Ultrasonic nondestructive evaluation (NDE) of adhesively bonded joints. Natural frequencies and complex mode shapes
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In this paper uniaxial, steady-state, time harmonic wave propagation in an adhesively bonded joint consisting of two aluminum adherends joined by a linearly viscoelastic layer is studied in considerable detail. An exact solution for the transmitted field, H*(), is derived. The natural frequencies of the joint are studied as a function of normalized adhesive thickness, and from the viewpoint of magnitude and phase spectroscopy NDE, the sensitivity of the transmitted field to bond parameters is examined. In order to explain the behavior of the transfer function, the complex mode shapes of the joint have been studied. Finally, measurements of H*() are reported; a good agreement between theory and experiment was noted.