Abstract
In this paper, the vibration behaviors of bonded structures were experimentally investigated by incorporating amplitude fluctuation electronic speckle pattern interferometry (AF-ESPI) and modal testing technique, A special casting procedure was employed to manufacture the naturally bonded structures to avoid the influence resulted from the adhesive. Vibration characteristics of bonded structures with different geometrical combinations of constituent adherends and the influence of presence of an interfacial crack were clarified from the distinguished vibration behaviors.