Revealing the structure of a granular medium through ballistic sound propagation.
Phys Rev Lett
; 113(9): 098001, 2014 Aug 29.
Article
em En
| MEDLINE
| ID: mdl-25216006
ABSTRACT
We study the propagation of sound through a bidimensional granular medium consisting of photoelastic disks, which are packed into different crystalline and disordered structures. Acoustic sensors placed at the boundaries of the system capture the acoustic signal produced by a local and well-controlled mechanical excitation. By compressing the system, we find that the speed of the ballistic part of the acoustic wave behaves as a power law of the applied force with both exponent and prefactor sensitive to the internal geometry of the contact network. This information, which we are able to link to the force-deformation relation of single grains under different contact geometries, provides enough information to reveal the structure of the granular medium.
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01-internacional
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MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Ano de publicação:
2014
Tipo de documento:
Article
País de afiliação:
França