Damage Assessment in Advanced Composite Structures Using Embedded Fibre Bragg Grating Sensors

2007 ◽  
Vol 14 (3) ◽  
pp. 23-32
Author(s):  
Lau Kin Tak ◽  
Ling Hang Yin ◽  
Lam Pou Man
Keyword(s):  
Damage Assessment ◽  
Composite Structures ◽  
Bragg Grating ◽  
Fibre Bragg Grating ◽  
Advanced Composite

Embedded fibre Bragg grating sensors for non-uniform strain sensing in composite structures

2005 ◽  
Vol 16 (12) ◽  
pp. 2415-2424 ◽  
Author(s):  
Hang-yin Ling ◽  
Kin-tak Lau ◽  
Li Cheng ◽  
Kwok-wing Chow
Keyword(s):  
Composite Structures ◽  
Uniform Strain ◽  
Bragg Grating ◽  
Fibre Bragg Grating ◽  
Strain Sensing

scholarly journals Model of the Temperature Influence on Additively Manufactured Carbon Fibre Reinforced Polymer Samples with Embedded Fibre Bragg Grating Sensors

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 222
Author(s):  
Torkan Shafighfard ◽  
Magdalena Mieloszyk
Keyword(s):  
Numerical Simulation ◽  
Composite Structures ◽  
Thermal Loading ◽  
Elevated Temperatures ◽  
Mechanical Strain ◽  
Experimental Investigations ◽  
Bragg Grating ◽  
Fibre Bragg Grating ◽  
Reinforced Polymer ◽  
Fbg Sensors

This study investigates the thermo-mechanical behaviour of additively manufactured Carbon Fiber Reinforced Polymer (CFRP) with embedded Fibre Bragg Grating (FBG) sensors with respect to their feasibility for utilising them under thermal loading. This was conducted through the Finite Element Method (FEM) inside an ABAQUS environment. Numerical simulation was complemented by several experimental investigations in order to verify the computational results achieved for the specimens exposed to thermal loading. FBG sensors, incorporated into the material by embedding technique, were employed to measure the strains of the samples subjected to elevated temperatures. It was shown that the strains given by numerical simulation were in good agreement with the experimental investigation except for a few errors due to the defects created within the layers during Additive Manufacturing (AM) process. It was concluded that the embedding FBG sensors were capable of identifying thermo-mechanical strain accurately for 3D-printed composite structures. Therefore, the findings of this article could be further developed for other types of material and loading conditions.

Fibre Bragg grating sensor applications for structural health monitoring

2018 ◽  
Vol 92 (3) ◽  
pp. 355-367
Author(s):  
Cansu Karatas ◽  
Boray Degerliyurt ◽  
Yavuz Yaman ◽  
Melin Sahin
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Composite Structures ◽  
Composite Beams ◽  
Strain Gauges ◽  
Bragg Grating ◽  
Fibre Bragg Grating ◽  
Content Type ◽  
Structural Health ◽  
Fbg Sensors

Purpose Structural health monitoring (SHM) has become an attractive subject in aerospace engineering field considering the opportunity to avoid catastrophic failures by detecting damage in advance and to reduce maintenance costs. Fibre Bragg Grating (FBG) sensors are denoted as one of the most promising sensors for SHM applications as they are lightweight, immune to electromagnetic effects and able to be embedded between the layers of composite structures. The purpose of this paper is to research on and demonstrate the feasibility of FBG sensors for SHM of composite structures. Design/methodology/approach Applications on thin composite beams intended for SHM studies are presented. The sensor system, which includes FBG sensors and related interrogator system, and manufacturing of the beams with embedded sensors, are detailed. Static tension and torsion tests are conducted to verify the effectiveness of the system. Strain analysis results obtained from the tests are compared with the ones obtained from the finite element analyses conducted using ABAQUS® software. In addition, the comparison between the data obtained from the FBG sensors and from the strain gauges is made by also considering the noise content. Finally, fatigue test under torsion load is conducted to observe the durability of FBG sensors. Findings The results demonstrated that FBG sensors are feasible for SHM of composite structures as the strain data are accurate and less noisy compared to that obtained from the strain gauges. Furthermore, the convenience of obtaining reliable data between the layers of a composite structure using embedded FBG sensors is observed. Practical implications Observing the advantages of the FBG sensors for strain measurement will promote using FBG sensors for damage detection related to the SHM applications. Originality/value This paper presents applications of FBG sensors on thin composite beams, which reveal the suitability of FBG sensors for SHM of lightweight composite structures.

