Abstract
Utilization of specific Lamb wave modes with special cross-sectional wave structures is proposed for the detection of interfacial weakness between an adhesive and adherent. Such an approach is based on plate wave behavior in a three-layered medium with imperfections on the individual interfaces. Selection of appropriate modes and frequencies for adhesion weakness detection is obtained by numerical analysis of the dispersion relations and comparisons of the dispersive curves for perfect, welded and imperfect, smooth boundary conditions. The inspection parameters were evaluated by an analysis of displacement, stress, and power distributions across the three-layered asymmetric adhesive structure. Special selection criteria are proposed. Utilization of dispersive curves do not always provide expected increased sensitivity as in the cross-sectional field distribution approach.
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