IFISUR   23398
INSTITUTO DE FISICA DEL SUR
Unidad Ejecutora - UE
artículos
Título:
Uniform shock waves in disordered granular matter
Autor/es:
LEOPOLDO R. GÓMEZ; A. M. TURNER; V. VITELLI
Revista:
PHYSICAL REVIEW E - STATISTICAL PHYSICS, PLASMAS, FLUIDS AND RELATED INTERDISCIPLINARY TOPICS
Editorial:
APS
Referencias:
Año: 2012 vol. 86 p. 413021 - 4130211
ISSN:
1063-651X
Resumen:
The confining pressure P is
perhaps the most important parameter controlling the properties of
granular matter. Strongly compressed granular media are, in many
respects, simple solids in which elastic perturbations travel as
ordinary phonons. However, the speed of sound in granular aggregates
continuously decreases as the confining pressure decreases, completely
vanishing at the jamming-unjamming transition. This anomalous behavior
suggests that the transport of energy at low pressures should not be
dominated by phonons. In this work we use simulations and theory to show
how the response of granular systems becomes increasingly nonlinear as
pressure decreases. In the low-pressure regime the elastic energy is
found to be mainly transported through nonlinear waves and shocks. We
numerically characterize the propagation speed, shape, and stability of
these shocks and model the dependence of the shock speed on pressure and
impact intensity by a simple analytical approach.