Volume 51, Number 3, August I 2000
|Page(s)||293 - 299|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||01 September 2002|
Dissipative dynamics of granular media investigated by forced torsion pendulum
Institut de Génie Atomique, Ecole Polytechnique
Fédérale de Lausanne CH-1015 Lausanne, Switzerland
Accepted: 19 May 2000
The oscillating probe of a low-frequency (1 Hz) forced torsion pendulum is immersed into a granular medium, and the dynamic moduli are measured. A first layer of grains is firmly fixed to the probe surface. The energy losses of the system are determined by the statistical properties of force-chains opposing the rotation of the pendulum. The position of the observed loss peak is found to be quadratically dependent on the radius and on the depth of immersion of a cylindrical probe, and proportional to the coefficient of static friction between the grains. The logarithmic moisture-induced ageing effect is also observed.
PACS: 46.55.+d – Tribology and mechanical contacts / 45.70.-n – Granular systems / 81.05.Rm – Porous materials; granular materials
© EDP Sciences, 2000
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