| Issue |
Europhys. Lett.
Volume 35, Number 2, July II 1996
|
|
|---|---|---|
| Page(s) | 145 - 150 | |
| Section | Cross-disciplinary physics and related areas of science and technology | |
| DOI | https://doi.org/10.1209/epl/i1996-00546-1 | |
| Published online | 01 September 2002 | |
Static compression of a granular medium: the “soft shell” model
Collège de France - 11 place M. Berthelot, 75231 Paris Cedex 05, France
Received:
5
December
1995
Accepted:
26
May
1996
An assembly of spheroidal particles in Hertzian
contact should display an elastic modulus 
proportional to
(where P is the pressure). We consider here a system where
each particle (diameter d) is covered with a soft shell (thickness
e, modulus μ) while the inside is rigid. This soft shell may, in
practice, be an oxide layer. We then expect 
for a
large range of pressures, in agreement with experiment. We also
discuss the average conductance 
, assuming a small
conductance in the soft shell, but ignoring tunnel effects. Then
.
PACS: 82.70.-y – Disperse systems / 91.60.Ba – Elasticity, fracture, and flow
© EDP Sciences, 1996
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