Interaction of a guided wave with a nonuniform adhesion bond

Singher, Liviu; Segal, Y.; Shamir, Joseph

doi:10.1016/s0041-624x(97)00007-3

Cited by 8 publications

(5 citation statements)

References 10 publications

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“…Two situations were considered: (a) lap splice joint disbonds detected as a loss of reception signal due to the signal no longer leaking across the splice; and (b) tearstrap disbond or corrosion observed as an increase of the reception signal due to the signal no longer leaking away in the tear strap. The use of Lamb waves for disbond detection was also reported by Singher et al (1997), Mustafa and Chahbaz (1997), and Todd and Challis (1999).…”

Section: Introductionmentioning

confidence: 78%

Embedded Ultrasonic NDE with Piezoelectric Wafer Active Sensors

Giurgiutiu¹

2007

Advanced Ultrasonic Methods for Material and Structure Inspection

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The use of piezoelectric wafer active sensors (PWAS) for embedded ultrasonic nondestructive evaluation (NDE) is described. PWAS structure and principle of operation are presented. The interaction between PWAS and ultrasonic Lamb waves is modeled and analyzed, and excitation "sweet spots" for preferentially exciting certain Lamb wave modes are identified. Recent trends in guided-wave ultrasonic NDE and damage identification are briefly reviewed. Then, the use of PWAS for embedded pulse-echo detection of structural cracks is exemplified. For large area interrogation, PWAS phased arrays are used in conjunction with the embedded ultrasonics structural radar (EUSR) algorithm to create scanning Lamb wave beams. For local area interrogation, the use of PWAS in conjunction with the electromechanical (E/M) impedance method is discussed with examples of local area crack detection in circular plates and aircraft panels. Spectral classification methods based on overall statistics and neural networks are discussed. Passive PWAS usage for acoustic emission and impact detection is presented. The use of PWAS for Rayleigh wave ultrasonics is also illustrated. Finally, we evaluate the role and opportunities of PWAS as the enabling technology for large area structural health monitoring, damage detection, and embedded NDE.

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Section: Introductionmentioning

confidence: 78%

Embedded Ultrasonic NDE with Piezoelectric Wafer Active Sensors

Giurgiutiu¹

2007

Advanced Ultrasonic Methods for Material and Structure Inspection

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“…With both the Green function (11) and the displacement fieldÛ q ðx; z q Þ satisfying the same Neumann boundary condition at the outer surface ðÀL q =2Þ of each plate, the integral formulation equivalent to the problem inside the plates stated above (3a)-(3d), which involves domains D q 0 ¼ ½x 2 ð0; 1Þ; z q 2 ðÀL q =2; L q =2Þ and D q ¼ ½x 2 ð0; 1Þ; z q 2 ðÀL q =2; Z q Þ; can be written as follows (the source term being described by an adapted functionŜ q ðz q Þ at the entrance x 0 ¼ 0 of each plate): 39,40 ðx; z q Þ 2 ðD q Þ;Û q ðx; z q Þ ðx; z q Þ 2 ðD…”

Section: B the Integral Formulationmentioning

confidence: 99%

“…We can quote, among others, characterization and evaluation of adhesion, detection of defects, and lack of adhesion. [6][7][8][9][10][11][12] Concerning the rheological models used to describe the behavior of the glue and the interfaces between it and the structure, mainly two basic models are involved: a cohesive rheological model that corresponds to the standard approach in which the entire adhesive layer is replaced by a spring surface, and an adhesive rheological model which consists in describing only the contact zones by a spring surface distribution (among inertia and dissipation). 13,14 Indeed, the cohesive rheological model makes it possible to quantify global (cohesive) defects in the adhesive layer, while the adhesive rheological model targets local (adhesive) defects on the interface level.…”

Section: Introductionmentioning

confidence: 99%

Shear horizontal acoustic waves propagating along two isotropic solid plates bonded with a non-dissipative adhesive layer: Effects of the rough interfaces

Potel

Bruneau

Ndjomo

et al. 2015

Journal of Applied Physics

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The aim of this paper is to provide an analytical contribution which presents the application of shear-horizontal (SH)-guided waves for the characterisation of a bi-layered structure which consists of two isotropic plates adhesively bonded using a non-dissipative thin layer of glue. The thickness of the layer of glue is assumed to be non-negligible, and the interfaces between this layer of glue and the plates are both assumed to be roughened (parallel ridges with complex shape and depth profiles). The basis of the theoretical approach is an extension of the integral formulation, in the frame of SH modal couplings due to the roughness, which has been developed previously for SH-wave propagation over a single plate with a rough surface. This approach assumes that the average roughness height is a small fraction of the thicknesses of the waveguides (the plates) everywhere. The changes, due to the roughness, in the characteristics of the fields created by a harmonic source set at the entrance edge of the structure are expressed through the mapping of the displacement and stress perturbations. Preliminary tests of the effectiveness of the model are given; they rely on the phase-matching effects of periodic profiles and pseudo-random experimental profile.

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“…Facecore interfacial debonding is a critical issue that causes the failure of sandwich structures 6,7 ; this is because debonding at the adhered regions between the facesheets and the core may occur due to manufacturing flaws or in-service damage. [8][9][10][11] Debonded regions can lead to crack growth, strength and stiffness reduction, and failure. The flexural rigidity, stiffness and strength reductions are more significant for a longer debonded region.…”

Section: Introductionmentioning

confidence: 99%

Vibration behaviours of multi-debonded sandwich beams with symmetric angle-ply facesheets

Tsai

2023

Journal of Composite Materials

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Sandwich beams, comprising two stiff facesheets bonded to a core, are light and strong and see widespread application. However, debonded regions between the facesheets and the core can significantly reduce the strength and have an impact on the vibration behaviour. In this study, the previous literature was referred to, and finite element simulations were conducted using ANSYS on debonded sandwich beams with [0°]4, [+45°/−45°]S and [90°]4 carbon fibre reinforced polymer facesheets. The effects of the configurations of the three debonded regions and facesheet stacking orientations were studied. The most important finding is that if debonds cover vibration nodes, the natural frequencies drop more significantly because the stiffness decreases more. It was determined that when there were debonded regions, the natural frequencies of the bending modes of the beams using [0°]4 facesheets decreased more compared to those of the beams using [+45°/−45°]S and [90°]4 facesheets; while the trends are opposite for the natural frequencies of torsion modes of the beams using [+45°/−45°]S facesheets. Reducing the natural frequency can cause a structure to vibrate at the resonance frequency, leading to structural failure. This study contributes to furthering our understanding of how different debonds and facesheet stacking orientations affect the vibrations of sandwich beams.

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Interaction of a guided wave with a nonuniform adhesion bond

Cited by 8 publications

References 10 publications

Embedded Ultrasonic NDE with Piezoelectric Wafer Active Sensors

Embedded Ultrasonic NDE with Piezoelectric Wafer Active Sensors

Shear horizontal acoustic waves propagating along two isotropic solid plates bonded with a non-dissipative adhesive layer: Effects of the rough interfaces

Vibration behaviours of multi-debonded sandwich beams with symmetric angle-ply facesheets

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