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research-article

Incoherent waves in fluid-saturated sintered granular systems: Scattering phenomena

[+] Author and Article Information
Ibrahim Gueven

Institute of Mechanics, Ruhr-University Bochum, Universitätsstr. 150, D-44 801 Bochum, Germany
ibrahim.gueven@gmx.de

Stefan Luding

Multi-Scale Mechanicsa/MESA, ET, University of Twente, Drienerlolaan 5, 7522 NB Enschede, The Netherlands
s.luding@utwente.nl

Holger Steeb

Institute of Applied Mechanics (CE), University of Stuttgart, Pfaffenwaldring 7, D-70 569 Stuttgart, Germany
steeb@ist.uni-stuttgart.de

1Corresponding author.

ASME doi:10.1115/1.4037701 History: Received December 28, 2016; Revised August 05, 2017

Abstract

The incoherent transport of ultrasound waves in water-saturated sintered glass bead packings is experimentally investigated. The spectral energy density of scattered high-frequency waves is explained by a diffusion wave equation. Immersion broadband transducers with central frequencies of 1 MHz are positioned at a distance of 73mm to the porous sample. The diffusion coefficient and quality factor are predicted from a diffusion approximation of the time-dependent intensity curve to the ensemble averaged measurement data. From the diffusion coefficient we deduce a mean-free path for scattering events at l* = 0:87 ± 0:03mm close to the range of particle diameters of the samples (1:0 < dp < 1:2 mm). Results are in good agreement with observations from Jia et al. [1] observed for non-sintered and consolidated bead packings (0:6 < dp < 0:8 mm). The low quality factor Q = 190 ± 10 indicates a high-amount of intrinsic damping of the scattered waves although water was used as saturating and coupling fluid.

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