V. Magnanimo et al 2008 EPL 81 34006 doi:10.1209/0295-5075/81/34006
Characterizing the shear and bulk moduli of an idealized granular material
V. Magnanimo1, L. La Ragione1, J. T. Jenkins2, P. Wang3 and H. A. Makse3
Show affiliationsPhysical experiments on wave propagation on granular material control two macroscopic parameters that are assumed to characterize the response of a given assembly: the isotropic pressure p0 and the solid volume fraction 
. Here, by means of numerical simulation, we investigate the effect of the coordination number 
(the average number of contacts per particle) and the fluctuation of the number of contacts per particle Z'. We adopt a numerical protocol to create several initial packings characterized by the same volume fraction and, for a given isotropic pressure, we are able to obtain different coordination numbers. That is, pressure and coordination number, for a given volume fraction, are independent. The result is that packings with fixed volume fraction and isotropic pressure exhibit a different elastic response. We attribute this behavior only to the coordination number as we find, surprisingly, that 
is linked to Z'.
- PACS
- Subjects
- Dates
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Issue 3 (February 2008)
Received 2 October 2007, accepted for publication 30 November 2007
Published 3 January 2008
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Characterizing the shear and bulk moduli of an idealized granular material
V. Magnanimo et al 2008 EPL 81 34006
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