Development of smart composite structures with small-diameter fiber Bragg grating sensors for damage detection: Quantitative evaluation of delamination length in CFRP laminates using Lamb wave sensing

Takeda, Nobuo; Okabe, Yoji; Kuwahara, Junichiro; Kojima, Seiji; Ogisu, Toshimichi

doi:10.1016/j.compscitech.2005.07.014

Cited by 208 publications

(154 citation statements)

References 33 publications

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“…It is surprising to note that all predicted positions are beyond the right end of the delamination. It has been demonstrated that a higher propagation speed of S0 mode in the delaminated 0°layer can make the predicted delamination positions behind the actual delamination [16,17]. From the FEM simulations, the estimated speed of S0 mode in the 0°delaminated layer was 8483 m/s.…”

Section: Numerical Simulationmentioning

confidence: 86%

Locating Delamination in Composite Laminated Beams Using the Zero-Order Mode of Lamb Waves

Liu¹,

Alamusi²,

Li³

et al. 2012

Composites and Their Applications

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Section: Numerical Simulationmentioning

confidence: 86%

Locating Delamination in Composite Laminated Beams Using the Zero-Order Mode of Lamb Waves

Liu¹,

Alamusi²,

Li³

et al. 2012

Composites and Their Applications

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“…In addition, further interpretation of spectral features changed with the extension of delamination [7]. Regarding predictions of delamination size in composites, an indicator of the light intensity ratio of the primary peak to the subordinate peak was proposed by [8]. In addition, [9] states that the two peaks at lower and higher wavelengths in the reflection spectra correspond to the various forms of strain distribution, with the increment of delaminated area of composites.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Subordinate Peak Skewing of FBG Sensor during Cracks Propagation Monitoring on Aluminum Alloy Structure

et al. 2017

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This study investigates the variety of the spectra features of fiber Bragg grating (FBG) around the crack tip during fatigue crack propagation. The study results reveal that the turning of the subordinate peak is significantly associated with crack lengths and corresponds to strain gradient along the FBG. Meanwhile, the strain distribution sensed by the FBG changes with the sensing section of the grating. FBG sensors could observe the monotonic plastic zone ahead of the fatigue crack tip. The cubic strain is distributed along the grating, with monotonic plastic zone propagation at the initial and terminal part of the grating, at approximately a 30% ratio of the entire grating. However, the monotonic plastic zone is sensed by the FBG, at ±15% bias of the grating center, with the quadratic strain gradient pattern along the grating. In particular, when the initial and terminal parts of the grating experience highly inhomogeneous strain distribution, the spectrum distortion occurs.

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“…In that case, since the bulk PZTs utilize their resonant frequency, the generated ultrasonic waves are limited within the narrowband. However, the authors have succeeded in receiving ultrasonic waves by using fiber Bragg grating (FBG) sensors that are a kind of optical fiber sensors (11)~ (13) . On the other hand, macro fiber composite (MFC) actuators developed in NASA consist of a lot of thin PZT fibers (14) and can be used as a generator of ultrasonic waves (15) .…”

Section: Introductionmentioning

confidence: 99%

Damage Detection in Aircraft Composite Materials Using a Built-in Broadband Ultrasonic Propagation System

Okabe

Fujibayashi

Shimazaki

et al. 2011

JSDD

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As one of structural health monitoring systems, the authors developed a broadband ultrasonic propagation system using macro fiber composite (MFC) actuators and fiber Bragg grating (FBG) sensors. This system can send and receive broadband Lamb waves efficiently in a specific direction, and the MFCs and FBGs can be integrated into composite laminates because of their flexibility and high fracture strain. In this research, this system was applied to detect an interlaminar delamination in carbon fiber reinforced plastic (CFRP) laminates. One MFC and one FBG were bonded on each surface of the CFRP laminate to generate and receive the symmetric modes and the anti-symmetric modes separately for identification of the multiple modes of Lamb waves in the laminate. Then we investigated the mode conversion of Lamb waves at both tips of a delamination in the middle of the thickness of the laminate, through an experiment and finite element analysis (FEA). On the basis of the knowledge about the mode conversion, an index to evaluate the delamination length was proposed using velocity changes by the mode conversions. From the results of experiments and FEA for the laminates with an artificial delamination, this new index was found to be effective to evaluate the delamination progress in the laminate quantitatively.

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Development of smart composite structures with small-diameter fiber Bragg grating sensors for damage detection: Quantitative evaluation of delamination length in CFRP laminates using Lamb wave sensing

Cited by 208 publications

References 33 publications

Locating Delamination in Composite Laminated Beams Using the Zero-Order Mode of Lamb Waves

Locating Delamination in Composite Laminated Beams Using the Zero-Order Mode of Lamb Waves

Mechanism of Subordinate Peak Skewing of FBG Sensor during Cracks Propagation Monitoring on Aluminum Alloy Structure

Damage Detection in Aircraft Composite Materials Using a Built-in Broadband Ultrasonic Propagation System

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