Delamination monitoring of laminated composites subjected to low-velocity impact using small-diameter FBG sensors

Takeda, Shin‐ichi; Minakuchi, Shu; Okabe, Yoji; Takeda, Nobuo

doi:10.1016/j.compositesa.2004.12.005

Cited by 123 publications

(69 citation statements)

References 15 publications

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“…Figure 1(b) shows a cross section at the delamination region in the 3D FE model. The delamination is modeled by a volume split at the delamination region in which the FE nodes across the delamination surfaces are separated by a small distance according to standard FE simulation practice, 6,23 which is supported by experimental observations reported in Sec. III.…”

Section: Fe Simulations Of Delaminated Composite Laminatesmentioning

confidence: 80%

Scattering of the fundamental anti-symmetric Lamb wave at delaminations in composite laminates

Veidt

2011

The Journal of the Acoustical Society of America

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An analysis of the scattering characteristics of the fundamental anti-symmetric (A0) Lamb wave at a delamination in a quasi-isotropic composite laminate is presented. Analytical solutions for this problem do not exist due to the anisotropic nature and multilayer characteristics of composite laminates. This study uses a three-dimensional finite element (FE) method and experimental measurements to provide physical insight into the scattering phenomena. Good agreement is found between simulations and experimental measurements. The results show that the A0 Lamb wave scattering at a delamination in composite laminates is much more complicated than the scattering at a defect in isotropic plates. Scatter amplitudes and scatter directivity distributions depend on the delamination size to wavelength ratio and the through-thickness location of the delamination damage. The study also investigates the feasibility of the common experimental practice of simulating delamination damage by bonding masses to the surface of composite laminates for guided wave damage detection and characterization methodologies verifications. The results suggest that care is required to use bonded masses to simulate delamination damage for verifying and optimizing damage characterization techniques. In summary, the results of the investigation help to further advance the use of the A0 Lamb wave for damage detection and characterization.

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Section: Fe Simulations Of Delaminated Composite Laminatesmentioning

confidence: 80%

Scattering of the fundamental anti-symmetric Lamb wave at delaminations in composite laminates

Veidt

2011

The Journal of the Acoustical Society of America

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“…The modelled output and the measured output of the signal at 3 mm glue coverage of sensor are shown together in Figure 3. It can be observed that the shape of the modelled reflection spectra, complies significantly with the modelled output, and also with some output signals of delamination type damages in composites that were presented in the literature [6,7]. In fact, even though the real FBG sensors su↵er from intrinsic manufacturing and drawing birefringence, the results of modelling and actual output measurements had a maximum of 0.97 correlation with each other (at 3 mm glue coverage).…”

Section: Physical Casementioning

confidence: 50%

“…It has been shown in the literature that depending on the location of delamination along the length of the FBG sensor, there could be an additional strain distribution in opening areas, either in the middle or on the two end parts of sensor [6].…”

Section: Physical Casementioning

confidence: 99%

Modelling non-uniform strain distributions in aerospace composites using fibre Bragg gratings

et al. 2017

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In this paper the behaviour of fibre Bragg grating (FBG) sensors under non-uniform strain distributions was analysed. Using the fundamental matrix approach, the length of the FBG sensor was discretised, with each segment undergoing di↵erent strain values. FBG sensors that are embedded inside composites, also undergo such non-uniform strain distributions, when located in the vicinity of failures such as matrix cracks or delamination of layers. This non-uniform strain distribution was created in an experimental setup. Finite element analysis was used to analytically model the strain distribution along the FBG length. The measured FBG outputs were then compared to the simulated results. There was a high amplitude correlation between the results of the measured and the simulated reflection spectra with a maximum of 0.97 among all cases.

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“…When broadband light is coupled into the optical fibre sensor, a reflection peak is obtained, centred on a wavelength called the Bragg wavelength, which depends on the refractive index and the period of the grating. These sensors can be used to monitor both strain and damage development [9][10][11][12]. Such sensors are also finding applications for internal strain monitoring in composite ship structures and patch repairs [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Changes in the reflected spectra of embedded chirped fibre Bragg gratings used to monitor disbonding in bonded composite joints

Palaniappan

Wang

Ogin

et al. 2007

Composites Science and Technology

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Delamination monitoring of laminated composites subjected to low-velocity impact using small-diameter FBG sensors

Cited by 123 publications

References 15 publications

Scattering of the fundamental anti-symmetric Lamb wave at delaminations in composite laminates

Scattering of the fundamental anti-symmetric Lamb wave at delaminations in composite laminates

Modelling non-uniform strain distributions in aerospace composites using fibre Bragg gratings

Changes in the reflected spectra of embedded chirped fibre Bragg gratings used to monitor disbonding in bonded composite joints

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