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Since delaminations of composite laminates are usually invisible or difficult to be detected by visual inspections, the delamination causes low reliability of primary structures. In order to improve the low reliability, automatic systems for delamination identifications in-service are desired. The present study employs an electric resistance change method for detections of the delaminations. Although the method is effective to monitor the delamination cracks, the method requires many experiments to solve inverse problems. Since the experiment cost is high, an analytical method for preparation of the data sets of the electric resistance changes is desired. In practical delamination, however, usually includes a matrix cracking. In the present study, therefore, the effect of the matrix cracking on the electric resistance changes between the electrodes is investigated with FEM analyses. As a result, it can be concluded that the simple calculations using a straight delamination crack model are enough for obtaining the data set of electric resistance changes to calculate the response surfaces.

Analysis of the Effect of the Configuration of the Delamination Crack on Delamination Monitoring with Electric Resistance Change Method