Title: Acoustical measurement of the shear modulus for thin porous layers
Authors: Allard, Jean Fran├žois ×
Henry, M
Boeckx, Laurens
Leclaire, Philippe
Lauriks, Walter #
Issue Date: Jan-2005
Publisher: Acoustical soc amer amer inst physics
Series Title: Journal of the acoustical society of america vol:117 issue:4 pages:1737-1743
Abstract: Simulations performed with the Biot theory show that for thin porous layers, a shear mode of the structure can be induced by a point-source in air located close to the layer. The simulations show that this mode is present around frequencies where the quarter wavelength of the shear Biot wave is equal to the thickness of the samples and show that it can be acoustically detected from the fast variations with frequency of the location of a pole of the reflection coefficient close to grazing incidence. The mode has been detected with this method for two reticulated plastic foams. For one of the foams studied, the velocity and the damping of the Rayleigh wave have been measured on a thicker layer of the same medium at higher frequencies, giving a real part of the shear modulus close to the one obtained from the measured location of the pole. The strong coupling of the shear mode with the acoustic field in air allows the measurement of the shear modulus without mechanical excitation. (c) 2005 Acoustical Society of America.
ISSN: 0001-4966
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Soft Matter and Biophysics
× corresponding author
# (joint) last author

Files in This Item:

There are no files associated with this item.

Request a copy


All items in Lirias are protected by copyright, with all rights reserved.

© Web of science