Experimental Evaluation of Repair Efficiency of Composite Patching by ESPI

Abstract

In this paper, the electronic speckle pattern interferometry (ESPI) technique was first used to investigate repair efficiency of patching by using composite materials on aluminum alloy plates containing a central crack. The effect of single-sided and double-sided patchings with same total thickness and four different fiber orientations of the patchings was discussed. A self-developed computer program for analyzing mode I stress intensity factor (SIF), K1 was performed to evaluate the repair efficiency. To verify the correctness of the experimental results, recontruction technique was employed. Well-matched condition between the experimentally obtained and reconstructed fringes indicates the correctness of the experimental results.

OS3-2-3 Nondestructive Analysis of Composite Plates Containing Defects

“…Wang, et al [6] adopted the vacuum technique to perform the nondestructive evaluation of composite plates containing various sizes and shapes of defects located at different depths. Wang and Chiou [7] first used the ESPI to investigate the repair efficiency of composite patching on aluminum alloy plates containing a central crack. In contrast to the traditional ESPI, Wang, et al [8] introduced amplitude fluctuation (AF) ESPI to significantly improve the contrast and increase the resolution of the traditional ESPI fringe pattern.…”