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Abstract
The present work investigates the durability of two commercial epoxy adhesives nondestructively using ultrasonic reflection measurements from the interfacial region between the adhesive and the adherend. This method, which is primarily sensitive to the interfacial properties, employs a new specimen geometry that overcomes the drawbacks of the conventional closed adhesive sandwich. The interfacial region was modeled using the spring boundary conditions. The normal and tangential spring constants were determined, as a function of degradation, from normal-incidence longitudinal and shear-wave measurements. Obliquely incident shear-wave measurements were also performed using a newly developed dual-element PVDF transducer. An efficient angular spectrum approach was developed to model the oblique-incidence measurement system, and the predictions of the model were compared with measurements for various levels of degradation.
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