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Crassous J, Humeau A, Boury S, et al. Pressure-Dependent Friction on Granular Slopes Close to Avalanche. Phys Rev Lett. 2017;119(5):058003doi: 10.1103/PhysRevLett.119.058003.
Crassous, J., Humeau, A., Boury, S., & Casas, J. (2017). Pressure-Dependent Friction on Granular Slopes Close to Avalanche. Physical review letters, 119(5), 058003. https://doi.org/10.1103/PhysRevLett.119.058003
Crassous, Jérôme, et al. "Pressure-Dependent Friction on Granular Slopes Close to Avalanche." Physical review letters vol. 119,5 (2017): 058003. doi: https://doi.org/10.1103/PhysRevLett.119.058003
Crassous J, Humeau A, Boury S, Casas J. Pressure-Dependent Friction on Granular Slopes Close to Avalanche. Phys Rev Lett. 2017 Aug 04;119(5):058003. doi: 10.1103/PhysRevLett.119.058003. Epub 2017 Aug 03. PMID: 28949714.
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Phys Rev Lett. 2017 Aug 04;119(5):058003. doi: 10.1103/PhysRevLett.119.058003. Epub 2017 Aug 03.

Pressure-Dependent Friction on Granular Slopes Close to Avalanche.

Physical review letters

Jérôme Crassous, Antoine Humeau, Samuel Boury, Jérôme Casas

Affiliations

  1. Université Rennes 1, Institut de Physique de Rennes (UMR UR1-CNRS 6251), Campus de Beaulieu, F-35042 Rennes, France.
  2. Institut de Recherche sur la Biologie de l'Insecte, UMR 7261 CNRS-Université François-Rabelais, 37200 Tours, France.
  3. Office National de la Chasse et de la Faune Sauvage, Direction de la Recherche et de l' Expertise, Unité Sanitaire de la Faune, F-78610 Auffargis, France.
  4. École Normale Supérieure de Lyon, 69007 Lyon, France.
  5. Institut Universitaire de France, 75231 Paris, France.

PMID: 28949714 DOI: 10.1103/PhysRevLett.119.058003

Abstract

We investigate the sliding of objects on an inclined granular surface close to the avalanche threshold. Our experiments show that the stability is driven by the surface deformations. Heavy objects generate footprintlike deformations which stabilize the objects on the slopes. Light objects do not disturb the sandy surfaces and are also stable. For intermediate weights, the deformations of the surface generate a sliding of the objects. The solid friction coefficient does not follow the Amontons-Coulomb laws, but is found minimal for a characteristic pressure. Applications to the locomotion of devices and animals on sandy slopes as a function of their mass are proposed.

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