Abstract
The variations in shear modulus occurring through the interfacial bond zone ( IBZ) of AF 453 adhesive bonded to aluminium have been determined. Acoustic surface (Rayleigh) waves at ultrasonic frequency were propagated along surfaces of the adhesive sequentially exposed from the bulk through the IBZ towards the bondline. The propagation speed of these sound waves over the adhesive surfaces was then used to obtain the shear modulus of the material at each layer. With AF 453 adhering to an aluminium substrate prepared according to an industrial standard surface treatment procedure, a linear variation was found for the shear modulos near the adhesive/ adherend interface, independent of cure time. (Cure temperature was that specified by the manufacturer). The range of the IBZ was larger for a longer than normal period of cure.
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