Experimental Determination of the Variation in Shear Modulus Through the Interfacial Zone of an Adhesive

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Abstract
A gradient in shear modulus occurs in the interfacial accommodation zone (IAZ) of FM 73, a commercial film adhesive, bonded to aluminum. Such determination has been made by means of ultrasonic Rayleigh waves (surface waves) generated on successively exposed layers of the adhesive throughout the bondline region. Experimental Rayleigh wave apparatus is described which has been used to obtain the shear-modulus gradient in FM 73. Various substrate surface treatments and adhesive cure times were considered, demonstrating that the variation of shear modulus in the IAZ of FM 73 is independent of substrate treatment or cure time. Preparing the aluminum substrate with BAC results in an IAZ of greater extent than occurs with the other two treatments. Cure time does not affect the range of the IAZ, but does influence somewhat the shear modulus of the adhesive beyond the IAZ.

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