Evaluation of disbonds at various interfaces of adhesively bonded aluminum plates using all-optical excitation and detection of zero-group velocity Lamb waves

Spytek, Jakub; Ziaja-Sujdak, Aleksandra; Dziedziech, Kajetan; Pieczonka, Łukasz; Pelivanov, Ivan; Ambroziński, Łukasz

doi:10.1016/j.ndteint.2020.102249

Cited by 46 publications

(24 citation statements)

References 38 publications

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“…Together with conventional ultrasonic testing [6], the approaches employing elastic guided waves (EGWs) as a physical basis are emerging to characterize adhesive joint properties [7][8][9][10]. For visualization of localized macroscopic damage in bonded structures with EGWs, non-contact imaging techniques are being developed based on object surface scanning with a laser source [11], laser interferometer [12] and their combinations [13]. Since guided wave dispersion properties strongly depend on structural material parameters, EGWs are valuable for global assessment of adhesive bonding integrity [8,14] and might be also used for the estimation of adhesive mechanical properties [15,16].…”

Section: Introductionmentioning

confidence: 99%

Elastodynamic Behaviour of Laminate Structures with Soft Thin Interlayers: Theory and Experiment

2022

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Laminate structures composed of stiff plates and thin soft interlayers are widely used in aerospace, automotive and civil engineering encouraging the development of reliable non-destructive strategies for their condition assessment. In the paper, elastodynamic behaviour of such laminate structures is investigated with emphasis on its application in ultrasonic based NDT and SHM for the identification of interlayer mechanical and interfacial contact properties. A particular attention is given to the practically important frequency range, in which the wavelength considerably exceeds the thickness of the film. Three layer model with spring-type boundary conditions employed for imperfect contact simulation is used for numerical investigation. Novel effective boundary conditions are derived via asymptotic expansion technique and used for analysis of the peculiar properties of elastic guided waves in considered laminates. It is revealed that the thin and soft film influences the behaviour of the laminate mainly via the effective stiffnesses being a combination of the elastic moduli of the film, its thickness and interface stiffnesses. To evaluate each of these parameters separately (or to figure out that the available experimental data are insufficient), a step-wise procedure employing the effective boundary conditions is proposed and tested versus the laser Doppler vibrometry data for Lamb waves in Aluminium/Polymer film/Alumunium structure. A good agreement between theoretical and experimental data is demonstrated for a certain symmetric laminate specimen. The possibility of using film-related thickness resonance frequencies to estimate the film properties and contact quality is also demonstrated. Additionally, the rich family of edge waves is also investigated, and the splitting of fundamental edge waves into pairs is revealed.

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Section: Introductionmentioning

confidence: 99%

Elastodynamic Behaviour of Laminate Structures with Soft Thin Interlayers: Theory and Experiment

2022

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“…In addition, LU can be used to excite and detect so-called Zero Group Velocity (ZGV) modes. They exhibit great sensitivity to local changes in plate thickness, bond quality, or material properties [ [19] , [20] , [21] , [22] , [23] ]. However, interpreting the ZGV resonance for multi-layered structures is usually very complex due to multiple resonances.…”

Section: Introductionmentioning

confidence: 99%

“…However, interpreting the ZGV resonance for multi-layered structures is usually very complex due to multiple resonances. Thus, without comprehensive numerical simulation, it is challenging to characterize defects based on ZGV resonances in bonded structures [ 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Detection of disbonds in adhesively bonded aluminum plates using laser-generated shear acoustic waves

et al. 2021

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Adhesively bonded metals are increasingly used in many industries. Inspecting these parts remains challenging for modern non-destructive testing techniques. Laser ultrasound (LU) has shown great potential in high-resolution imaging of carbon-reinforced composites. For metals, excitation of longitudinal waves is inefficient without surface ablation. However, shear waves can be efficiently generated in the thermo-elastic regime and used to image defects in metallic structures. Here we present a compact LU system consisting of a high repetition rate diode-pumped laser to excite shear waves and noncontact detection with a highly sensitive fiber optic Sagnac interferometer to inspect adhesively bonded aluminum plates. Multiphysics finite difference simulations are performed to optimize the measurement configuration. Damage detection is performed for a structure consisting of three aluminum plates bonded with an epoxy film. Defects are simulated by a thin Teflon film. It is shown that the proposed technique can efficiently localize defects in both adhesion layers.

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“…In particular, numerous researchers have made use of specific Lamb waves modes, in which both asymmetric and symmetric modes were successfully able to monitor the integrity of three-layer bonding structures [28][29][30][31]. Using zero-group velocity Lamb wave modes generated by laser-ultrasound, Spytek et al [32] identified and imaged debonding defects between various layers of epoxy-bonded aluminium plates. Similar to the previous research, Wojtczak et al [33] proposed a laser-based guided wave technique to detect and visualize disbond at the interface of steel-concrete beams in adhesive joints.…”

Section: Introductionmentioning

confidence: 99%

A novel application of ultrasonic Lamb waves: studying adhesive effects on the inspection of coating debonding in a three-layer waveguide

Mehrabi

Soorgee

Habibi

et al. 2020

Nondestructive Testing and Evaluation

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In this research, a thorough experimental and numerical study is conducted to investigate a novel application of the ultrasonic Lamb waves which is its capability to detect of the coating disbond in a double-layer waveguide (aluminium-adhesive) and a triple-layer waveguide (aluminium-adhesive-coating). The experimental tests are set up and implemented to evaluate how the attenuation of Lamb waves is affected by the adhesive bonding beside the contribution of the coating layer to the behaviour of Lamb waves. The semi-analytical finite element (SAFE) method is employed to analyse and identify the properties of guided wave modes propagating along the coated structures. In the presence of additive white Gaussian noise (AWGN), a range of important indices including energy index (EI), amplitude index (AI), pulse width index (PWI), and the time of flight index (ToFI) are worked out in association with the disbond length. It is inferred that a) even in the very noisy environment of 0 dB SNR, the Lamb waves are effectively able to identify debonding defects particularly using the EI, giving sensitivity rates 105% and 30% for triple-layer and double-layer, respectively; b) the contribution of adhesive to the absorption of the guided wave energy is 30%, 40%, and 50% in EI, AI, and PWI, respectively, corroborating the value of the features to distinguish the debonding between each layer of bonded structures.

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Evaluation of disbonds at various interfaces of adhesively bonded aluminum plates using all-optical excitation and detection of zero-group velocity Lamb waves

Cited by 46 publications

References 38 publications

Elastodynamic Behaviour of Laminate Structures with Soft Thin Interlayers: Theory and Experiment

Elastodynamic Behaviour of Laminate Structures with Soft Thin Interlayers: Theory and Experiment

Detection of disbonds in adhesively bonded aluminum plates using laser-generated shear acoustic waves

A novel application of ultrasonic Lamb waves: studying adhesive effects on the inspection of coating debonding in a three-layer waveguide

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