Sound wave propagation in weakly polydisperse granular materials

Mouraille, O. and Luding, S. (2008) Sound wave propagation in weakly polydisperse granular materials. Ultrasonics, 48 (6-7). pp. 498-505. ISSN 0041-624X

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Abstract:	Dynamic simulations of wave propagation are performed in dense granular media with a narrow polydisperse size-distribution and a linear contact-force law. A small perturbation is created on one side of a static packing and its propagation, for both P- and S-waves, is examined. A size variation comparable to the typical contact deformation already changes sound propagation considerably. The transmission spectrum becomes discontinuous, i.e., a lower frequency band is transmitted well, while higher frequencies are not, possibly due to attenuation and scattering. This behaviour is qualitatively reproduced for (i) Hertz non-linear contacts, for (ii) frictional contacts, (iii) for a range of smaller amplitudes, or (iv) for larger systems. This proves that the observed wave propagation and dispersion behaviour is intrinsic and not just an artifact of (i) a linear model, (ii) a frictionless packing, (iii) a large amplitude non-linear wave, or (iv) a finite size effect.
Item Type:	Article
Copyright:	© 2008 Elsevier
Faculty:	Engineering Technology (CTW)
Research Group:	Engineering Fluid Dynamics (EFD)
Link to this item:	http://purl.utwente.nl/publications/80339
Official URL:	http://dx.doi.org/10.1016/j.ultras.2008.03.009
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