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Journal ArticleDOI

Detection of fundamental shear horizontal mode in plates using fibre Bragg gratings

27 Jan 2016-Journal of Intelligent Material Systems and Structures (SAGE Publications)-Vol. 27, Iss: 16, pp 2229-2236
TL;DR: Shear horizontal guided waves are attractive for structural health monitoring applications in view of the non-dispersive behaviour of the fundamental mode, possibly higher frequencies of operation as mentioned in this paper. But they are difficult to use in practice.
Abstract: Shear horizontal guided waves are attractive for structural health monitoring applications in view of the non-dispersive behaviour of the fundamental mode, possibly higher frequencies of operation ...
Citations
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Journal ArticleDOI
TL;DR: The feasibility of detection of delamination is experimentally demonstrated, whose size is comparable to the ultrasonic wavelength with probability of detection better than 90% using <1% of the total number of samples required for conventional imaging, even under conditions wherein the SNR is as low as 5 dB.

75 citations

Journal ArticleDOI
TL;DR: In this paper, a review of the state-of-the-art SH wave transducers for structural health monitoring (SHM) and nondestructive testing (NDT) is presented.

67 citations

Journal ArticleDOI
TL;DR: In this article , a baseline-free statistical approach for the identification and localization of delamination using sparse sampling and density-based spatial clustering of applications with noise (DBSCAN) technique is proposed.
Abstract: Delamination in composite structures is characterized by a resonant cavity wherein a fraction of an ultrasonic guided wave may be trapped. Based on this wave trapping phenomenon, we propose a baseline-free statistical approach for the identification and localization of delamination using sparse sampling and density-based spatial clustering of applications with noise (DBSCAN) technique. The proposed technique can be deployed for rapid inspection with minimal human intervention. The Performance of the proposed technique in terms of its ability to determine the precise location of such defects is quantified through the probability of detection measurements. The robustness of the proposed technique is tested through extensive simulations consisting of different random locations of defects on flat plate structures with different sizes and orientation as well as different values of signal to noise ratio of the simulated data. The simulation results are also validated using experimental data and the results are found to be in good agreement.

67 citations

Journal ArticleDOI
11 Oct 2018-Sensors
TL;DR: In this review, the mature techniques of FBG-based ultrasonic sensors and their practical applications in ultrasonic structural health monitoring are discussed and state-of-the-art techniques are introduced to fully present the current developments.
Abstract: The fiber Bragg grating (FBG) sensor, which was developed over recent decades, has been widely used to measure manifold static measurands in a variety of industrial sectors. Multiple experiments have demonstrated its ability in ultrasonic detection and its potential in ultrasonic structural health monitoring. Unlike static measurements, ultrasonic detection requires a higher sensitivity and broader bandwidth to ensure the fidelity of the ultrasonic Lamb wave that propagates in a plate-like structure for the subsequent waveform analysis. Thus, the FBG sensor head and its corresponding demodulation system need to be carefully designed, and other practical issues, such as the installation methods and data process methods, should also be properly addressed. In this review, the mature techniques of FBG-based ultrasonic sensors and their practical applications in ultrasonic structural health monitoring are discussed. In addition, state-of-the-art techniques are introduced to fully present the current developments.

66 citations


Cites background from "Detection of fundamental shear hori..."

  • ...have experimentally demonstrated that the FBGs, when placed along a direction perpendicular to a propagating elastic wave, can detect the fundamental shear horizontal mode [87]....

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  • ...have experimentally demonst ated hat th FBGs, when placed along a direction perpe dicula to a propagating elas ic wave, can detect the fundamental shear orizontal mode [87]....

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Journal ArticleDOI
TL;DR: In this paper, the face-shear (d36) mode of PbZr1−xTixO3 (PZT) ceramics was investigated for non-destructive testing and structural health monitoring.
Abstract: The fundamental shear horizontal (SH0) wave in plate-like structures is extremely useful for non-destructive testing (NDT) and structural health monitoring (SHM) as it is non-dispersive. However, currently, the SH0 wave is usually excited by electromagnetic acoustic transducers (EMAT) whose energy conversion efficiency is fairly low. The face-shear ( d36) mode piezoelectrics is more promising for SH0 wave excitation, but this mode cannot appear in conventional piezoelectric ceramics. Recently, by modifying the symmetry of poled PbZr1−xTixO3 (PZT) ceramics via ferroelastic domain engineering, we realized the face-shear d36 mode in both soft and hard PZT ceramics. In this work, we further improved the face-shear properties of PZT-4 and PZT-5H ceramics via lateral compression under elevated temperature. It was found that when bonded on a 1 mm-thick aluminum plate, the d36 type PZT-4 exhibited better face-shear performance than PZT-5H. We then successfully excite SH0 wave in the aluminum plate using a face-sh...

