Evaluation of epoxy crosslinking using ultrasonic Lamb waves

Gauthier, Camille; Galy, Jean; Elkettani, Mounsif Echcherif; Leduc, Damien; Izbicki, Jean‐Louis

doi:10.1016/j.ijadhadh.2017.09.008

Cited by 13 publications

(5 citation statements)

References 16 publications

(15 reference statements)

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“…The dispersion curves in the form of the maps representing wavenumber–frequency relations were obtained in the way of 2D-FFT (two-dimensional fast Fourier transform) calculations for each of 12 measurements (cf. [6,36,53]). The final result was the superposition of all the compound maps (Figure 6).…”

Section: Resultsmentioning

confidence: 99%

Wave Frequency Effects on Damage Imaging in Adhesive Joints Using Lamb Waves and RMS

Wojtczak

Rucka

2019

Materials

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Structural adhesive joints have numerous applications in many fields of industry. The gradual deterioration of adhesive material over time causes a possibility of unexpected failure and the need for non-destructive testing of existing joints. The Lamb wave propagation method is one of the most promising techniques for the damage identification of such connections. The aim of this study was experimental and numerical research on the effects of the wave frequency on damage identification in a single-lap adhesive joint of steel plates. The ultrasonic waves were excited at one point of an analyzed specimen and then measured in a certain area of the joint. The recorded wave velocity signals were processed by the way of a root mean square (RMS) calculation, giving the actual position and geometry of defects. In addition to the visual assessment of damage maps, a statistical analysis was conducted. The influence of an excitation frequency value on the obtained visualizations was considered experimentally and numerically in the wide range for a single defect. Supplementary finite element method (FEM) calculations were performed for three additional damage variants. The results revealed some limitations of the proposed method. The main conclusion was that the effectiveness of measurements strongly depends on the chosen wave frequency value.

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Section: Resultsmentioning

confidence: 99%

Wave Frequency Effects on Damage Imaging in Adhesive Joints Using Lamb Waves and RMS

Wojtczak

Rucka

2019

Materials

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“…The wavenumber-frequency relations can be calculated based on a set of wave propagation signals collected in a number of points spaced evenly along a measurement line. One of the popular methods is the use of the two-dimensional fast Fourier transform (2D-FFT [48,54,55]). However, the curves obtained are in the form of 2D maps which can be problematic when comparing different results.…”

Section: Dispersion Curve Estimation With Matrix Pencil Methodsmentioning

confidence: 99%

Detection and Imaging of Debonding in Adhesive Joints of Concrete Beams Strengthened with Steel Plates Using Guided Waves and Weighted Root Mean Square

2020

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Strengthening of engineering structures is an important issue, especially for elements subjected to variable loads. In the case of concrete beams or slabs, one of the most popular approaches assumes mounting an external reinforcement in the form of steel or composite elements by structural adhesives. A significant disadvantage of adhesive joints is the lack of access to the adhesive film for visual condition assessment, thus, there is a need for non-destructive diagnostics of these kinds of connections. The aim of this paper was the identification and visualization of defects in adhesive joints between concrete beams and steel plates using the guided wave propagation technique. The initial theoretical and numerical analyses were performed. The experimental wave field was excited and measured by the scanning laser Doppler vibrometry. The collected signals were processed by the weighted root mean square (WRMS) calculation. As a result, 2-D damage maps were obtained. The numerical simulations were performed to corroborate the experimental results. The results showed that the guided waves could be successfully applied in non-destructive diagnostics of adhesive joints between concrete and steel elements. However, the quality of damage visualizations strongly depended on the location of excitation.

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“…Consequently, the signal treatment in this work is focused on the amplitude variations of the propagating SH wave. Experimentally, Flynn [16] and C. Gauthier et al [17][18][19] showed that the attenuation coefficient of guided waves in the medium were indeed related to the bonding strength and stiffness of the adhesives. In the field of nondestructive evaluation by SH type guided waves, mostly modes SH0, SH1 and rarely SH2 or SH3 have been exploited [20][21][22][23], aiming to identify defects of cohesive or adhesive nature or to detect the adhesive layer thickness [23].…”

Section: Introductionmentioning

confidence: 99%

Detection of kissing bond type defects and evaluation of the bonding quality in metal/adhesive/composite structures by a wavenumber-frequency insensitive SH mode

Attar

Kettani

Leduc

et al. 2023

NDT & E International

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Evaluation of epoxy crosslinking using ultrasonic Lamb waves

Cited by 13 publications

References 16 publications

Wave Frequency Effects on Damage Imaging in Adhesive Joints Using Lamb Waves and RMS

Wave Frequency Effects on Damage Imaging in Adhesive Joints Using Lamb Waves and RMS

Detection and Imaging of Debonding in Adhesive Joints of Concrete Beams Strengthened with Steel Plates Using Guided Waves and Weighted Root Mean Square

Detection of kissing bond type defects and evaluation of the bonding quality in metal/adhesive/composite structures by a wavenumber-frequency insensitive SH mode

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