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Materials 2017, 10(6), 588; doi:10.3390/ma10060588

Investigation on Characteristic Variation of the FBG Spectrum with Crack Propagation in Aluminum Plate Structures

1
School of Energy and Power Engineering, Beihang University, 37 Xueyuan Rd., Haidian Dist., Beijing 100191, China
2
School of Reliability and Systems Engineering, Beihang University, 37 Xueyuan Rd., Haidian Dist., Beijing 100191, China
3
Collaborative Innovation Centre for Advanced Aero-Engine, Beihang University, 37 Xueyuan Rd., Haidian Dist., Beijing 100191, China
*
Author to whom correspondence should be addressed.
Academic Editor: Shenfang Yuan
Received: 14 April 2017 / Revised: 15 May 2017 / Accepted: 23 May 2017 / Published: 27 May 2017
(This article belongs to the Special Issue Structural Health Monitoring for Aerospace Applications 2017)
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Abstract

In order to monitor the crack tip propagation of aluminum alloy, this study investigates the variation of the spectrum characteristics of a fiber Bragg grating (FBG), combined with an analysis of the spectrum simulation. The results identify the location of the subordinate peak as significantly associated with the strain distribution along the grating, corresponding to the different plastic zones ahead of the crack tip with various crack lengths. FBG sensors could observe monotonic and cyclic plastic zones ahead of the crack tip, with the quadratic strain distribution along the grating at the crack tip-FBG distance of 1.2 and 0.7 mm, respectively. FBG sensors could examine the process zones ahead of the crack tip with the cubic strain distribution along the grating at the crack tip-FBG distance of 0.5 mm. The spectrum oscillation occurs as the crack approaches the FBG where the highly heterogeneous strain is distributed. Another idea is to use a finite element method (FEM), together with a T-matrix method, to analyze the reflection intensity spectra of FBG sensors for various crack sizes. The described crack propagation detection system may apply in structural health monitoring. View Full-Text
Keywords: FBG sensor; reflection intensity spectra; T-matrix method FBG sensor; reflection intensity spectra; T-matrix method
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This 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 cited. (CC BY 4.0).

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Jin, B.; Zhang, W.; Zhang, M.; Ren, F.; Dai, W.; Wang, Y. Investigation on Characteristic Variation of the FBG Spectrum with Crack Propagation in Aluminum Plate Structures. Materials 2017, 10, 588.

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