Corrosion Depth Monitoring of Hole-Edge Based on Lamb wave

This study proposed a novel method using Lamb wave to detect corrosion depth at the hole-edge of plate-like structure. An experimental procedure with a hexagon layout using 6 piezoelectric sensors (PZTs) was applied. The A0 mode of the Lamb wave was selected to detect depth-loss damage, and the amplitude of A0 mode gradually decreases with the increasing of corrosion depth. The simulation results are consistent with the real damage pictures, which confirms the effectiveness of the proposed method. The results show that A0 mode of Lamb wave can be used to identify corrosion depth damage at the hole-edge of plate-like structure.