Non Destructive Tests of Structural Bonds by Guided Ultrasonic Waves: Effect of a Surface Pretreatment or a Localized Defect | Science Publications

American Journal of Applied Sciences

Martine Rousseau¹  Valentina Vlasie¹ 

关键词: Ultrasonic Waves;    Adhesion;    Interface Model;    Surface Free Energy;   

DOI  :  10.3844/ajassp.2005.739.745

学科分类：自然科学（综合）

来源: Science Publications

【 摘 要 】

The aim of this study was to propose a non destructive method to test the mechanical qualityof a bond aluminium/epoxy/aluminium. Thus, for each aluminium/epoxy interface, an intermediateinterface modelling between a simple geometrical interface and an interphase (3D material medium),i.e. a 2D material medium. In order to describe the surface stresses, we introduce the surface freeenergy (the surface tension). This parameter appears in the jump conditions of stresses anddisplacements at each aluminium/epoxy interface. So, it influences the ultrasonic waves propagationand particularly the guided modes of the tri-layer structure. The results show that the surface freeenergy does not arise at normal angle of propagation, whereas near the Rayleigh angle, the behaviourof the A₀ and S₀ Lamb modes varies strongly according to its value. Such a modelling seems welladapted to take into account the pre-treatments of the aluminium plates or some localized interfacedefects.

【 授权许可】

Unknown