Short-time dynamics of a packing of polyhedral grains under horizontal vibrations

Abstract

We analyze the dynamics of a 3D granular packing composed of particles of irregular polyhedral shape confined inside a rectangular box with a retaining wall sub jected to horizontal harmonic forcing. The simulations are performed by means of the contact dynamics method for a broad set of loading parameters. We explore the vibrational dynamics of the packing, the evolution of solid fraction and the scaling of dy- namics with the loading parameters. We show that the motion of the retaining wall is strongly anharmonic as a result of jamming and grain rearrangements. It is found that the mean particle displacement scales with inverse square of frequency, the inverse of the force amplitude and the square of gravity. The short- time compaction rate grows in proportion to frequency up to a characteristic frequency, corresponding to collective particle rearrangements between equilibrium states, and then it declines in inverse proportion to frequency.

References in corpus (5)

• Patterns and Collective Behavior in Granular Media: Theoretical Concepts
• Size separation in vibrated granular matter
• Ratcheting of granular materials
• Vibrational dynamics of confined granular material
• Importance of convection in the compaction mechanisms of anisotropic granular media

Cited by in corpus (4)

• Stress-strain behavior and geometrical properties of packings of elongated particles
• Force chains and contact network topology in packings of elongated particles
• Effect of confinement on dense packings of rigid frictionless spheres and polyhedra
• Vibrational dynamics of 3D granular media composed with polyhedral grains -- Dinámica vibracional de un medio granular 3D compuesto de partículas poliédricas