Dichotomy property of dispersion equation of guided waves propagating in anisotropic composite plates

Guo, Shuanglin; Rébillat, Marc; Mechbal, Nazih

doi:10.1016/j.ymssp.2021.108212

Cited by 16 publications

(13 citation statements)

References 35 publications

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“…Finally, the displacement and stress mode shapes of the laminate can be portrayed along the plate thickness direction through equations ( 8) and (9). For some composite aeronautic laminates that have symmetry in terms of stacking sequence, the solution points ðω,k * ,θÞ in equation ( 19) can be further classified into symmetric and anti-symmetric modes by checking the symmetry condition 42 of the computed displacement and stress mode shapes at the midplane of the whole laminate, as presented in equation ( 20)…”

Section: Damped Global Matrix Methodsmentioning

confidence: 99%

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Prediction of frequency and spatially dependent attenuation of guided waves propagating in mounted and unmounted A380 parts made up of anisotropic viscoelastic composite laminates

Guo

Rébillat

Mechbal

2022

Structural Health Monitoring

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Monitoring damage in composite structures using guided wave-based techniques is particularly effective due to their excellent ability to propagate over relatively long distance and hence to cover a large area with few testing time and equipment. The industrialization of this method is highly tributary of the number and placement of the active elements. Yet, the optimal sensorization of a structure relies on the decrease in amplitude of guided waves over propagation distance. A reliable prediction of attenuation of guided waves is still a challenge especially for anisotropic viscoelastic composite materials which exhibit complex changes of attenuation with propagation direction and thus a spatial dependency of attenuation. In this paper, the damped global matrix method (dGMM), having stable and efficient merits, is developed to predict the frequency and spatially dependent attenuation of waves propagating in anisotropic composite materials. dGMM integrates three damping models (Hysteretic, Kelvin-Voigt, and Biot models) into the conventional undamped GMM to consider viscoelasticity of composite laminates. The proposed dGMM is first theoretically validated by numerical comparison with the semi-analytical finite element method. In addition, two industrial case studies, parts of an A380 nacelle at scale one, are employed to experimentally validate the proposed attenuation prediction method. The first one is a fan cowl structure and the second one is an inner fixed structure, both either unmounted or mounted on an actual instrumented A380 plane. This makes the validation extremely valuable for both the scientific and industrial communities. The proposed attenuation prediction method thus paves the way to optimally deploy sensor network for structural health monitoring of anisotropic viscoelastic composite structures.

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Section: Damped Global Matrix Methodsmentioning

confidence: 99%

“…Step 1 is trivial because it works out the real case DEs through the undamped GMM. 42 Step 2 is just the realization of the combined dGMM, curve tracing technique, and 2D MRCM.…”

Section: Numerical Algorithm Of Solving the Complex Dispersion Equationmentioning

confidence: 99%

Prediction of frequency and spatially dependent attenuation of guided waves propagating in mounted and unmounted A380 parts made up of anisotropic viscoelastic composite laminates

Guo

Rébillat

Mechbal

2022

Structural Health Monitoring

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“…Different modes are composed of waves with a certain broadband frequency, and in different modes, the wave propagation speed of each frequency component is also different. [47][48][49] AE waves propagate in the PSWB in the form of wave packets at a certain group velocity, which is the superposition of a series of harmonics. Therefore, the group velocity of AE signals at different frequencies should be taken into account when locating the damage of the PSWB.…”

Section: D Location Algorithm For Pswb Damagementioning

confidence: 99%

“…The AE wave has a dispersive characteristic when propagating in the PSWB; that is, the propagating AE signal has various frequency components and multiple modes. Different modes are composed of waves with a certain broadband frequency, and in different modes, the wave propagation speed of each frequency component is also different 47–49 . AE waves propagate in the PSWB in the form of wave packets at a certain group velocity, which is the superposition of a series of harmonics.…”

Section: D Location Algorithm For Pswb Damagementioning

confidence: 99%

Investigation of wave propagation path and damage source 3D localization in parallel steel wire bundle

Liu

2022

Structural Contr & Hlth

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As one of the most important load-bearing components of cable-stayed bridges, the integrity of cables is essential to bridge condition assessment. However, the traditional one-dimensional damage location method has difficulty determining the spatial location of the damage source on parallel steel wire cables.Acoustic emission (AE) technology is a common means of structural health monitoring, and one of its most beneficial attributes is the ability to localize the damage. For this reason, a three-dimensional (3D) location algorithm based on the AE signal propagation path is proposed for cable damage localization. First, the propagation path of simulated AE signals in a parallel steel wire bundle (PSWB) was visualized using COMSOL Multiphysics software platform. Then, a 3D localization algorithm suitable for PSWB damage is proposed based on the propagation path and dispersion characteristics of AE waves. After that, experimental verifications were performed, and it was found that the damage locations can be determined accurately using the proposed algorithm. This algorithm helps to localize the damage source with only a few sensors and is crucial for cable protection and replacement.

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“…However, this information is not known; therefore, it is important that during the design and development phase of any SHM system, a detailed investigation is carried out to choose the optimum parameters of the UGW (frequency, amplitude and mode), which will interact with probable damage types in the plate and enable a reliable damage detection. Many studies have been numerically carried out to capture the guided wave propagation properties in thin composite structures of different layups, materials, complexities and sizes numerically, since experimental investigations are often timely and expensive to allow a deeper understanding of the wave/damage interaction to optimise the parameters of the SHM system, towards condition-based maintenance concepts [ 5 , 11 , 18 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Composite Thickness on Ultrasonic Guided Wave Propagation for Damage Detection

Feng

Khodaei

2022

Sensors

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In this paper, the propagation properties of ultrasonic guided waves (UGWs) in different-thickness composites (i.e., 2, 4 and 9 mm) were critically assessed, and their effectiveness for damage detections and localisations under varying temperatures was demonstrated. A diagnostic film with phased-array lead zirconate titanate (PZT) transducers based on the ink-jet printing technique was used in the experiments. Initially, the dispersion curves for these composites were compared. Next, the effects of the composite thickness on the A0 and S0 mode amplitudes and the group velocity are investigated by active sensing. Next, the behaviours of UGWs under varying temperatures in different-thickness plates were also investigated. Finally, surface-mounted artificial damage and impact damage were detected and located in different composites.

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Dichotomy property of dispersion equation of guided waves propagating in anisotropic composite plates

Cited by 16 publications

References 35 publications

Prediction of frequency and spatially dependent attenuation of guided waves propagating in mounted and unmounted A380 parts made up of anisotropic viscoelastic composite laminates

Prediction of frequency and spatially dependent attenuation of guided waves propagating in mounted and unmounted A380 parts made up of anisotropic viscoelastic composite laminates

Investigation of wave propagation path and damage source 3D localization in parallel steel wire bundle

Influence of Composite Thickness on Ultrasonic Guided Wave Propagation for Damage Detection

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