Modeling and numerical study of the influence of imperfect interface properties on the reflectance function for anisotropic multilayered structures

Abstract

The demand for the development of non-destructive techniques aiming to assess the reliability of adhesively bonded structures has greatly increased these recent years. The multilayered plates investigated can suffer from different defects, such as delaminations, inclusions and microcracks at interfacial areas. The aim of this paper is to study the effect of imperfect interfaces on the wave propagation in multilayered structures that represent the typical architecture of components present in several industrial fields. This study is based on the calculation of both the reflectance function and the guided waves dispersion curves for an anisotropic multilayer where two metallic layers are bonded together by an adhesive layer made of an epoxy resin. Comparisons were performed in order to evaluate numerically the influence of several properties of the adhesive layer on the resonance modes of the multilayer. In addition, an imperfect porous interface layer model is implemented in order to simulate different adherence qualities between the metallic layers.