section: Prl 112 175502 (2014) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 99%

Sliding Friction on Wet and Dry Sand

et al. 2014

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“…However, space-filling packings of disks are possible, where the smallest loops in the contact network are polygons with more than three sides. Examples, where the loops all have an even number of sides are of particular interest, since they can act as space-filling bearings, where all the disks can rotate at the same time without slip [55,57]. An example of a space-filling bearings with 'base loop size' 4 and 'n = m'.…”

Section: B Other Self-similar Packingsmentioning

confidence: 99%

Self-similar disk packings as model spatial scale-free networks

Doye¹,

Massen²

2005

Phys. Rev. E

140

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The network of contacts in space-filling disk packings, such as the Apollonian packing, are examined. These networks provide an interesting example of spatial scale-free networks, where the topology reflects the broad distribution of disk areas. A wide variety of topological and spatial properties of these systems are characterized. Their potential as models for networks of connected minima on energy landscapes is discussed.

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“…This lattice can be defined based of the ancient problem of filling space with spheres, first tackled by the Greek mathematician Apollonius of Perga [10]. In its two dimensional version, corresponding to the problem of the plane filled by circles, the nodes of this network are defined by the positions of the centers of the circles, while edges are drawn between any pair of nodes corresponding to pairs of touching circles [11]. The resulting network, corresponds to the contact force network of the packing [12].…”

Section: Introductionmentioning

confidence: 99%