Sound pulse broadening in stressed granular media

The pulse broadening and decay of coherent sound waves propagating in disordered granular media are investigated. We find that the pulse width of these compressional waves is broadened when the disorder is increased by mixing the beads made of different materials. To identify the responsible mechani...

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Bibliographic Details
Published inPhysical Review Special Topics: Physics Education Research Vol. 91; no. 2; p. 022205
Main Authors Langlois, Vincent, Jia, Xiaoping
Format Journal Article
LanguageEnglish
Published United States American Physical Society 01.02.2015
Subjects
Acoustics
Condensed Matter
Mechanics
Mechanics of materials
Physics
Soft Condensed Matter
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Summary:The pulse broadening and decay of coherent sound waves propagating in disordered granular media are investigated. We find that the pulse width of these compressional waves is broadened when the disorder is increased by mixing the beads made of different materials. To identify the responsible mechanism for the pulse broadening, we also perform the acoustic attenuation measurement by spectral analysis and the numerical simulation of pulsed sound wave propagation along one-dimensional disordered elastic chains. The qualitative agreement between experiment and simulation reveals a dominant mechanism by scattering attenuation at the high-frequency range, which is consistent with theoretical models of sound wave scattering in strongly random media via a correlation length.
ISSN:1554-9178
1550-2376
2469-9896
DOI:10.1103/PhysRevE.91.022205