2503 Bolted Joint Monitoring with BOCDA system

Abstract

Structural health monitoring (SHM) system using optical fiber sensor is powerful solution to reduced maintenance cost and structural weight. Especially, in order to monitor large area structural health monitoring, the Brillion optical correlation domain analysis (BOCDA) method is most compatible method because of its long-range measurement, high spatial resolution, and high-speed strain sampling. In this paper, the authors report subcomponents test result, which is distribution strain measurement with 4.5mm spatial resolution BOCDA system. The test article is simulate airplane critical structural portion such as weight-lightened portion and bolted joint portion. The stress concentration and missing bolts can be detected with high spatial resolution BOCDA by strain distribution change.