Modelling non-uniform strain distributions in aerospace composites using fibre Bragg gratings

Modelling non-uniform strain distributions in aerospace composites using fibre Bragg gratings

Rajabzadeh, Aydin (TU Delft Signal Processing Systems)
Groves, R.M. (TU Delft Structural Integrity & Composites)
Hendriks, R.C. (TU Delft Signal Processing Systems)
Heusdens, R. (TU Delft Signal Processing Systems)

Chung, Y. (editor)
Jin, W. (editor)
Lee, B. (editor)
Canning, J. (editor)
Nakamura, K. (editor)
Yuan, L. (editor)

2017

In this paper the behaviour of fibre Bragg grating (FBG) sensors under non-uniform strain distributions was analysed. Using the fundamental matrix approach, the length of the FBG sensor was discretised, with each segment undergoing different strain values. FBG sensors that are embedded inside composites, also undergo such non-uniform strain distributions, when located in the vicinity of failures such as matrix cracks or delamination of layers. This non-uniform strain distribution was created in an experimental setup. Finite element analysis was used to analytically model the strain distribution along the FBG length. The measured FBG outputs were then compared to the simulated results. There was a high amplitude correlation between the results of the measured and the simulated reflection spectra with a maximum of 0.97 among all cases.

FBG simulation
Fibre Bragg gratings
Fundamental matrix method
Non-uniform strain
Reflection spectra
Structural health monitoring (SHM)

http://resolver.tudelft.nl/uuid:78817e62-824c-4cdf-b10c-6c2f5f54f2d3

https://doi.org/10.1117/12.2265376

SPIE, Bellingham, WA

9781510610910

Proceedings - 25th International Conference on Optical Fiber Sensors

25th International Conference on Optical Fiber Sensors, 2017-04-24 → 2017-04-28, Jeju, Korea, Republic of

Proceedings of SPIE, 0277-786X, 10323

Institutional Repository

conference paper

© 2017 Aydin Rajabzadeh, R.M. Groves, R.C. Hendriks, R. Heusdens