Lamb waves characterization of adhesion levels in aluminum/epoxy bi-layers with different cohesive and adhesive properties

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

doi:10.1016/j.ijadhadh.2016.12.002

Cited by 31 publications

(26 citation statements)

References 26 publications

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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%

“…Ultrasonic waves are also successfully used for the evaluation of adhesion levels between adhesive and adherends. Gauthier et al [36] analyzed the influence of different adherend surface treatment methods on the guided wave propagation in a single aluminum plate covered with epoxy-based adhesive. Castaings [37] considered a contamination of the overlap surface by an oil pollutant in the single-lap adhesive joints of aluminum plates.…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

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 ( Figure 6) were obtained using 2D-FFT (cf. [23,38]). In the experimental results, theoretical dispersion curves that were obtained using GUIGUW software [39] based on the semi-analytical finite-element formulation [40] were superimposed.…”

Section: Dispersion Curvesmentioning

confidence: 99%

“…The ability of Lamb waves to interact with any kind of defect makes them particularly useful in the diagnostics of various elements of engineering structures, including adhesive joints. In previous studies, guided waves have been proven to be an effective technique for the inspection of adhesive lap joints [15][16][17][18], adhesive bonds between composites [19][20][21], adhesive butt joins of plates [22], or the detectability of the adhesion level [23].…”

Section: Introductionmentioning

confidence: 99%

Damage Imaging in Lamb Wave-Based Inspection of Adhesive Joints

2018

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Adhesive bonding has become increasingly important in many industries. Non-destructive inspection of adhesive joints is essential for the condition assessment and maintenance of a structure containing such joints. The aim of this paper was the experimental investigation of the damage identification of a single lap adhesive joint of metal plate-like structures. Nine joints with different defects in the form of partial debonding were considered. The inspection was based on ultrasonic guided wave propagation. The Lamb waves were excited at one point of the analyzed specimen by means of a piezoelectric actuator, while the guided wave field was measured with the use of a laser vibrometer. For damage imaging, the recorded out-of-plane vibrations were processed by means of the weighted root mean square (WRMS). The influence of different WRMS parameters (i.e., the time window and weighting factor), as well as excitation frequencies, were analyzed using statistical analysis. The results showed that two-dimensional representations of WRMS values allowed for the identification of the presence of actual defects in the adhesive film and determined their geometry.

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“…Air-coupled ultrasonics overcome this limitation; however, the high impedance difference between air and structures causes a significant loss in signal amplitude [ 14 ]. On the other hand, guided wave inspections allow large specimens to be inspected in a short period of time; Lamb waves have been reported to be an effective technique to determine bonding quality [ 23 , 24 ]. However, the analysis of the results has a high level of complexity, and it is usually specimen-specific.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Bonding Quality with Advanced Nondestructive Testing (NDT) and Data Fusion

Yılmaz

Jasiūnienė

et al. 2020

Sensors

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This work aims to compare quantitatively different nondestructive testing (NDT) techniques and data fusion features for the evaluation of adhesive bonding quality. Adhesively bonded composite-epoxy single-lap joints have been investigated with advanced ultrasonic nondestructive testing and induction thermography. Bonded structures with artificial debonding defects in three different case studies have been investigated: debonding with release film inclusion, debonding with brass film-large, debonding with brass film-small. After completing preprocessing of the data for data fusion, the feature matrices, depending on the interface reflection peak-to-peak amplitude and the principal component analysis, have been extracted from ultrasonic and thermography inspection results, respectively. The obtained feature matrices have been used as the source in basic (average, difference, weighted average, Hadamard product) and statistical (Dempster–Shafer rule of combination) data fusion algorithms. The defect detection performances of advanced nondestructive testing techniques, in addition to data fusion algorithms have been evaluated quantitatively by receiver operating characteristics. In conclusion, it is shown that data fusion can increase the detectability of artificial debonding in single-lap joints.

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Lamb waves characterization of adhesion levels in aluminum/epoxy bi-layers with different cohesive and adhesive properties

Cited by 31 publications

References 26 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

Damage Imaging in Lamb Wave-Based Inspection of Adhesive Joints

Evaluation of Bonding Quality with Advanced Nondestructive Testing (NDT) and Data Fusion

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