Elastic wave propagation in confined granular systems

Details Elastic wave propagation in confined granular systems Elastic wave propagation in confined granular systems

2004-08-06

arxiv.org/abs/cond-mat/0408128v2

Phys. Rev. E 72, 021301 (2005)

Physics

Condensed Matter

Statistical Mechanics

20 pages, 12 figures; changes throughout text, especially Section V.A

Scientific paper

10.1103/PhysRevE.72.021301

We present numerical simulations of acoustic wave propagation in confined granular systems consisting of particles interacting with the three-dimensional Hertz-Mindlin force law. The response to a short mechanical excitation on one side of the system is found to be a propagating coherent wavefront followed by random oscillations made of multiply scattered waves. We find that the coherent wavefront is insensitive to details of the packing: force chains do not play an important role in determining this wavefront. The coherent wave propagates linearly in time, and its amplitude and width depend as a power law on distance, while its velocity is roughly compatible with the predictions of macroscopic elasticity. As there is at present no theory for the broadening and decay of the coherent wave, we numerically and analytically study pulse-propagation in a one-dimensional chain of identical elastic balls. The results for the broadening and decay exponents of this system differ significantly from those of the random packings. In all our simulations, the speed of the coherent wavefront scales with pressure as $p^{1/6}$; we compare this result with experimental data on various granular systems where deviations from the $p^{1/6}$ behavior are seen. We briefly discuss the eigenmodes of the system and effects of damping are investigated as well.

Affiliated with

Also associated with

No associations

Rating

Elastic wave propagation in confined granular systems does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Elastic wave propagation in confined granular systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Elastic wave propagation in confined granular systems will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-500631