2021/12/05 by T. Irie, Terunori Irie, R. Yamaguchi +5
Engineering · Physics and Astronomy · #Centrifugal force #Characterization (materials science) #Deformation (meteorology) #Geotechnical Engineering and Soil Mechanics #Geotechnical and Geomechanical Engineering #Granular flow and fluidized beds #Granular material #Granular matter #Pile #astro-ph.EP #cond-mat.soft
paper · pdf · doi:10.1103/physreve.104.064902
10 pages, 5 figures
arxiv created 2021/12/05 · openalex publication_date 2021/12/16 · openalex created_date 2021/12/31 · arxiv updated 2022/01/05 · openalex updated_date 2026/08/05
Although the gravity dependence of granular friction is crucial to understand various natural phenomena, its precise characterization is difficult. We propose a method to characterize granular friction under various gravity (body force) conditions controlled by centrifugal force; specifically, the deformation of a rotated granular pile was measured. To understand the mechanics governing the observed nontrivial deformation of this pile, we introduced an analytic model considering local force balance. The excellent agreement between the experimental data and theoretical model suggests that the deformation is simply governed by the net body force (sum of gravity and centrifugal force) and friction angle. The body-force dependence of granular friction was precisely measured from the experimental results. The results reveal that the grain shape affects the degree of body-force dependence of the granular friction.