Cracking Piles of Brittle Grains

Details Cracking Piles of Brittle Grains Cracking Piles of Brittle Grains

1998-10-07

arxiv.org/abs/cond-mat/9810080v1

Phys. Rev. E 60 (1999) 1940-1945

Physics

Condensed Matter

Disordered Systems and Neural Networks

RevTeX, 6 pages, 7 postscript figures, submitted to Phys. Rev. E

Scientific paper

10.1103/PhysRevE.60.1940

A model which accounts for cracking avalanches in piles of grains subject to external load is introduced and numerically simulated. The stress is stochastically transferred from higher layers to lower ones. Cracked areas exhibit various morphologies, depending on the degree of randomness in the packing and on the ductility of the grains. The external force necessary to continue the cracking process is constant in wide range of values of the fraction of already cracked grains. If the grains are very brittle, the force fluctuations become periodic in early stages of cracking. Distribution of cracking avalanches obeys a power law with exponent $\tau = 2.4 \pm 0.1$.

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