Stress distribution in static two dimensional granular model media in the absence of friction

Details Stress distribution in static two dimensional granular model media in the absence of friction Stress distribution in static two dimensional granular model media in the absence of friction

1997-01-08

arxiv.org/abs/cond-mat/9701050v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

to be published in Phys. Rev. E 17 pages PS file including figures

Scientific paper

10.1103/PhysRevE.55.4720

We present simulations of static model sandpiles in two dimensions (2D) and focus on the stress distribution in such arrays made of discrete particles. We use the simplest possible model, i.e. spherical particles with a linear spring and a linear dashpot active on contact and without any frictional forces. Our model is able to reproduce several recent theoretical predictions. For different boundary conditions we examine the contact network and the stresses in the array and at the bottom of the pile. In some cases we observe a dip, i.e. the relative minimum in pressure, under the center of the pile. We connect the dip to arching, and we relate arching to the structure of the contact network. Finally, we find that small polydispersity is sufficient to cause a so called stress-network, i.e. strong fluctuations in stress. From those data we determine the probability distribution for the vertical stress at the bottom and relate it to theoretical and other numerical work.

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