Abstract
Granular matter usually displays frozen, jamming and fluidized states when submitted to an external vibration with increasing intensity. The dissipation properties of granular systems with three different millimeter-size glass grains (0.1, 0.5 and 1.9 mm) have been investigated by a modified low-frequency inverted torsion pendulum under a shear strain and an external pressure. With increasing the immersed depth of the oscillating probe, all the systems show the frozen, jamming and fluidized behaviors. Furthermore, the critical depth at which the transition occurs increases with increasing grain size, but decreases with the application of pressure. A qualitative explanation is tentatively proposed to understand the underlying mechanism of complex viscoelastic properties of the glass particle systems.
Highlights
Granular materials consist of a collection of macroscopic discrete particles interacting solely via contact forces 1-3
By changing the external conditions, the frictional granular packing exhibits a complex jamming phase diagram and it shows several rheological regions, ranging from fluid-like, to jamming, to aging when they become trapped in frozen states . 7-16 At higher vibration intensities, the granular medium is fluidized
We investigated the frozen, jamming and fluidized transitions of glass bead packings with three different millimeter size grains (0.1, 0.5 and 1.9 mm) by monitoring viscoelastic behaviors with a low-frequency mechanical spectroscopy under a shear strain and an external pressure
Summary
Granular materials consist of a collection of macroscopic discrete particles interacting solely via contact forces 1-3. Perhaps the simplest example of such a system is a dense packing of spherical glass beads under pressure, where the pressure at first monotonically increases with the depth and saturates after a few layers by the Janssen model 6 Their physical behaviors involve complex nonlinear phenomena, such as energy dissipation and nonlinear elastic response, and have received much attention 4. We investigated the frozen, jamming and fluidized transitions of glass bead packings with three different millimeter size grains (0.1, 0.5 and 1.9 mm) by monitoring viscoelastic behaviors with a low-frequency mechanical spectroscopy under a shear strain and an external pressure. A qualitative explanation is proposed to interpret the experimental findings of the granular systems
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