50 citations

References
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Journal ArticleDOI
TL;DR: A comprehensive review on the state of the art of Lamb wave-based damage identification approaches for composite structures, addressing the advances and achievements in these techniques in the past decades, is provided in this paper.

1,350 citations

Journal ArticleDOI
TL;DR: This paper begins with an overview of damage prognosis, and a description of the basic methodology of guided-wave SHM, then reviews developments from the open literature in various aspects of this truly multidisciplinary field.
Abstract: In this paper we present the state of the art in the field of guided-wave structural health monitoring (SHM). We begin with an overview of damage prognosis, and a description of the basic methodology of guided-wave SHM. We then review developments from the open literature in various aspects of this truly multidisciplinary field. First, we discuss different transducer technologies, including both piezoelectric and non-conventional popular and non-conventional piezoelectric transducers. Next, we examine guided-wave theory, tracing its early history down to modern developments. Following this, we detail the efforts into models for guided-wave excitation by SHM transducers. Then, we review several signal processing related works. The next topic in Section 6 is guided-wave SHM system development, and we explore various packaging ideas, integrated solutions and efforts to examine robustness to different service conditions. We also highlight the broad spectrum of applications in which this technology has been tested. We then present some investigations that have attempted to combine guided-wave approaches with other complementary SHM technologies for better system performance. Finally, we propose desirable developments for further advancement of this field.

988 citations


"Detection of fundamental shear hori..." refers background in this paper

  • ...In several SHM applications, especially in damage detection of aircrafts and vehicles, guided wave–based ultrasonic inspection is attractive (Raghavan and Cesnik, 2007; Rajagopalan et al., 2006; Rocha et al., 2013; Su et al., 2006)....

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Journal ArticleDOI
TL;DR: In this paper, the authors present an overview of current research and development in the field of structural health monitoring with civil engineering applications, including building, piles, bridges, pipelines, tunnels, and dams.

838 citations


"Detection of fundamental shear hori..." refers background in this paper

  • ...…Bragg grating (FBG) sensors have been found to offer several advantages over their piezo-ceramic counterparts, such as negligible electromagnetic interference, ease of multiplexing and the ability to act as a multifunctional sensor (Li et al., 2004; Takeda et al., 2008; Teixeira et al., 2014)....

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Journal ArticleDOI
TL;DR: In this paper, the authors explicitly state and justify structural health monitoring axioms, and stimulate discussion and thought within the community regarding these axiomatizations, in order to facilitate new researchers in the field a starting point that alleviates the need to review the vast amounts of literature in this field.
Abstract: Based on the extensive literature that has developed on structural health monitoring over the last 20 years, it can be argued that this field has matured to the point where several fundamental axioms, or gen eral principles, have emerged. The intention of this paper is to explicitly state and justify these axioms. In so doing, it is hoped that two subsequent goals are facilitated. First, the statement of such axioms will give new researchers in the field a starting point that alleviates the need to review the vast amounts of literature in this field. Second, the authors hope to stimulate discussion and thought within the community regarding these axioms.

514 citations


"Detection of fundamental shear hori..." refers background in this paper

  • ...Structural health monitoring (SHM) is emerging as a key component of modern engineering practice, aimed at reducing the risk of catastrophic failure and improving safety and reliability of operations (Keith et al., 2007)....

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Book ChapterDOI
01 Jan 1997
TL;DR: In this article, 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 is presented, using the global matrix method to handle multi-layered Cartesian and cylindrical systems.
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.

485 citations


"Detection of fundamental shear hori..." refers methods in this paper

  • ...In order to understand the dispersive properties of the various guided modes, we plotted their dispersion curves for 1-mm-thick aluminium plate used in our test bed through the ‘Disperse’ software (Pavlakovic et al., 1997)....

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  • ...Group velocity dispersion curves of some modes for an aluminium plate of 1 mm thickness obtained using ‘Disperse’ (Pavlakovic et al., 1997)....

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  • ...Material parameters fed into the ‘Disperse’ program are as follows: Young’s modulus = 70 GPa, Poisson’s ratio = 0.35 and density = 2.7 g/cm3....

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  • ...According to the group velocity dispersion curves obtained through our simulations in ‘Disperse’ software, the velocities of the A0 and S0 modes for an excitation of 100 kHz frequency are approximately 1800 and 5350 m/s, respectively....

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