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Particle shape dependence in 2D granular media

TitleParticle shape dependence in 2D granular media
Publication TypeJournal Article
Year of Publication2012
AuthorsSaint-Cyr B, Szarf K, Voivret C, Azéma E, Richefeu V, Delenne J-Y, Combe G, Nouguier-Lehon C, Villard P, Sornay P, Chaze M, Radjaï F
Corporate AuthorsCEGEO
JournalEPL (Europhysics Letters)
Volume98
Issue4
PaginationArticle Number: 44008
Date PublishedApr-20-2012
ISSN0295-5075
Abstract

Particle shape is a key to the space-filling and strength properties of granular matter. We consider a shape parameter

η describing the degree of distortion from a perfectly spherical shape. Encompassing most specific shape characteristics such as elongation, angularity and non-convexity, η is a low-order but generic parameter that we used in a numerical benchmark test for a systematic investigation of shape dependence in sheared granular packings composed of particles of different shapes. We find that the shear strength is an increasing function of η with nearly the same trend for all shapes, the differences appearing thus to be of second order compared to η. We also observe a non-trivial behavior of packing fraction which, for all our simulated shapes, increases with η from the random close packing fraction for disks, reaches a peak considerably higher than that for disks, and subsequently declines as η is further increased. These findings suggest that a low-order description of particle shape accounts for the principal trends of packing fraction and shear strength. Hence, the effect of second-order shape parameters may be investigated by considering different shapes at the same level of η.

DOI10.1209/0295-5075/98/44008
Short TitleEPL
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