Dynamic Response of Soft Core Sandwich Beams with Metal-Graphene Nanocomposite Skins

M A R Loja

doi:10.1155/2017/7842413

Abstract

Sandwich structures are able to provide enhanced strength, stiffness, and lightweight characteristics, thus contributing to an improved overall structural response. To this sandwich configuration one may associate through-thickness graded core material properties and homogeneous or graded properties nanocomposite skins. These tailor-made possibilities may provide alternative design solutions to specific problem requisites. This work aims to address these possibilities, considering to this purpose a package of three beam layerwise models based on different shear deformation theories, implemented through Kriging-based finite elements. The viscoelastic behaviour of the sandwich core is modelled using the complex method and the dynamic problem is solved in the frequency domain. A set of case studies illustrates the performance of the models.

Highlights

Sandwich structural configurations are widely used in situation where an increased strength of the structure and bending stiffness and of its buckling loads and fundamental frequencies is required
Arvin et al [6] studied the frequency response of sandwich beams with composite faces and viscoelastic cores
A schematic representation of this sandwich configuration is presented in Figure 1, where the viscoelastic core is identified by the superscript V and the outer layers, by e1, e2, as they are assumed to behave elastically

Summary

Introduction

Sandwich structural configurations are widely used in situation where an increased strength of the structure and bending stiffness and of its buckling loads and fundamental frequencies is required When these structures have soft and lightweight cores they confer simultaneously to the global sandwich structure a viscoelastically damped behaviour, which is very useful in several science and engineering applications, to attenuate structural vibration and noise, and to enhance the fatigue endurance and impact resistance. Studies upon these effects and on the influence of some structural parameters were carried out recently by Wan et al [1] and by Shen et al [2].

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Conclusion