Abstract
We are numerically and experimentally studying the response of a 3d granular system to cyclic perturbations to investigate reversibility and memory effects. We are especially interested in translations and rotations of particles are affected by the inter-particle friction coefficient. We find that at low friction, the rotations are homogeneously distributed in the system; the motion of particles is mostly reversible and the system exhibit a very strong memory response. In contrast, at high friction, the rotations are located in a narrow shear band, and are mostly irreversible which leads to a much less pronounced memory response of the system. This can be explained by the need for the system to overcome a large sliding force limit which is only possible for a small proportion of particles, leading to a non-reversible motion.
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