The emergence of granular matter features in a system of non-contact magnetic repelling particles.

IF 2.9 3区工程技术

Granular Matter Pub Date : 2025-09-10 DOI:10.1007/s10035-025-01566-z

M. Aguilar-González, L. F. Elizondo-Aguilera, Y. D. Sobral, F. Pacheco-Vázquez

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引用次数: 0

Abstract

We explored experimentally the static and dynamic behavior of magnetic repelling particles confined in a two-dimensional cell using two particle geometries, namely, disks and rectangular bars. Despite the contactless interaction, typical static features of granular materials are observed for both particle shapes when the material rearranges under the action of gravity: 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. When the material is forced to be rearranged by compression, particle shape effects become notorious: while disks rearrange increasing the hexagonal ordering, bars augment their orientational ordering forming larger non-contact force chains mediated by the magnetic field; 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. Our results indicate that continuum approaches of granular materials can be used to characterize the system, despite the contactless interaction and specific shape of the constitutive particles.

Graphical Abstract

Angle of repose, Janssen effect and other features of conventional granular matter are also observed in a system of contactless repelling particles.

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粒状物质的出现是一个非接触磁排斥粒子系统的特征。

我们通过实验探索了磁性排斥粒子在二维单元中的静态和动态行为，采用了两种粒子几何形状，即圆盘和矩形棒。尽管存在无接触相互作用，但在重力作用下，颗粒材料重新排列时，两种颗粒形状都具有典型的静态特征：具有休止角的桩形成和压力饱和（类杨森效应），这可以通过考虑产生颗粒与围壁之间摩擦的磁感应扭矩来解释。当材料因压缩而被迫重新排列时，粒子形状效应变得臭名昭著：当磁盘重新排列增加六边形排序时，棒材增强其方向排序，形成由磁场介导的更大的非接触力链；然而，在这两种情况下，压缩阻力持续上升，与具有颗粒间接触的颗粒系统特征的波动压缩动力学（粘滑运动或周期振荡）形成对比。我们的研究结果表明，颗粒材料的连续介质方法可以用来表征该系统，尽管本构颗粒的无接触相互作用和特定形状。在无接触排斥粒子体系中，还观察到常规颗粒物质的休止角、杨森效应等特征。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Granular Matter MATERIALS SCIENCE, MULTIDISCIPLINARY-MECHANICS

CiteScore

4.30

自引率

8.30%

发文量

期刊介绍： Although many phenomena observed in granular materials are still not yet fully understood, important contributions have been made to further our understanding using modern tools from statistical mechanics, micro-mechanics, and computational science. These modern tools apply to disordered systems, phase transitions, instabilities or intermittent behavior and the performance of discrete particle simulations. >> Until now, however, many of these results were only to be found scattered throughout the literature. Physicists are often unaware of the theories and results published by engineers or other fields - and vice versa. The journal Granular Matter thus serves as an interdisciplinary platform of communication among researchers of various disciplines who are involved in the basic research on granular media. It helps to establish a common language and gather articles under one single roof that up to now have been spread over many journals in a variety of fields. Notwithstanding, highly applied or technical work is beyond the scope of this journal.