Anomalous wave reflection at the interface of two strongly nonlinear granular media
Anomalous wave reflection at the interface of two strongly nonlinear granular media
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DOI：
10.1103/physrevlett.95.158702
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发表时间：
2005-10-07
影响因子：
8.6
通讯作者：
Jin, S
中科院分区：
文献类型：
--
作者：
Nesterenko, VF;Daraio, C;Jin, S
颗粒材料表现出强烈的非线性行为，影响能量和信息的传播。动态自组织强非线性孤立波是颗粒链中的主要信息载体。我们首次在实验上观察到了磁感应预压缩引起的两种颗粒介质界面上孤立波反射率的显著变化。将这种现象命名为“声学二极管”效应可能是恰当的。我们用界面附近粒子速度的高梯度来解释这种影响。
Granular materials exhibit a strongly nonlinear behavior affecting the propagation of energy and information. Dynamically self-organized strongly nonlinear solitary waves are the main information carriers in granular chains. We report the first experimental observation of the dramatic change of solitary wave reflectivity from the interface of two granular media triggered by a magnetically induced precompression. It may be appropriate to name this phenomenon the "acoustic diode" effect. We explain this effect by the high gradient of particle velocity near the interface.