%0 Conference Proceedings
%T Vibrational dynamics of 3D granular media composed with polyhedral grains
%T Dinámica vibracional de un medio granular 3D compuesto de partículas poliédricas
%+ Physique et Mécanique des Milieux Granulaires (PMMG)
%+ Laboratoire de Mécanique et Génie Civil (LMGC)
%+ Réseaux, Moyens Informatiques, Calcul Scientifique (Remics)
%+ Département recherche et développements (R&D - SNCF)
%A Azéma, Emilien
%A Radjai, Farhang
%A Peyroux, Robert
%A Dubois, Frédéric
%A Saussine, Gilles
%< avec comité de lecture
%( IX Congreso de Geotecnia, Sociedad Colombiana de geotecnia
%B IX Congreso de Geotecnia, Sociedad Colombiana de geotecnia
%C Bogotà, Colombia
%P 8
%8 2008-09-01
%D 2008
%Z 0807.3205
%K Contact Dynamic
%K granular
%K polyedric particles
%K vibrations
%Z Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph]
%Z Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph]Conference papers
%X By means of tree-dimensional contact dynamics simulations, we analyze the vibrational dynamics of a confined granular layer in response to harmonic forcing. The sample is composed of polyedric grains with a shape derived from digitalized ballast. The system involves a jammed state separating passive (loading) and active (unloading) states. We show that an approximate expression of the packing resistance force as a function of the displacement of the free retaining wall from the jamming position provides a good description of the dynamics. We study in detail the scaling of displacements and velocities with loading parameters. In particular, we find that, for a wide range of frequencies, the data collapse by scaling the displacements with the inverse square of frequency, the inverse of the force amplitude and the square of gravity. We show that the mean compaction rate increases linearly with frequency up to a characteristic frequency of 10 Hz and then it declines in inverse proportion to frequency.
%G English
%Z Projet Ecos Nord
%2 https://hal.science/hal-00300813/document
%2 https://hal.science/hal-00300813/file/SCG_Azema.pdf
%L hal-00300813
%U https://hal.science/hal-00300813
%~ CNRS
%~ LMGC
%~ MIPS
%~ UNIV-MONTPELLIER
%~ UM-2015-2021