Dresden 2026 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 19: Franco-German Session on Granular Matter I

DY 19.7: Vortrag

Dienstag, 10. März 2026, 11:30–11:45, HÜL/S186

Elastic Soft-Shell Packings — •Eric Opsomer and Nicolas Vandewalle — University of Liege, Liege, Belgium

The evolution of pressure at the bottom of a two-dimensional pile of thin elastic rings is investigated for increasing filling height of the system. Due to the soft nature of the particles, contact forces are only weakly deviated which causes a delay of the pressure saturation that is commonly observed in hard grain system. More importantly, for large fillings, an abrupt transition within the structure of the granular pile is encountered once the surrounding pressure leads to the buckling of the rings composing the bottom layers of the pile. The latter transition can be predicted based on the mechanical properties of the thin rings and the global evolution of pressure can be modeled by extending Janssen's model to an effective two-phase granular media.

Keywords: Granular matter; Buckling; Force network; Janssen law; Silo