2018/04/25 by Oscar V. Saavedra, Oscar Saavedra V., Hervé Elettro +1
Engineering · Materials Science · Physics and Astronomy · #Amplitude #Elastic modulus #Exponential function #Granular flow and fluidized beds #Granular material #Limit (mathematics) #Material Dynamics and Properties #Modulus #Nonlocal and gradient elasticity in micro/nano structures #Normal force #Stress (linguistics) #cond-mat.mtrl-sci #cond-mat.soft
paper · pdf · doi:10.1103/physrevmaterials.2.043603
published as Physical Review Materials, 2(4):043603 (2018) · 6 pages, 5 figures
arxiv created 2018/04/25 · openalex publication_date 2018/04/25 · arxiv updated 2018/04/26 · openalex created_date 2018/05/07 · openalex updated_date 2026/08/05
Confined granular materials are known to undergo exponential screening of surface stresses due to particle-wall friction. Here, the authors investigate the transition to the friction-dominated jammed state and map the gradual development of the internal stress profile with flexible pressure sensors. Surprisingly, they observe that screening builds up much more slowly than previously thought. They explain this behavior in terms of progressive friction mobilization, where the full amplitude of the frictional forces is only reached after a macroscopic local displacement. At further stages of compression, the authors find that a gradient of elastic modulus may exist in large aspect ratio confinements. This dramatically enhances the local screening, well beyond the full mobilization limit described by Janssen's model.