The Jamming Transition in Granular Systems

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Recent simulations have predicted that near jamming for collections of spherical particles, there will be a discontinuous increase in the mean contact number, Z, at a critical volume fraction, phi_c. Above phi_c, Z and the pressure, P are predicted to increase as power laws in phi-phi_c. In experiments using photoelastic disks we corroborate a rapid increase in Z at phi_c and power-law behavior above phi_c for Z and P. Specifically we find power-law increase as a function of phi-phi_c for Z-Z_c with an exponent beta around 0.5, and for P with an exponent psi around 1.1. These exponents are in good agreement with simulations. We also find reasonable agreement with a recent mean-field theory for frictionless particles.
4 pages, 4 figures, 2 pages supplement; minor changes and clarifications, 2 addtl. refs., accepted for publication in Phys. Rev. Lett

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Soft Condensed Matter, Disordered Systems and Neural Networks, Statistical Mechanics

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http://salesiana.dossiersoluciones.com/handle/123456789/122724

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0610645
 http://arxiv.org/abs/cond-mat/0610645
 Phys. Rev. Lett. 98, 058001 (2007).
 doi:10.1103/PhysRevLett.98.058001

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arXiv