2025/06/27 by Aguilar-González, M., Elizondo-Aguilera, L. F., Sobral, Y. D. +1
#Applied Physics (physics.app-ph) #Classical Physics (physics.class-ph) #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #Soft Condensed Matter (cond-mat.soft)
paper · doi:10.48550/arxiv.2507.08816
We explored experimentally the self-organization at rest and the compression dynamics of a two-dimensional array of magnetic repelling particles, using two particle geometries, namely, disks and rectangular bars. Despite the non-contact interaction, typical static features of granular materials are observed for both particle shapes: pile formation with an angle of repose and pressure saturation (Janssen-like effect), which can be explained by considering the magnetically-induced torques that generate friction between particles and confining walls. Particle shape effects are mainly observed during compression: while disks rearrange increasing the hexagonal ordering, bars augment their orientational ordering forming larger non-contact force chains; however, in both cases, the resistance to compression rises continuously, in contrast with the fluctuating compression dynamics (stick-slip motion or periodic oscillations) that characterizes granular systems with inter-particle contacts. The continuous response to compression, and the reduction of particle wear due to non-contact interactions, are desirable features in designing magnetic granular dampers.