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), K 1 , 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.