We have found excellent agreement with theoretical model of plate wave spectrum. Work is continuing to assess implications for materials inspection and to construct an inspection protocol. Ultrasonic beam interaction in curved and planar layered structures. The reflected field of finite acoustic beams and their interaction with fluid-loaded cylindrical shells is being studied experimentally and theoretically. Interaction of specular and nonspecular fields produces interference and strong amplitude modulation in the detected voltage.
Application is to characterization of bonded viscoelastic layers in naval superstructure.
Theoretical and experimental investigation of effects of microstructure on elastic guided waves. Rayleigh wave dispersion in presence of vertical lamination reported. Calculations have been extended to continuous fiber composites in plate geometries, which demonstrate combined effects of micro and macro-structural dispersion. Samples have been measured and results compare well with first-order theory. Three-dimensional braided composite characterization with plate waves.