Microscopic origin of granular ratcheting

Details Microscopic origin of granular ratcheting Microscopic origin of granular ratcheting

2007-08-10

arxiv.org/abs/0708.1389v1

Physics

Condensed Matter

Soft Condensed Matter

13 pages, 18 figures

Scientific paper

10.1103/PhysRevE.77.031304

Numerical simulations of assemblies of grains under cyclic loading exhibit ``granular ratcheting'': a small net deformation occurs with each cycle, leading to a linear accumulation of deformation with cycle number. We show that this is due to a curious property of the most frequently used models of the particle-particle interaction: namely, that the potential energy stored in contacts is path-dependent. There exist closed paths that change the stored energy, even if the particles remain in contact and do not slide. An alternative method for calculating the tangential force removes granular ratcheting.

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