Interaction of Lamb waves with the edges of a delamination in CFRP composites and a reference-free localization method for delamination

Feng, Bo; Ribeiro, A. Lopes; Ramos, Helena G.

doi:10.1016/j.measurement.2017.10.016

Cited by 46 publications

(22 citation statements)

References 18 publications

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“…a multi-mode character and conversion to other modes on the boundaries of non-uniformities [14], [16]- [20]. The dispersion phenomenon leads to presence of two types of interrelated velocities -phase and group, both frequencies dependent and characterized by dispersion curves [21]- [22].…”

Section: Introductionmentioning

confidence: 99%

Metrological Performance of Hybrid Measurement Technique Applied for the Lamb Waves Phase Velocity Dispersion Evaluation

et al. 2020

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The work presents the metrological evaluation of the modified hybrid spectrum decomposition and zero-crossing technique. The presented technique enables to reconstruct the phase velocity dispersion curve part of Lamb wave modes using only two signals. This is set to consequently simplify the of complex guided wave signals analysis. Experimentally measured asymmetric A 0 mode Lamb wave signals propagating in 4 mm thickness non-homogeneous Glass Fibre Reinforced Plastic (GFRP) plate are used for assessment of the proposed technique. The phase velocity dispersion curve (DC) segments are obtained using three different filter bandwidths as reference using the DC obtained by the semi-analytical finite element method SAFE. The proposed technique quantitative and qualitative characteristics are presented. Using this technique and employing various band-pass filters it is shown that the DC segments are reconstructed in approximately 50%-88% bandwidth of the incident signal frequency spectrum. The average of the calculated expanded uncertainties for all filter bandwidths is equal to approximately 2%. The narrower filter bandwidth has produced smaller systematic errors equal to 1.8%, yielding to wider reconstructed dispersion curve segments.

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Section: Introductionmentioning

confidence: 99%

Metrological Performance of Hybrid Measurement Technique Applied for the Lamb Waves Phase Velocity Dispersion Evaluation

et al. 2020

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“…Many researchers have used the numerical simulation to study lamb waves. The finite element method has been extensively and successfully used to model the Lamb waves and study their interactions with defects in structures [1]…”

Section: Numerical Model Using Finite Element Methodsmentioning

confidence: 99%

“…Composites have been widely used to improve mechanical proprieties of structures. They are used in many fields especially in aeronautic industry [1]. Their characteristics are influenced by the proportions of the matrix and the reinforcements.…”

Section: Introductionmentioning

confidence: 99%

Numerical characterization of Symmetric Delamination in Orthotropic plate using Lamb waves

Nissabouri¹,

Allami²,

Boutyour³

2019

Proceedings of the Third International Conference on Computing and Wireless Communication Systems, ICCWCS 2019, April 24-25, 20

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In this paper we study numerical modeling of Lamb waves propagation and its interaction with the edges of symmetric delamination in unidirectional orthotropic plate [0] 4. The simulations were carried out using ABAQUS CAE by exciting the fundamental A 0 Lamb mode in the frequency 300 kHz. The delamination was then characterized by analyzing the signal picked up at two sensors using two technics: two Dimensional Fast Fourier Transform (2D-FFT) to identify the propagating and converted modes, and Wavelet Transform (WT) to measure the arrival times. The results showed that the mode A 0 is sensible to symmetric delamination. Besides, based on signal changes with the delamination edges, a localization method is proposed to estimate the position and the length of the delamination.

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“…They studied the sensitivity of delamination to applied wavelengths. Studies concerning the interaction of Lamb waves with delamination edges in composites were carried out by Feng et al [13]. They proposed a method for locating delamination using time of flight of symmetric and antisymmetric modes.…”

Section: Introductionmentioning

confidence: 99%

Guided Wave Propagation in Detection of Partial Circumferential Debonding in Concrete Structures

Zima

2019

Sensors

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The following article presents results of investigating the damage detection in reinforced concrete beams with artificially introduced debonding between the rod and cover, using a non-destructive method based on elastic waves propagation. The primary aim of the research was to analyze the possible use of guided waves in partial circumferential debonding detection. Guided waves were excited and registered in reinforced concrete specimens with varying extents of debonding damage by piezoelectric sensors attached at both ends of the beams. Experimental results in the form of time–domain signals registered for variable extent of debonding were compared, and the relationships relating to the damage size and time of flight and average wave velocity were proposed. The experimental results were compared with theoretical predictions based on dispersion curves traced for the free rod of circular cross-section and rectangular reinforced concrete cross-section. The high agreement of theoretical and experimental data proved that the proposed method, taking advantage of average wave velocity, can be efficiently used for assessing debonding size in reinforced concrete structures. It was shown that the development of damage size in circumferential direction has a completely different impact on wave velocity than development of debonding length. The article contains a continuation of work previously conducted on the detection of delamination in concrete structures. The proposed relationship is the next essential step for developing a diagnostics method for detecting debondings of any size and orientation.

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Interaction of Lamb waves with the edges of a delamination in CFRP composites and a reference-free localization method for delamination

Cited by 46 publications

References 18 publications

Metrological Performance of Hybrid Measurement Technique Applied for the Lamb Waves Phase Velocity Dispersion Evaluation

Metrological Performance of Hybrid Measurement Technique Applied for the Lamb Waves Phase Velocity Dispersion Evaluation

Numerical characterization of Symmetric Delamination in Orthotropic plate using Lamb waves

Guided Wave Propagation in Detection of Partial Circumferential Debonding in Concrete Structures

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