Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 52, Issue -, Pages 38-44Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2013.05.005
Keywords
Residual/internal stress; Smart materials; Cure behavior; Non-destructive testing
Funding
- European Union
- European Regional Development Fund
- Wallonia (Mediatic project)
- Interuniversity Attraction Pole of the BelSPo photonics@be
- F.R.S.-FNRS
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This work presents a novel technique known as polarization dependent loss (PDL) towards the accurate detection of small transverse strains using optical fiber Bragg gratings. The fundamentals of PDL are explained and the benefits discussed. A cure cycle of a cross-ply composite with embedded fibers was monitored using this PDL technique and the data from the experiments are discussed. As shown, differences in transverse strain of up to 500 mu epsilon will go unnoticed with normal read-out equipment (1 pm resolution), while PDL is capable of accurately detecting much smaller values. Using PDL, it was possible to detect transverse strain build-up due to matrix polymerization, which was found to cause 60 mu epsilon of difference in transverse strains. A method was proposed combining the benefits of both PDL and amplitude techniques to achieve superior resolution in FBG read-out. (C) 2013 Elsevier Ltd. All rights reserved.
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