Ultrasound propagation in externally stressed granular media
Ultrasound propagation in externally stressed granular media
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DOI：
10.1103/physrevlett.82.1863
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发表时间：
1999-03-01
影响因子：
8.6
通讯作者：
Velicky, B
中科院分区：
文献类型：
--
作者：
Jia, X;Caroli, C;Velicky, B
给出了颗粒玻璃微珠在固结载荷作用下脉冲超声传输的实验观测。在发射的信号中，我们观察到通过有效接触介质的相干弹道脉冲和散斑状多次散射信号的共存。这些信号的相对幅度强烈地依赖于珠子尺寸与波长和检测器尺寸的比率。实验数据支持最近关于颗粒介质内非均匀应力场的描述。[S0031-9007(99)08548-8]。
Experimental observations of pulsed ultrasonic transmission through granular glass beads under oedometric loading are presented. We observe in the transmitted signals the coexistence of a coherent ballistic pulse traveling through an "effective contact medium" and a specklelike multiply scattered signal. The relative amplitudes of these signals strongly depend on the ratios of the bead size to the wavelength and to the detector size. Experimental data support recent descriptions of the inhomogeneous stress field within granular media. [S0031-9007(99)08548-8].