Ultrasonic Evaluation of Interphasial Properties in Adhesive Joints
The mechanical properties of adhesive joints depend on: 1) the bulk (cohesive) properties of the adhesive such as type of adhesive, degree of cure, porosity, et cetera and 2) the interphasial properties of the bond between the adhesive and the adherends. While several techniques have been developed for nondestructive evaluation of cohesive properties of the adhesive, the assessment of interphase properties is more complicated. It has been previously proposed  that an ultrasonic wave that produces shear stresses on the interphase is sensitive to its properties. This may be achieved by utilization of interface waves [1,2] or guided waves in the bonded plates [3,4,5]. Another possibility is the use of obliquely incident ultrasonic waves for interphase evaluation, analyzing signals in time or frequency domains [6,7,8].
KeywordsTransverse Wave Reflection Coefficient Adhesive Bond Lamb Wave Adhesive Joint
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