2) MATELYS-Acoustique &V ibrations, 20/24 rue Robert Desnos, 69120 Va ulx-en-Velin, France Summary The combined mechanical and acoustic properties of auxetic (negative Poisson's ratio)foams are described both from anumerical and experimental point of view. Samples of open cell PU-PEfoams with negative Poisson's ratio are produced using adedicated manufacturing process, and subjected to tensile quasi static and cyclic loading, as well as sound absorption measurements based on ISO 10-534-2 Standard. Ahomogenization model based on the Biot'stheory is also derivedtocalculate the poroelastic parameters of the foam. The experimental and numerical results are compared and commented to provide explanations regarding the unusual acoustic absorption of these porous materials. PACS no. 43.40.+r 266 ©S.Hirzel Verlag · EAA Chekkal et al.:V ibro-Acoustic Properties of Open Cell Foam ACTA ACUSTICA UNITED WITH ACUSTICA Vol. 96 (2010)
Auxetic foams have raised some interest in noise and vibration control applications as they showed unusual acoustic properties compared to conventional ones, particularly at low frequencies. Auxetic foams are porous materials with a negative Poisson's ratio. They expand in all directions when only pulled in one. In this paper, the acoustic properties of auxetic foams are described both from a numerical and experimental point of view. The acoustic absorption properties of both auxetic and conventional foam samples were measured using a two-microphone impedance tube to provide a comparison between the two types of cellular solids. The acoustical properties of auxetic foams are discussed in terms of the dynamic parameters. A numerical model based on Biot's theory is derived in which the dynamic coefficients of foams are evaluated. Results are compared and commented to provide explanations on the unusual acoustical behaviour of auxetic foams.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.