Damage Imaging in Lamb Wave-Based Inspection of Adhesive Joints

Destructive testing is not free of disadvantages, it is, in general, a high-cost solution and cannot usually be applied to existing structures. [...]different non-destructive testing (NDT) methods have been adopted for the inspection of adhesive joints [5] including ultrasonics [6,7], thermography [8], radiography [7], digital image correlation [9,10], or electromechanical impedance spectroscopy [11]. According to the visual assessment, the clearness of the WRMS maps increased with the increase in the time window. [...]internal defects were the most difficult to identify because of the local characterization of occurring wave phenomena. 6. Based on this indicator, it was proven that the largest value of the time window obtained damage maps with the highest clearness. [...]it was possible to determine the range of the optimal value of the weighting factor and to quantify the defect areas.