Smart-Patch Repair Engineering of Aging Aircraft and Spacecraft Structures

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The repair engineering of cracked aircraft and spacecraft structures is needed to extend the service life of aging aircraft and spacecraft. In this research project, the repair engineering of the structural panels using smart patches, i.e. composite patches with sensors and actuators, was investigated to accomplish a high level of safety of repaired aircraft and spacecraft. The main results are summarized as follows :1. Based on a three-dimensional combined BEM/FEM, the numerical simulation method of damage evolution behavior in repaired structural panels was presented.2. The strain measuring sensor system using fiber Bragg grating (FBG) sensors installed on the patch surface was developed, and the method for identifying the locations and shapes of damage fronts in repaired structural panels was presented.3. The enhancement of patching efficiency due to the activation of piezoelectric actuators in smart patches was examined, and the retardation of damage evolution in repaired structural panels was realized.4. The issues in practical use of the smart-patch repair engineering were considered, and the feasibility study was made.