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Abstract: In dense, static, polydisperse granular media under isotropic pressure, theprobability density and the correlations of particle-wall contact forces arestudied. Furthermore, the probability density functions of the populations ofpressures measured with different sized circular pressure cells is examined.The questions answered are: i What is the number of contacts that has to beconsidered so that the measured pressure lies within a certain error marginfrom its expectation value? ii What is the statistics of the pressureprobability density as function of the size of the pressure cell? Astonishingnon-random correlations between contact forces are evidenced, which range atleast 10 to 15 particle diameter. Finally, an experiment is proposed to tackleand better understand this issue.



Author: Stefan Luding, Micha-Klaus Mueller, Thorsten Poeschel

Source: https://arxiv.org/



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