Abstract
The use of ultrasonic reflection coefficient measurements at both normal and oblique incidence for the detection and characterisation of oxide layers at the adhesive/adherend interface in adhesive joints has been investigated. The sensitivity of the measurements to the presence of the oxide layer is a strong function of the porosity of the layer. Tests have been carried out on joints with a minimal thickness oxide layer and with 50, 15 and 3.5 μm thick oxide layers, good fits to the experimental results being obtained using a transversely isotropic model of the oxide layer with porosities in the range 58-70%.
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