Strain Measurement on Cracks Using Fiber Bragg Gratings for Use in Aircraft Composite Skin Repairs
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Open AccessArticleStrain Measurement on Cracks Using Fiber Bragg Gratings for Use in Aircraft Composite Skin Repairs byAris A. Ikiades Physics Department, University of Ioannina, 45110 Ioannina, GreeceAerospace 2020, 7(9), 138; https://doi.org/10.3390/aerospace7090138 (registering DOI)Received: 5 July 2020 / Revised: 18 September 2020 / Accepted: 21 September 2020 / Published: 22 September 2020(This article belongs to the Special Issue Optical and Fiber Optical Sensors for Aerospace Applications)Download PDFCite This PaperAbstractFiber Bragg grating (FBG) sensors have been widely used for measurements of strain and temperature in a host of different applications, including aerospace in composite wings, fuselage structures, and other critical components. Here, we report on a method to measure highly localized intense stress fields, generated at the initialization point of a crack, or crack-tip, using Fiber Bragg Gratings (FBG) inscribed in highly photosensitive hydrogenated germanium and boron co-doped fiber. From the spectral characteristics of short and long FBGs, bonded on a test aluminum coupon with a crack, which simulated damaged skins of an aircraft, the local stresses near the cracks were measured and assessed. As a case study, bespoke composite repair patches were designed and bonded on a coupon, incorporating a number of gratings to monitor the stress distribution with applied force in the composite patch, near the crack.Keywords: fiber optic sensors; fiber Bragg Gratings; smart patches; crack propagation; aerospace fiber optic sensors; fiber Bragg Gratings; smart patches; crack propagation; aerospaceThis is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly citedShare and CiteMDPI and ACS StyleIkiades, A.A. Strain Measurement on Cracks Using Fiber Bragg Gratings for Use in Aircraft Composite Skin Repairs. Aerospace 2020, 7, 138.
AMA StyleIkiades AA. Strain Measurement on Cracks Using Fiber Bragg Gratings for Use in Aircraft Composite Skin Repairs. Aerospace. 2020; 7(9):138.
Chicago/Turabian StyleIkiades, Aris A. 2020. "Strain Measurement on Cracks Using Fiber Bragg Gratings for Use in Aircraft Composite Skin Repairs." Aerospace 7, no. 9: 138.
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» Reference: Aerospace 2020, Vol. 7, Page 138
This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement Nº 768737