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

Jean Ayodele Adessina (1) , Mohamed Hamdaoui (2) , Chao Xu (3) , El Mostafa Daya (2)

1 navier umr 8205 - Laboratoire Navier
2 LEM3 - Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux
3 NPU - Northwestern Polytechnical University [Xi'an]

The aim of this paper is to present a finite element model based on first 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 finite element model and used to study damping and rigidity of a laminated glass configuration with a multi-layered visco-elastic core composed of acoustic PVB and PVB. It is shown that the rigidity index of the structure (defined as the adimensionalized inverse of the maximal transverse displacement under a static load) evolves linearly with the viscoelastic layers’ thicknesses and quadratically versus elastic layer’s thickness. The first 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.

Domaines: Sciences de l'ingénieur [physics]

Jean Ayodele Adessina, Mohamed Hamdaoui, Chao Xu, El Mostafa Daya. Damping properties of bi-dimensional sandwich structures with multi-layered frequency-dependent visco-elastic cores. Composite Structures, 2016, 154, pp.334-343. ⟨10.1016/j.compstruct.2016.07.056⟩. ⟨hal-03232790⟩