期刊
COMPTES RENDUS PHYSIQUE
卷 16, 期 1, 页码 3-9出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.crhy.2015.01.003
关键词
Matiere granulaire; Chaines de force; Effet de voute; Exclusions steriques; Dynamique des contacts; Dynamique moleculaire
The probability density function of contact forces in granular materials has been extensively studied and modeled as an outstanding signature of granular microstructure. Arguing that particle environments play a fundamental role in force transmission, we analyze the effects of steric constraints with respect to force balance condition and show that each force may be considered as resulting from a balance between lower and larger forces in proportions that mainly depend on steric effects. This idea leads to a general model that predicts an analytical expression of force density with a single free parameter. This expression fits well our simulation data and generically predicts the exponential fall-off of strong forces, a small peak below the mean force and the non-zero probability of vanishingly small forces. (C) 2015 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
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