On the Excitability of Second Harmonic Lamb Waves in Isotropic Plates

Abstract

Recent research uses second harmonic waves caused by material nonlinearity to characterize fatigue damage in its early stages. This research investigates this second harmonic Lamb wave generation analytically, using a solution derived by De Lima, in order to provide infonnation on the efficient generation and detection of a second harmonic amplitude for improved signal-to-noise ratio in measurements. Symmetry properties of the second harmonic wave are also clarified, since the published literature is contradictory.