Temperature dependence of elasticity of poro-elastic layer

Christ Glorieux , Jan Descheemaeker (1) , Jean-Philippe Groby (2) , Laurens Boeckx , Poonam Khurana

1 Laboratory of Acoustics and Thermal Physics
2 LAUM - Laboratoire d'Acoustique de l'Université du Mans

Besides their structural complexity, the acoustic behaviour of polymer-based poro-elastic layers is also complicated due to their frequency dependent elasticity. In this work, we address the frequency and temperature dependence of the elastic behaviour in general, and the shear modulus in particular, of poro-visco-elastic materials. The analysis is based on the monitoring of mechanically excited guided acoustic wave propagation by means of a laser Doppler vibrometer scanning technique. The concept and practical implementation of the experimental method are presented, as well as the signal processing procedure and data analysis. Conclusions are drawn concerning the specific visco-elastic behavior of mechanically relaxing materials in a porous morphology.

Mots clés: porous; viscoelastic; temperature; relaxation

Domaines: Acoustique [physics.class-ph]

Christ Glorieux, Jan Descheemaeker, Jean-Philippe Groby, Laurens Boeckx, Poonam Khurana. Temperature dependence of elasticity of poro-elastic layer. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00811068⟩