Force Fluctuations in Bead Packs

Experimental observations and numerical simulations of the large force inhomogeneities present in stationary bead packs are presented. Forces much larger than the mean occurred but were exponentially rare. An exactly soluble model reproduced many aspects of the experiments and simulations. In this m...

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Veröffentlicht in:	Science (American Association for the Advancement of Science) 1995-07, Vol.269 (5223), p.513-515
Hauptverfasser:	C.-h. Liu, Nagel, S. R., Schecter, D. A., Coppersmith, S. N., Majumdar, S., Narayan, O., Witten, T. A.
Format:	Artikel
Sprache:	eng
Schlagworte:	Carbon Chemistry Colloidal state and disperse state Cylinders Exact sciences and technology Force distribution Fractions General and physical chemistry Granular materials Mathematics Mechanical stress Modeling Physical and chemical studies. Granulometry. Electrokinetic phenomena Physics Polarized light Scientific Concepts Self consistent fields Simulations
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Beschreibung
Zusammenfassung:	Experimental observations and numerical simulations of the large force inhomogeneities present in stationary bead packs are presented. Forces much larger than the mean occurred but were exponentially rare. An exactly soluble model reproduced many aspects of the experiments and simulations. In this model, the fluctuations in the force distribution arise because of variations in the contact angles and the constraints imposed by the force balance on each bead in the pile.
ISSN:	0036-8075 1095-9203
DOI:	10.1126/science.269.5223.513