Beschreibung:
<jats:p>A complete description of the vibro-acoustical behavior of a poroelastic material requires the knowledge of both geometrical quantities, related to the structure of the fluid-filled pores to account the sound propagation within them, and mechanical parameters (i.e. Young Modulus, Poisson's ratio, and loss factor) in order to model the wave propagation through the elastic structure constituting its skeleton. Because the nonlinear nature of poroelastic media, those mechanical properties are shown depending on static preload and dynamic strain applied to them. In the present work a well established quasi-static method, based on the measurement of mechanical impedance and the use of adequate polynomial relations, has been used to determine the dependence of the mechanical properties on the applied deformations. Furthermore, tests have been also carried out in a vacuum chamber in order to evaluate the real contribution of the filling fluid on the total vibro-acoustical response of the material.</jats:p>