Analysis of second-harmonic generation of Lamb waves propagating in layered planar structures with imperfect interfaces

Under second-order perturbation the modal analysis approach for waveguide excitation is used to investigate the generation of second harmonics of Lamb waves propagating in layered planar structures with imperfect interfaces. The imperfect interfaces of layered structures are characterized by the well-known finite interfacial stiffness technique. The analytical results clearly indicate that the efficiency of generation of second harmonics by Lamb wave propagation is strongly dependent on the interfacial stiffness constants. This letter shows a potential that the interfacial properties of layered planar structures can sensitively be evaluated by the effect of second-harmonic generation of Lamb wave propagation. (c) 2006 American Institute of Physics.