title: Normalized stiffness ratios for mechanical characterization of isotropic acoustic foams.
abstract: This paper presents a method for the mechanical characterization of isotropic foams at low frequency. The objective of this study is to determine the Young's modulus, the Poisson's ratio, and the loss factor of commercially available foam plates. The method is applied on porous samples having square and circular sections. The main idea of this work is to perform quasi-static compression tests of a single foam sample followed by two juxtaposed samples having the same dimensions. The load and displacement measurements lead to a direct extraction of the elastic constants by means of normalized stiffness and normalized stiffness ratio which depend on Poisson's ratio and shape factor. The normalized stiffness is calculated by the finite element method for different Poisson ratios. The no-slip boundary conditions imposed by the loading rigid plates create interfaces with a complex strain distribution. Beforehand, compression tests were performed by means of a standard tensile machine in order to determine the appropriate pre-compression rate for quasi-static tests.
authors: LAUM, CNRS UMR 6613, Université du Maine, Avenue O. Messiaen, 72085 Le Mans, France.
authors: Sohbi
authors: S
authors: Sahraoui
authors: LAUM, CNRS UMR 6613, Université du Maine, Avenue O. Messiaen, 72085 Le Mans, France.
authors: Bruno
authors: B
authors: Brouard
authors: PCI, CNRS UMR 6120, Université du Maine, Avenue O. Messiaen, 72085 Le Mans, France.
authors: Lazhar
authors: L
authors: Benyahia
authors: CTTM, Centre de Transfert de Technologie, 20 rue Thalès de Milet, 72000, Le Mans, France.
authors: Damien
authors: D
authors: Parmentier
authors: LAUM, CNRS UMR 6613, Université du Maine, Avenue O. Messiaen, 72085 Le Mans, France.
authors: Alan
authors: A
authors: Geslain