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| HAL : hal-00395466, version 1 |
| PubMed : 18352017 |
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| Physical Review E: Statistical, Nonlinear, and Soft Matter Physics 77, 2 Pt 1 (2008) 021302 |
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| Sound propagation in a constrained lattice of beads: high-frequency behavior and dispersion relation. |
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| Christophe Coste 1Bruno Gilles 2, 3 |
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| (02/2008) |
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| We report on acoustic wave propagation in a regular array of nominally identical beads under isotropic static stress. The weak polydispersity of the beads makes the contact lattice random. Time-frequency analysis of the acoustic signal is performed and allows measurement of the full lattice dispersion relation. Comparison with the theoretical prediction for a perfect triangular lattice gives an indication of the level of randomness in the contact lattice. The results extend, in a consistent way, a previous study restricted to long wavelength propagation [B. Gilles and C. Coste, Phys. Rev. Lett. 90, 174302 (2003)]: The contact lattice is ordered by increasing the stress, and the smaller the wavelength, the higher the stress required to get regular lattice behavior. Measurements involving ballistic propagation of the coherent wave, whatever its frequency, evidence reversible lattice behavior under compression and/or decompression. Nevertheless, correlations of short wavelength incoherent waves are a sensitive probe of disorder, and allow us to exhibit a small irreversible evolution of the lattice. |
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| 1 : | Laboratoire Ecologie Fonctionnelle et Environnement (EcoLab) |
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PRES Université de Toulouse – Institut National Polytechnique de Toulouse - INPT – Université Paul Sabatier [UPS] - Toulouse III – Observatoire Midi-Pyrénées – CNRS : UMR5245 |
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| 2 : | Science et Ingénierie des Matériaux et Procédés (SIMAP) |
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CNRS : UMR5266 – Université Joseph Fourier - Grenoble I – Institut National Polytechnique de Grenoble (INPG) |
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| 3 : | Applications des ultrasons à la thérapie |
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INSERM : U556 – Université Claude Bernard - Lyon I |
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| Domaine | : | Sciences du Vivant/Ingénierie biomédicale |
| hal-00395466, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00395466 | |
| oai:hal.archives-ouvertes.fr:hal-00395466 | |
| Contributeur : Isabelle Besançon | |
| Soumis le : Lundi 15 Juin 2009, 16:15:38 | |
| Dernière modification le : Lundi 15 Juin 2009, 16:15:38 | |