An all-fibre multi-parameter sensor for composite structures based on a chirped fibre Bragg grating

2013 ◽  
Vol 21 (3) ◽  
Author(s):  
Y. Zhan ◽  
L. Li ◽  
F. Yang ◽  
K. Gu ◽  
H. Wu ◽  
...  
Keyword(s):  
Optical Fibre ◽  
Composite Structure ◽  
Composite Structures ◽  
Axial Stress ◽  
Bragg Grating ◽  
Fibre Bragg Grating ◽  
Long Period Grating ◽  
Temperature Resolution ◽  
Single Sensor ◽  
Theoretical Analyses

AbstractAn all-fibre multi-parameter sensor for composite structures based on a chirped optical fibre Bragg grating (CFBG) has been studied theoretically and experimentally. The principle of multi-parameters sensing with a single CFBG is based on that the centre wavelength and the FWHM (full width at half maximum) in the reflection spectrum of a CFBG vary linearly with the temperature and/or the axial stress. A wavelength matched optical fibre long period grating (LPG) and another wavelength matched reference CFBG (CFBGR) have been used to interrogate the signal of the sensor CFBG (CFBGS). The temperature and strain of the composite structure have been monitored real-time with one CFBG as a single sensor head. The temperature resolution of 0.12°C and the strain resolution of 1.1μɛ for a composite structure have been realized in experiments. The experiment results agree well with the theoretical analyses.

Prediction of Obsolete FBG Sensor Using ANN for Efficient and Robust Operation of SHM Systems

2013 ◽  
Vol 558 ◽  
pp. 546-553
Author(s):  
Gayan C. Kahandawa ◽  
Jayantha Ananda Epaarachchi ◽  
Hao Wang ◽  
Kin Tak Lau
Keyword(s):  
Composite Structures ◽  
Research Work ◽  
Real Life ◽  
Health Condition ◽  
Fibre Bragg Grating ◽  
Advanced Composite ◽  
Fbg Sensor ◽  
Frp Composites ◽  
Comprehensive Health ◽  
Artificial Neural Network Ann

ncreased use of FRP composites for critical load bearing components and structures in recent years has raised the alarm for urgent need of a comprehensive health mentoring system to alert users about integrity and the health condition of advanced composite structures. A few decades of research and development work on structural health monitoring systems using Fibre Bragg Grating (FBG) sensors have come to an accelerated phase at the moment to address these demands in advanced composite industries. However, there are many unresolved problems with identification of damage status of composite structures using FBG spectra and many engineering challenges for implementation of such FBG based SHM system in real life situations. This paper details a research work that was conducted to address one of the critical problems of FBG network, the procedures for immediate rehabilitation of FBG sensor networks due to obsolete/broken sensors. In this study an artificial neural network (ANN) was developed and successfully deployed to virtually simulate the broken/obsolete sensors in a FBG sensor network. It has been found that the prediction of ANN network was within 0.1% error levels.

scholarly journals Analyses of Composite Structures Behaviour with Embedded Bragg Grating Sensors

2006 ◽  
Vol 514-516 ◽  
pp. 614-618
Author(s):  
Carlos A. Ramos ◽  
José Luís Esteves ◽  
Rui A. Silva ◽  
António Torres Marques
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Analysis ◽  
Health Monitoring ◽  
Composite Structures ◽  
Composite Laminate ◽  
Carbon Composite ◽  
Bragg Grating ◽  
Fibre Bragg Grating ◽  
The Finite Element Method

Structural health monitoring of composite structures may be accomplished by measuring strains with embedded optical fibre sensors. In this paper, we present the performance of Bragg grating sensors, which are embedded into a carbon composite laminate and them bonded to the structure in analyse. The paper will briefly discuss the results and compare them with a free fibre Bragg grating bonded in the surface of the carbon composite laminate, with existing electrical strain gauge installation and with a numerical analysis by the finite element method.

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