Monitoring of fatigue crack growth in composite adhesively bonded joints using Fiber Bragg Gratings

Bernasconi, A.; Carboni, M.; Comolli, Lorenzo

doi:10.1016/j.proeng.2011.04.037

Cited by 42 publications

(30 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An SHM system's main purpose is to give information about the presence of damage in an accurate way, its location with a good resolution for possible repair/maintenance, the type of damage (that in a complex structure like a wind turbine can be very diverse), the severity of the damage and finally prognostic information about the remaining operating life [28].…”

Section: Structural Health Monitoringmentioning

confidence: 99%

Damage tolerance and structural monitoring for wind turbine blades

McGugan

Pereira

Sørensen

et al. 2015

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

The paper proposes a methodology for reliable design and maintenance of wind turbine rotor blades using a condition monitoring approach and a damage tolerance index coupling the material and structure. By improving the understanding of material properties that control damage propagation it will be possible to combine damage tolerant structural design, monitoring systems, inspection techniques and modelling to manage the life cycle of the structures. This will allow an efficient operation of the wind turbine in terms of load alleviation, limited maintenance and repair leading to a more effective exploitation of offshore wind.

show abstract

Section: Structural Health Monitoringmentioning

confidence: 99%

Damage tolerance and structural monitoring for wind turbine blades

McGugan

Pereira

Sørensen

et al. 2015

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

show abstract

“…As the crack detection greatly depends on the measurement of the BFS profile, an array of strain sensors, electrical strain gages as well as FBGs, were used for this purpose in various previous works [3,4,13].…”

Section: Optical Fiber and Optical Backscatter Reflectometer (Obr)mentioning

confidence: 99%

“…the backface of the bonded joint. Another interesting possibility is to place the sensors inside composite laminates, nearer to the crack [3].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Self Cite

View full text Add to dashboard Cite

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

show abstract

“…Yuan [14] applied a wavelet analysis theory to extract two damage factors, the crack initiation factor (CIF) and the crack propagation factor (CPF), for damage initiation and propagation degree identification. Bernasconi [15] investigated experimentally a fatigue crack growth in adhesively-bonded joints of thick composite laminates by employing an array of FBG sensors. The transfer matrix method (T-matrix) was firstly introduced by Leblanc [16] to simulate the reflection intensity spectrum of FBG according to the strain profile along the grating.…”

Section: Introductionmentioning

confidence: 99%

Probabilistic Model Updating for Sizing of Hole-Edge Crack Using Fiber Bragg Grating Sensors and the High-Order Extended Finite Element Method

Yang

Wang

et al. 2016

Sensors

View full text Add to dashboard Cite

This paper presents a novel framework for probabilistic crack size quantification using fiber Bragg grating (FBG) sensors. The key idea is to use a high-order extended finite element method (XFEM) together with a transfer (T)-matrix method to analyze the reflection intensity spectra of FBG sensors, for various crack sizes. Compared with the standard FEM, the XFEM offers two superior capabilities: (i) a more accurate representation of fields in the vicinity of the crack tip singularity and (ii) alleviation of the need for costly re-meshing as the crack size changes. Apart from the classical four-term asymptotic enrichment functions in XFEM, we also propose to incorporate higher-order functions, aiming to further improve the accuracy of strain fields upon which the reflection intensity spectra are based. The wavelength of the reflection intensity spectra is extracted as a damage sensitive quantity, and a baseline model with five parameters is established to quantify its correlation with the crack size. In order to test the feasibility of the predictive model, we design FBG sensor-based experiments to detect fatigue crack growth in structures. Furthermore, a Bayesian method is proposed to update the parameters of the baseline model using only a few available experimental data points (wavelength versus crack size) measured by one of the FBG sensors and an optical microscope, respectively. Given the remaining data points of wavelengths, even measured by FBG sensors at different positions, the updated model is shown to give crack size predictions that match well with the experimental observations.

show abstract

Monitoring of fatigue crack growth in composite adhesively bonded joints using Fiber Bragg Gratings

Cited by 42 publications

References 7 publications

Damage tolerance and structural monitoring for wind turbine blades

Damage tolerance and structural monitoring for wind turbine blades

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

Probabilistic Model Updating for Sizing of Hole-Edge Crack Using Fiber Bragg Grating Sensors and the High-Order Extended Finite Element Method

Contact Info

Product

Resources

About