Motivated by a reduction of maintenance costs and the enabling of new design criteria aircraft manufacturers are developing structure-integrated damage sensor systems. In this paper the application of Fibre Bragg Grating Sensors (FBGS) for damage detection is investigated. Acting as an optical strain sensor, FBGS will detect a change in strain distribution influenced by a growing crack or delamination in the monitored structure. Making the step to determine damage size and location from a measured strain distribution requires exact knowledge of the structural behaviour. In FEM-calculations the optimum positions for applying FBGS can be identified so that the sensors do not break in case of a crack but also produce a clearly evaluable strain signal. In this work, samples close to real aircraft structures were instrumented with a strategically arranged grid of FBGS to ensure maximum information with a minimum of sensors. Measurements were performed during and after an impact test. It could be demonstrated that the resulting damage is detectable by the sensor system. Appropriate data interpretation allows for the conclusion on damage size and location.
Damage detection using Fibre Bragg Grating Sensors
Schadensnachweis mit Faser-Bragg-Gitter-Sensoren
2006
8 Seiten, 9 Bilder, 5 Quellen
Conference paper
Storage medium
English
Multi-functional fibre Bragg grating sensors for fatigue crack detection in metallic structures
SAGE Publications | 2006
|