Lamb wave techniques are emerging as one of the most effective methods for damage detection in aeronautic structures. Lamb waves are guided waves that exist in thin wall structures with free boundaries. For a plate having a thickness of the order of a wavelength or so, surface Rayleigh waves can degenerate into Lamb waves. These waves can travel over large distances with little attenuation thus allowing the inspection of large plate-like structures with little loos of energy. The problem arrives with their dispersive nature. That is, for a given frequency multiple modes can exist, making defect identification difficult. The analytical dispersion curves give us an idea of the various existing modes and its velocities for each frequency of excitation. Therefore, it becomes necessary to choose the optimal frequency excitation, and the appropriate actuator location, to obtain the modes more adequate to defects detection. A finite element program can help in this task.
Selective excitation of Lamb wave modes in thin aluminium plates using bonded piezoceramics. FEM modelling and measurements
Selektive Anregung von Plattenwellenmoden in dünnen Aluminiumblechen mittels geklebter Piezokeramik. FEM-Modellierung und Messung
2006
7 Seiten, 7 Bilder, 5 Quellen
Conference paper
Storage medium
English
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