Assessments of shear core effects on sound transmission loss through sandwich panels using a two-scale approach

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.