The use of an embedded chirped fibre Bragg grating sensor to monitor disbond initiation and growth in adhesively bonded composite/metal single lap joints

Capell, TF; Palaniappan, J.; Ogin, S.L.; Crocombe, A.D.; Reed, Graham T.; Thorne, A.M.; Mohanty, Lipi; Tjin, Swee Chuan

doi:10.1088/1464-4258/9/6/s07

Cited by 13 publications

(17 citation statements)

References 11 publications

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“…Figure 1 shows a schematic diagram of the single-lap joint and the position of the embedded CFBG sensor. The optical fibre containing the sensor was spliced to the optical arrangement which consisted of a broadband light source, coupler and optical spectrum analyser (details are provided in [14][15][16]). The bonded joints were subjected to fatigue loading using a computer-controlled servohydraulic fatigue machine (Instron 1341) with a peak load of 8 kN, an R-value (R=  min / max ) of 0.1, and a sinusoidal waveform with a frequency of 3 Hz.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…In addition to uniform fibre Bragg gratings, chirped fibre Bragg grating (CFBG) sensors have been investigated more recently for damage monitoring in composite materials, bonded joints and sandwich structures (e.g. [12][13][14][15][16][17]), following the initial demonstration by Takeda, Okabe and colleagues [e.g. 18] that such sensors could both detect and locate damage development in composite materials.…”

Section: Introductionmentioning

confidence: 99%

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Disbond growth detection in composite–composite single-lap joints using chirped FBG sensors

Palaniappan

Ogin

Thorne

et al. 2008

Composites Science and Technology

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Adhesively bonded composite-composite single-lap joints, with cross-ply GFRP adherends, have been cyclically loaded to initiate disbonding at either end of the overlap length. Disbond initiation and growth have been monitored using a combination of in situ photography (the joint is transparent) and a single chirped fibre Bragg grating (CFBG) sensor embedded within one composite adherend (with the low-wavelength end of the sensor adjacent to the cut end) and not in the adhesive bondline. Sensors having the same spectral bandwidth (20 nm), and lengths in the range 15 mm to 60 mm have been tested. The experimental results have been modelled using a combination of finite-element analysis and commercial software for predicting FBG spectra, and the predictions are in very good agreement with the experimental results. In all cases, it has been shown that the position of the disbond front can be located using the CFBG sensors with a precision of about 2 mm.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Disbond growth detection in composite–composite single-lap joints using chirped FBG sensors

Palaniappan

Ogin

Thorne

et al. 2008

Composites Science and Technology

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“…Sanderson et al [9] used surface mounted Chirped fibre Bragg grating (CFBG) sensors in order to monitor delamination growth in a unidirectional reinforced glass fibre/epoxy resin Double Cantilever Beam (DCB) specimen. Capell et al [10] used 60 mm CFBG sensors embedded within glass fibre reinforced plastic (GFRP) adherends to monitor disband initiation and growth in an adhesively bonded GFRP/aluminum alloy SL joint during fatigue cyclic loading.…”

Section: Introductionmentioning

confidence: 99%

Strain Profile Measurement for Structural Health Monitoring of Woven Carbon-fiber Reinforced Polymer Composite Bonded joints by Fiber Optic Sensing Using an Optical Backscatter Reflectometer

Bernasconi

Kharshiduzzaman

Comolli

2015

The Journal of Adhesion

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In order to monitor crack initiation and propagation under static and fatigue loading in adhesively bonded joints, strain profile measurement such as backface strain (BFS) is a very efficient technique. In single lap (SL) joints, crack initiation and propagation in the glue line can be monitored by detecting the negative peak of the strain profile. Therefore, the accuracy of the monitoring system greatly depends on detecting the strain profile correctly and accurately. Previously, an array of electrical strain gages as well as fiber Bragg grating (FBG) sensors had been used successfully to capture the profile of BFS of a SL joint by applying sensors on the backface of an adherend, near the overlap zone. In this work, the backface technique is improved by replacing an array of strain sensors by an ordinary optical fiber (without FBG sensors) connected to an optical backscatter reflectometer. The great advantage of this system over the more conventional arrays of FBG is that the entire length of the fiber can be used for sensing strains, and hence it provides a better spatial resolution. The experimental results are compared with finite element analyses, which were further validated by two-dimensional digital image correlation measurements

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“…The stacking sequence of the cross-ply GFRP and CFRP laminates were [0 4 /90 2 ] s and [0 2 /90/0 2 ] s , respectively. Details of the GFRP and CFRP laminate fabrication are given in references [2][3][4]. The joint was bonded with an epoxy adhesive, AV119, cured at 120 Figure 1.…”

Section: Introductionmentioning

confidence: 99%

“…Schematic of joint geometry, where LW and HW indicate the low and high wavelength ends of the CFBG, respectively The optical interrogation system, which includes a broadband source and an optical spectrum analyser to record the spectra reflected by the CFBG, has been described in detail elsewhere [e.g. [2][3][4]. The joint was subjected to fatigue loading using a computer-controlled servo-hydraulic testing machine (Instron 1175) with a peak load of 8 kN, an R-value of 0.1, and a sinusoidal waveform with a frequency of 6 Hz.…”

Section: Introductionmentioning

confidence: 99%

Effect of Disbond Propagation on the Reflected Spectra of CFBG Sensors Embedded within the Bondline of Composite Bonded Joints

Guo

Ogin

Capell

et al. 2009

AMR

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Abstract. Chirped fiber Bragg grating (CFBG) sensors were embedded within the adhesive bondline of single-lap CFRP-GFRP bonded composite joints. The effect of disbond propagation (as a consequence of fatigue loading) on the reflected spectra from the CFBG sensor has been studied. As the disbond propagates, thermal strains generated during the bonding of the joint at elevated temperature are released and, as a consequence, a peak in the reflected spectra of the CFBG sensor can be seen. Using a transparent GFRP adherend, it has been possible to demonstrate that there is reasonable agreement between the position of the peak in the reflected spectrum and the disbond front position in the bonded joint.

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The use of an embedded chirped fibre Bragg grating sensor to monitor disbond initiation and growth in adhesively bonded composite/metal single lap joints

Cited by 13 publications

References 11 publications

Disbond growth detection in composite–composite single-lap joints using chirped FBG sensors

Disbond growth detection in composite–composite single-lap joints using chirped FBG sensors

Strain Profile Measurement for Structural Health Monitoring of Woven Carbon-fiber Reinforced Polymer Composite Bonded joints by Fiber Optic Sensing Using an Optical Backscatter Reflectometer

Effect of Disbond Propagation on the Reflected Spectra of CFBG Sensors Embedded within the Bondline of Composite Bonded Joints

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