RECENT DEVELOPMENT OF STRUCTURAL HEALTH MONITORING TECHNOLOGIES FOR AIRCRAFT COMPOSITE STRUCTURES IN JAPAN
Nobuo Takeda
Department of Advanced Energy, Graduate School of Frontier Sciences
The University of Tokyo
Mail Box 302, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan
URL: http://www.smart.k.u-tokyo.ac.jp, E-mail: takeda@smart.k.u-tokyo.ac.jp
In Japan, we have been developing optical fiber based SHM technologies in recent national industry-university collaboration programs, and the author has been the project leader. After some important fundamental developments, such as small-diameter optical fiber sensors for embedment in CFRP structures without introducing any deterioration (Fig.1), we are now applying to sub-component structure prototypes. This presentation provides some recent development of optical fiber based SHM technologies for near-future aircraft composite structures. The topic includes:
(1) Development of small-diameter optical fibers and FBG sensors
(2) Damage detection in composites by FBG sensors
(3) Impact damage detection in stiffened composite fuserage structure (Fig.2)
(4) PZT/FBG hybrid sensing system for bond-line monitoring in CFRP box structures
(5) Highly reliable advanced grid structures (HRAGS)
(6) Distributed strain sensing using Brillouin optical correlation domain analysis
(7) Real-time on-board strain monitoring of composite tanks in reusable launch vehicles
Fig.1. Conventional and small-diameter optical fibers embedded in a CFRP lamina and small-diameter FBG sensors
Fig.2. Final assembly of the Damage Detection and Suppression Demonstrator
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