Delamination detection in carbon fiber reinforced plastic cross-ply laminates using crack swarm inspection: Experimental verification

In the present paper, we investigated the experimental effectiveness of crack swarm inspection for delamination detection in cross-ply CFRP laminates. Electrodes of the test piece on the surface were made of silver paste, and electric potential changes before and after the damage were measured as true value data by the LCR meter. We also investigated the influence of electrode interval on estimation accuracy by changing the width and the number of the electrodes installed on the test piece surface. As a result, it was confirmed that even in the case where the electrode interval is long, the delamination can be detected within the error range of 10 mm in the location estimation. In addition, the accuracy of the length estimation became particularly high by shortening the electrode interval, and in the case of electrode interval of 4.5 mm, it was possible to detect within the error range of approximately 5 mm even in length estimation.