Abstract
A small 2 nun wide, 25 mm long peel specimen is described which has been used to obtain the adhesive fracture energy for specimens comprising a toughened epoxy adhesive with aluminium adherends. The specimen is conveniently made from the unpulled ends of existing floating roller peel test specimens used by the aerospace industry as part of the routine quality control procedures. Specimens were prepared with the thinner adherend polished down to give specimens with a range of different adherend thicknesses, with failure occurring at or near the interface between adhesive and the adherend oxide. Estimates of adhesive fracture energy for failure in this region were made by using recent analytical methods. Measurements are also reported on the force required to bend thin strips with the same dimensions as those used for the peeling experiments. These served as a simulation of that part of the peel load due to energy dissipation in the peeling adherend arm, and the results were compared with predictions. The influence of peel specimen width on measured peeling load is also reported.
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