Damping properties of bi-dimensional sandwich structures with multi-layered frequency-dependent visco-elastic cores. (15th October 2016)

• Record Type: Journal Article
• Authors: Adessina, Ayodele; Hamdaoui, Mohamed; Xu, Chao; Daya, El Mostafa
• Is Part Of: Composite structures. Volume 154(2016)
• Page Start: 334
• Page End: 343
• Publication Date: 2016-10-15
• Subjects: Sandwich beam -- Damping -- Rigidity -- Multilayered viscoelatic core -- Laminated glass; Composite construction -- Periodicals; Composites -- Périodiques; 624.18
• DOI: 10.1016/j.compstruct.2016.07.056
• Languages: English
• ISSNs: 0263-8223

Abstract

Abstract: 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.