Static and dynamic ordering of magnetic repelling particles under confinement: disks vs bars
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| Format: | Preprint |
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2025
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| author | Aguilar-González, M. Elizondo-Aguilera, L. F. Sobral, Y. D. Pacheco-Vázquez, F. |
| author_facet | Aguilar-González, M. Elizondo-Aguilera, L. F. Sobral, Y. D. Pacheco-Vázquez, F. |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2507_08816 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Static and dynamic ordering of magnetic repelling particles under confinement: disks vs bars Aguilar-González, M. Elizondo-Aguilera, L. F. Sobral, Y. D. Pacheco-Vázquez, F. Soft Condensed Matter Applied Physics Classical Physics Fluid Dynamics 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. |
| title | Static and dynamic ordering of magnetic repelling particles under confinement: disks vs bars |
| topic | Soft Condensed Matter Applied Physics Classical Physics Fluid Dynamics |
| url | https://arxiv.org/abs/2507.08816 |