12D-5 NDE of Adhesive Joints Using V(x,t) Data

In this paper we examine the NDE problem of the detection of bonding, verses disbonding, at the interfaces of a typical bonded plate. By using a wide angle focused transducers results are obtained in the space-time domain (V(x,t) data). This setup generates a variety of Lamb modes within the plate, provides leaky wave data spread throughout the time space domain, and eliminates the time domain overlap problems of waveforms from normal incidence testing method. Directly comparing the V(x,t) data additional leaky mode reflections are observed, where the period of these reflections if found to increase linearly with the thickness of the adhesive layer. Additionally we investigate the K-F map (V(k,f) data) generated from the 2D Fourier transform of the V(x,t) data, and briefly compare the expected theoretical results with the experimental results for both V(x,t) data, and K-F maps.