TY  - JOUR
AU  - Vlasie, Valentina 
AU  - Rousseau, Martine 
PY  - 2005
TI  - Non Destructive Tests of Structural Bonds by Guided Ultrasonic Waves: Effect of a Surface Pretreatment or a Localized Defect
JF  - American Journal of Applied Sciences
VL  - 2
IS  - 3
DO  - 10.3844/ajassp.2005.739.745
UR  - https://thescipub.com/abstract/ajassp.2005.739.745
AB  - The aim of this study was to propose a non destructive method to test the mechanical quality
of a bond aluminium/epoxy/aluminium. Thus, for each aluminium/epoxy interface, an intermediate
interface 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 free
energy (the surface tension). This parameter appears in the jump conditions of stresses and
displacements at each aluminium/epoxy interface. So, it influences the ultrasonic waves propagation
and particularly the guided modes of the tri-layer structure. The results show that the surface free
energy does not arise at normal angle of propagation, whereas near the Rayleigh angle, the behaviour
of the A0 and S0 Lamb modes varies strongly according to its value. Such a modelling seems well
adapted to take into account the pre-treatments of the aluminium plates or some localized interface
defects.