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8 October 1980 Surface And Near-Surface Defects In Glass-To-Glass Bonds
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Mechanical defects in glass-to--lass bonds have been characterized by optically measuring ultrasonic waves that travel along the interface. Such waves are ideal for the evaluation of interference-fit and adhesive bondline properties because significant interactions occur as the propagating waves sample bondline surface structure and because the effects of these interactions can be observed. Ultrasonic wave interactions with different types of defects at or near the boundary may be theoretically analyzed by considering a generalized model of the interface. In this paper, such theoretical predictions are compared with recent acoustooptical measurements of surface and near-surface defects. Specifically, the model developed by Murty and others consisting of two elastic solids separated by a Newtonian viscous liquid layer of thickness H 0 and viscosity coefficient n suggests several types of behavior if defects are present. First, surface defects cause interface wave scattering and attenuation. This attenuation has been interferometrically measured as a function of void diameter on several glass-to-glass boundaries° Second, sensitivity to near-surface defects has been observed by optically interacting with the internal interface wave fields on either side of such boundaries. Decreased sensitivity to buried defects has been noted as the ratio of substrate densities decreases. Optical measurements and analytical interface wave behavior are compared for both of these cases.
© (1980) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Richard O. Claus "Surface And Near-Surface Defects In Glass-To-Glass Bonds", Proc. SPIE 0250, Optomechanical Systems Design, (8 October 1980);

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