Effect of size polydispersity versus particle shape in dense granular media
In: ISSN: 1539-3755 ; EISSN: 1550-2376, 2014
Online
academicJournal
Zugriff:
International audience ; We present a detailed analysis of the morphology of granular systems composed of frictionless pentagonal particles by varying systematically both the size span and particle shape irregularity, which represent two polydispersity parameters of the system. The microstructure is characterized in terms of various statistical descriptors such as global and local packing fractions, radial distribution functions, coordination number, and fraction of floating particles.We find that the packing fraction increases with the two parameters of polydispersity, but the effect of shape polydispersity for all the investigated structural properties is significant only at low size polydispersity where the positional and/or orientational ordering of the particles prevail.We focus in more detail on the class of side/side contacts, which is the interesting feature of our system as compared to a packing of disks. We show that the proportion of such contacts has weak dependence on the polydispersity parameters. The sideside contacts do not percolate but they define clusters of increasing size as a function of size polydispersity and decreasing size as a function of shape polydispersity. The clusters have anisotropic shapes but with a decreasing aspect ratio as polydispersity increases. This feature is argued to be a consequence of strong force chains (forces above the mean), which are mainly captured by side-side contacts. Finally, the force transmission is intrinsically multiscale, with a mean force increasing linearly with particle size.
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Effect of size polydispersity versus particle shape in dense granular media
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Autor/in / Beteiligte Person: | Nguyen, Duc-Hanh ; Azéma, Émilien ; Radjai, Farhang ; Sornay, Philippe ; Physique et Mécanique des Milieux Divisés (PMMD) ; Laboratoire de Mécanique et Génie Civil (LMGC) ; Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) ; Laboratoire des Combustibles Uranium (LCU) ; Service d'Analyses, d'Elaboration, d'Expérientations et d'Examens des combustibles (SA3E) ; Département d'Etudes des Combustibles (DEC) ; Institut de recherche sur les systèmes nucléaires pour la production d'énergie bas carbone (CEA - DES) (IRESNE) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de recherche sur les systèmes nucléaires pour la production d'énergie bas carbone (CEA - DES) (IRESNE) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Département d'Etudes des Combustibles (DEC) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) |
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Zeitschrift: | ISSN: 1539-3755 ; EISSN: 1550-2376, 2014 |
Veröffentlichung: | HAL CCSD ; American Physical Society, 2014 |
Medientyp: | academicJournal |
DOI: | 10.1103/PhysRevE.90.012202 |
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