Lamb mode separation at the plate edge by applying the orthogonality relation

摘要

Lamb modes are widely used for non-destructive evaluation of plate-like structures and simple interpretation procedures for the analysis of the monitored structures are needed. In this study we apply the orthogonality relation based method for post-processing Finite Element (FE) and experimental measurements in order to separate Lamb modes at a plate edge. The method uses through-thickness displacement data of the plate edge which allows determining the time-domain amplitudes of various scattered modes. Overlapping wavepackets of Lamb modes at a plate edge are simulated by using the incident SO mode in a plate with a notch. The influences of the errors in practical measurements on the extraction procedure have also been studied.