Guided wave scattering at a delamination in a quasi-isotropic composite laminate: Experiment and simulation

Hervin, Flora; Maio, Leandro; Fromme, Paul

doi:10.1016/j.compstruct.2021.114406

Cited by 37 publications

(31 citation statements)

References 43 publications

(60 reference statements)

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“…A 20mm diameter circular zero volume delamination was incorporated into the model by overwriting existing elements at the delamination location [19]. A square area of new nodes with approximate dimensions of the delamination, connected to one side of the plate, were defined.…”

Section: Finite Element Simulationsmentioning

confidence: 99%

“…The amplitude of the forward scattered wave is dependent on the delamination size, shape, and thickness of the sub-laminate (i.e., delamination depth) [7,16,17]. Delaminations located at an asymmetric depth experience high trapped amplitude on top of the delamination, with some forward scattering occurring, whereas delaminations located towards the mid-plane experience a much greater forward scattered amplitude, but limited wave trapping [18,19]. Anisotropy of individual ply layers, and the layup of the laminate can influence guided wave propagation and scattering directivity [20].…”

Section: Introductionmentioning

confidence: 99%

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Effect of material anisotropy on guided wave propagation and scattering in CFRP laminates

Hervin

Fromme

2022

Health Monitoring of Structural and Biological Systems XVI

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Carbon fiber laminates, consisting of highly anisotropic fiber-matrix ply-layers, are widely used in aerospace applications due to their good strength to weight ratio. However, poor interlaminar strength makes them prone to barely visible impact damage (BVID), significantly reducing the load bearing capacity of aircraft components. Guided ultrasonic waves have been widely used for structural health monitoring (SHM) of composite structures. Guided wave propagation and scattering at circular delaminations in a quasi-isotropic laminate was modelled using full three-dimensional (3D) Finite Element (FE) simulations in ABAQUS. Non-contact laser measurements were performed to obtain the scattered wavefield at a film insert delamination. The influence of ply layer anisotropy and incident wave direction were investigated both numerically and experimentally. Scattering directivity patterns were calculated using a baseline subtraction method and 2D scattering matrices were obtained for all incident wave directions. Circular magnets were used as a scattering target and numerical and measured scattering patterns were compared with those of the insert delamination. Strong directional dependency was observed for incident and scattered waves around both delamination and magnets, indicating energy focusing along the outer ply layers of the laminate. For the delamination a strong forward wave was observed, with low amplitude in other directions, whereas the magnet blocked forward transmission of the wave, demonstrating distinct scattering behavior. The anisotropic effects and different scattering patterns should be considered for guided wave sparse array SHM to ensure the robustness of imaging algorithms.

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Section: Finite Element Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of material anisotropy on guided wave propagation and scattering in CFRP laminates

Hervin

Fromme

2022

Health Monitoring of Structural and Biological Systems XVI

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“…Using ultrasonic guided waves is a common method for periodic inspection and monitoring of structural integrity of plate-like composite laminates, that offers large inspection areas and sensitivity to structural damage of various kinds [6][7][8]. To date, many studies are available that employ guided waves for the detection and quantification of impact damage [9][10][11][12], delaminations [13][14][15][16][17], and other defects in composite laminates. Guided wave propagation in composites is determined by many factors, including, but not limited to, multi-layered structure and anisotropy, object boundaries, dispersion, multiple co-existing modes, and mode conversion.…”

Section: Introductionmentioning

confidence: 99%

Guided Wave Phase Velocity Dispersion Reconstruction Based on Enhanced Phased Spectrum Method

Samaitis

Mažeika

2022

Materials

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Fibre-reinforced composite laminates are frequently used in various engineering structures, due to their increased weight-to-stiffness ratio, which allows to fulfil certain regulations of CO2 emissions. Limited inter-laminar strength makes composites prone to formation of various defects, which leads to progressive degradation of residual strength and fatigue life of the structure. Using ultrasonic guided waves is a common technique for assessing the structural integrity of composite laminates. Phase velocity is one of the fundamental characteristics of guided waves and can be used for defect detection, material property estimation, and evaluation of dispersion. In this paper, a phase velocity reconstruction approach, based on the phase-shift method, was proposed, which uses frequency sweep excitation to estimate velocity at specific frequency harmonics. In contrast to the conventional phase spectrum technique, the proposed approach is applicable to the narrowband piezoelectric transducers and suitable for the reconstruction of dispersion curves for direct, converted, and multiple co-existing modes with high accuracy. The proposed technique was validated with finite element simulations and experiments, both on isotropic and anisotropic structures, analysing the direct, converted, and overlapped modes. The results demonstrated that, using the proposed technique, the phase velocity dispersion can be reconstructed at −20 dB level bandwidth of the transducer, with a relative error of ±4%, compared to the theoretical velocity predictions.

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“…In thin composite structures, matrix cracking caused by impact is generated from the lowest ply layer because of bending stress. In addition, a reverse pine-tree pattern is formed, since intra-ply cracks and interface delamination propagate from the lowest surface to the impact surface [ 11 ]. In thick composite structures, the damage propagates away from the impact location in the shape of a cone and forms a pin-tree pattern [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, a reverse pine-tree pattern is formed, since intra-ply cracks and interface delamination propagate from the lowest surface to the impact surface [ 11 ]. In thick composite structures, the damage propagates away from the impact location in the shape of a cone and forms a pin-tree pattern [ 11 ]. It is also demonstrated that thicker composite structures have higher bending stiffness and higher compression after impact strength [ 8 ].…”

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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Guided wave scattering at a delamination in a quasi-isotropic composite laminate: Experiment and simulation

Cited by 37 publications

References 43 publications

Effect of material anisotropy on guided wave propagation and scattering in CFRP laminates

Effect of material anisotropy on guided wave propagation and scattering in CFRP laminates

Guided Wave Phase Velocity Dispersion Reconstruction Based on Enhanced Phased Spectrum Method

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

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