Inertial drag in granular media

Athani, Shivakumar; Rognon, Pierre

doi:10.48550/arxiv.1907.05613

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Gravity Relaxation Time1

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2020

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“…which is proportional to the time for a grain to free fall on a distance d under the action of the gravity. This relaxation time was found to be pivotal to explain the mobility of plates subjected to cyclic or transient loadings [16,17]. Accordingly, we introduce a dimensionless number G, which we refer to as relaxation number, as the ratio of these two times:…”

Section: Gravity Relaxation Timementioning

confidence: 99%

Rate-dependent drag instability in granular materials

Hossain

Rognon

2020

Preprint

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We investigate the conditions leading to large drag force fluctuations in granular materials. The study is based on a set of experimental drag tests, which involve pulling a plate vertically through a cohesionless granular material. In agreement with previous observations, drag force exhibits significant and sudden dropsup to 60%-when the plate is pulled out at low velocities. We further find that this instability vanishes at higher pullout velocities and near the surface. We empirically characterise the frequency and amplitude of these fluctuations and find that these properties are not consistent with a classical stick-slip dynamics. We therefore propose an alternative physical mechanism that can explain these force fluctuations.

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Section: Gravity Relaxation Timementioning

confidence: 99%