scispace - formally typeset

Proceedings ArticleDOI

Detection of Guided Waves in a Composite Plate Using Surface Bonded Fiber Bragg Gratings Sensor

01 Oct 2018-

Abstract: Ultrasonic guided waves based non-destructive testing (NDT) is attractive due to its potential for long range inspection. In NDT, fiber Bragg gratings (FBG) sensor is widely adopted due to its rugged wavelength encoded information and immunity to electromagnetic interference (EMI). In this paper we discuss the reception of ultrasonic guided waves in a glass fiber reinforced plastic (GFRP) composite plate using a surface bonded FBG sensor. Experimentally deduced values for wave velocity and attenuation are compared with the theoretical values.
Topics: Fiber Bragg grating (61%), Composite plate (54%), Ultrasonic sensor (54%), Nondestructive testing (53%), Wavelength (51%)
References
More filters

Book ChapterDOI
01 Jan 1997
Abstract: The application of guided waves in NDT can be hampered by the lack of readily available dispersion curves for complex structures. To overcome this hindrance, we have developed a general purpose program that can create dispersion curves for a very wide range of systems and then effectively communicate the information contained within those curves. The program uses the global matrix method to handle multi-layered Cartesian and cylindrical systems. The solution routines cover both leaky and non-leaky cases and remain robust for systems which are known to be difficult, such as large frequency-thicknesses and thin layers embedded in much thicker layers. Elastic and visco-elastic isotropic materials are fully supported; anisotropic materials are also covered, but are currently limited to the elastic, non-leaky, Cartesian case.

443 citations


"Detection of Guided Waves in a Comp..." refers methods in this paper

  • ...The dispersion of the A0 mode is plotted as shown in Figure 5, and compared with results obtained by Disperse....

    [...]

  • ...The group velocities of the composite plate are calculated analytically using a commercial software called Disperse [8] and are plotted in Figure 2....

    [...]

  • ...Theoretical group velocity dispersion curves for S0 and A0 modes in the GFRP composite plate obtained from Disperse [8]....

    [...]


Journal ArticleDOI
Abstract: A sensor embedded in the composite laminate can act as a temperature transducer during the composite cure mechanism. Once the composite is cured, the same sensor can be used to provide the information about the mechanical changes that influence the performance of the material. Fiber Bragg Grating (FBG) sensor is one such sensor which one can use for the composite cure monitoring. We present here the results obtained with an associated FBG sensor system for the cure monitoring of smart composites. The performance of the embedded FBG sensor smart composite specimens under 3- and 4-point bending conditions are also being investigated. Finally, the performance analysis has been extended to cantilever specimens.

169 citations


"Detection of Guided Waves in a Comp..." refers background in this paper

  • ...Structural health monitoring of composites has been demonstrated through several techniques for monitoring features such delamination, stiffness of composite plates and other mechanical properties [2], [3], [4], [5], [6]....

    [...]


Journal ArticleDOI
Shin-ichi Takeda1, Yoji Okabe2, Nobuo Takeda2Institutions (2)
Abstract: Chirped fiber Bragg grating (FBG) sensors are applied to the monitoring of the propagation direction and the size of a delamination in CFRP cross-ply laminates, since it has been found previously that the reflection spectrum from chirped FBG sensors is expressed as a function of their positions along the grating. The reflection spectra are measured at various delamination lengths under a four-point bending test. Two chirped FBG sensors are embedded in two opposite directions in order to investigate the relationship between the deformation of the spectrum and the propagation direction of the delamination. The spectrum changes sensitively depending on both the size and the propagation direction of the delamination. For confirmation of the measured results, the spectra are simulated using FEA computed strain distributions of the chirped FBG sensors. In the simulation, a birefringence effect of the optical fiber on the spectrum is observed in the case of chirped FBG sensors. The relationship between the measured spectral change and the delamination growth is illustrated by the calculated spectra, the strain distributions, and the properties of the chirped FBG sensors. As a result, it is found that not only the delamination size, but also the propagation direction of the delamination can be evaluated by using chirped FBG sensors.

41 citations


"Detection of Guided Waves in a Comp..." refers background in this paper

  • ...Structural health monitoring of composites has been demonstrated through several techniques for monitoring features such delamination, stiffness of composite plates and other mechanical properties [2], [3], [4], [5], [6]....

    [...]


Journal ArticleDOI
H.C.H. Li1, Israel Herszberg2, Adrian P. Mouritz1, Claire Davis3  +1 moreInstitutions (3)
Abstract: The potential application of embedded fibre optic Bragg grating strain sensors for the health monitoring of adhesively bonded composite ship joints is investigated in this paper. Bragg grating sensors were embedded at various locations along the interface of adhesively bonded glass-reinforced plastic composite joints with artificially introduced disbonds to assess their capability to detect bond-line damage under in-plane shear and through-thickness tension. Finite element (FE) models indicated that the presence of the disbond significantly altered the bond-line strain distribution under such loads. The embedded sensors successfully detected this effect, and the sensor measurements compared well to FE predictions. However, the experimental measurements of the magnitude of the strain at the tips of the disbonds showed significant variations, presumably due to its high sensitivity to defect edge conditions which could not be experimentally controlled with a high degree of repeatability. Both the FE models and the experimental results showed that the effect of disbond damage was localised, more so under in-plane shear than through-thickness tension. This would necessitate the use of an optimised sensor array and pattern recognition algorithm for the reliable detection of an arbitrary disbond.

34 citations


"Detection of Guided Waves in a Comp..." refers background in this paper

  • ...Structural health monitoring of composites has been demonstrated through several techniques for monitoring features such delamination, stiffness of composite plates and other mechanical properties [2], [3], [4], [5], [6]....

    [...]


Journal ArticleDOI
Abstract: An optical fiber sensor is designed to simultaneously measure strain and temperature in an adaptive composite material The sensor is formed by splicing two fiber Bragg gratings (FBGs) close to each other, which are written in optical fibers with different core dopants and concentrations Their temperature sensitivities are hence different The sensor is tested on an adaptive composite laminate made of unidirectional Kevlar-epoxy prepreg plies Several 150 μm diameter prestrained NiTiCu shape memory alloy (SMA) wires are embedded in the composite laminate together with one fiber sensor Simultaneous monitoring of strain and temperature during the curing process and activation in an oven is demonstrated

31 citations


"Detection of Guided Waves in a Comp..." refers background in this paper

  • ...Structural health monitoring of composites has been demonstrated through several techniques for monitoring features such delamination, stiffness of composite plates and other mechanical properties [2], [3], [4], [5], [6]....

    [...]