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Updated: Jul 30, 2026

Microbubble Fabrication of Concave-porosity PDMS Beads
Published on: December 15, 2015
In-depth influence of the top surface fabrication of a bead packing
Luc Oger1, Renaud Delannay1, Yves Le Gonidec2
1Univ. Rennes, CNRS, IPR [(Institut de Physique de Rennes)]-UMR 6251, F-35000 Rennes, France.
Abstract:
Packings of beads confined in slowly tilted containers with a top free surface are commonly used in laboratory experiments to model natural grain avalanches and better understand and predict critical events from optical measurements of the surface activity. To that aim, after reproducible packing preparations, the present paper focuses on the effects of the surface fabrication, which can be scraped or soft leveled, on both the avalanche stability angle and the dynamic of precursory events for glass beads of 2-mm diameter. A depth effect of a scraping operation is highlighted by considering different packing heights and inclination speeds.

