Self-organized magnetic particles to tune the mechanical behavior of a granular system
Résumé
Above a certain density a granular material jams. This property can be controlled
by either tuning a global property, such as the packing fraction or by applying shear strain, or at
the micro-scale by tuning grain shape, inter-particle friction or externally controlled organization.
Here, we introduce a novel way to change a local granular property by adding a weak anisotropic
magnetic interaction between particles. We measure the evolution of the pressure, P, and coordination
number, Z, for a packing of 2D photo-elastic disks, subject to uniaxial compression.
A fraction Rm of the particles have embedded cuboidal magnets. The strength of the magnetic
interactions between particles is too weak to have a strong direct effect on P or Z when the system
is jammed. However, the magnetic interactions play an important role in the evolution of latent
force networks when systems containing a large enough fraction of the particles with magnets
are driven through unjammed to jammed states. In this case, a statistically stable network of
magnetic chains self-organizes before jamming and overlaps with force chains once jamming occurs,
strengthening the granular medium. This property opens a novel way to control mechanical
properties of granular materials.
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