Assessments of shear core effects on sound transmission loss through sandwich panels using a two-scale approach. (1st April 2017)

• Record Type: Journal Article
• Authors: Zergoune, Z.; Ichchou, M.N.; Bareille, O.; Harras, B.; Benamar, R.; Troclet, B.
• Is Part Of: Computers & structures. Volume 182(2017)
• Page Start: 227
• Page End: 237
• Publication Date: 2017-04-01
• Subjects: Sandwich panels -- Sound transmission loss -- Transition frequency -- Honeycomb core -- Dispersion relation -- Periodic structures; Structural engineering -- Data processing -- Periodicals; Electronic data processing -- Structures, Theory of -- Periodicals; 624.171
• DOI: 10.1016/j.compstruc.2016.11.017
• Languages: English
• ISSNs: 0045-7949

Abstract

Highlights: Meso-macro approach with reduction process is proposed for modeling the flexural vibroacoustic behavior of sandwich panels. Expression of the sound transmission loss accounted the core shear effect is derived. Parametric analyses of hexagonal and other core configurations are provided. Effects of the bending-shear transition frequency on the sound transmission loss are proven. Effects of the core topology on the sound transmission loss at the mid frequencies are confirmed. Abstract: The present work proposes a modeling strategy based on a two-scale approach to deal with the flexural vibroacoustic behavior of sandwich panels notably in the low-mid frequency range. The vibroacoustic indicators of interest here are primarily the sound transmission loss and the bending-shear transition frequency of the sandwich panels. The stated indicators depend mainly on the geometrical and mechanical parameters of the studied cases. The parametric analyses, therefore, bring out the effects of the different meso-scale parameters on the macro-scale responses of the sandwich panels by performing three-dimensional model of a representative elementary cell. The two-scale approach is mainly based on a numerical method known as the wave finite element method. In the developed approach, an expression of the sound transmission loss was derived wherein the shear core effect of sandwich panels has been included. The obtained results were compared with two models and experimental data to check the accuracy of the prediction and showed a good agreement.