Damping properties of bi-dimensional sandwich structures with multi-layered frequency-dependent visco-elastic cores

ADESSINA ; HAMDAOUI ; XU ; DAYA

Type de document
ARTICLE A COMITE DE LECTURE REPERTORIE DANS BDI (ACL)
Langue
anglais
Auteur
ADESSINA ; HAMDAOUI ; XU ; DAYA
Résumé / Abstract
The aim of this paper is to present a ï¬nite element model based on ï¬rst order shear theory (zig-zag approach) to compute the damping characteristics of sandwich structures with multi-layered frequency-dependent viscoelastic cores. The model is validated versus a layerwise ï¬nite element model and used to study damping and rigidity of a laminated glass conï¬guration with a multi-layered visco-elastic core composed of acoustic PVB and PVB. It is shown that the rigidity index of the structure (deï¬ned as the adimensionalized inverse of the maximal transverse displacement under a static load) evolves linearly with the viscoelastic layersâ¤? thicknesses and quadratically versus elastic layerâ¤?s thickness. The ï¬rst mode damping and resonant frequency show a non monotonous behaviour. In particular, the existence of an optimal faces thickness for damping is shown while a quadratic behaviour of frequency versus acoustic PVB layer thickness is reported.
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