Anomalous wave reflection from the interface of two strongly nonlinear granular media

Details Anomalous wave reflection from the interface of two strongly nonlinear granular media Anomalous wave reflection from the interface of two strongly nonlinear granular media

2005-06-15

arxiv.org/abs/cond-mat/0506349v1

Physics

Condensed Matter

Soft Condensed Matter

14 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.95.158702

Granular materials exhibit a strongly nonlinear behaviour affecting the propagation of information in the medium. Dynamically self-organized strongly nonlinear solitary waves are the main information carriers in granular chains. Here we report the first experimental observation of the dramatic change of reflectivity from the interface of two granular media triggered by a noncontact magnetically induced initial precompression. It may be appropriate to name this phenomenon the "acoustic diode" effect. Based on numerical simulations, we explain this effect by the high gradient of particle velocity near the interface.

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