It is known that failure of adhesive joints can occur either in the bulk region of an adhesive layer (cohesive mode) or along an interface between the adhesive and an adherent (interfacial or adhesion mode). Properly manufactured adhesive joints fail in the cohesive mode, while after environmental degradation the failure mode becomes predominantly interfacial. Therefore we conclude that humid environments affect mostly the interfacial region of a joint. This indicates the importance of non-destructive assessment of interface properties. While methods of cohesive property evaluation have progressed significantly, much more effort is required to develop interface evaluation methods. A development of this type is undertaken in this work.
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