Detection of the degraded interface in dissymmetrical glued structures using Lamb waves

Attar, Latifa; Leduc, Damien; Kettani, Mounsif Ech Cherif El; Predoi, Mihai Valentin; Galy, Jean; Pareige, Pascal

doi:10.1016/j.ndteint.2019.102213

Cited by 13 publications

(14 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Traditional mathematical methods for the calculation of dispersion curves, such as the global matrix method and the transfer matrix method [33,34], may generate a heavy computing burden when the investigated structure is complicated, which stimulates the development of SAFE [35,36]. Numerous works have demonstrated the efficiency of SAFE for calculating dispersion curves in complex multi-layer structures [37][38][39][40].…”

Section: Dispersion Curve Analysis With Safementioning

confidence: 99%

Disbond contour estimation in aluminum/CFRP adhesive joint based on the phase velocity variation of Lamb waves

Tong¹,

Hua²,

Gao³

et al. 2022

Smart Mater. Struct.

View full text Add to dashboard Cite

Adhesive lap joints between composite and metal plates have been widely used in industrial fields including the automotive industry, marine manufacturing and aerospace engineering. Low quality of operation, harsh environment, adhesive aging and other disadvantages may lead to disbonding. To assess the disbond contour at an adhesive interface, this study proposes a detection method based on the phase velocity variation of Lamb waves. First, the dispersion curves of Lamb waves in both single-layer and bonded multi-layer areas are acquired using the semi-analytical finite element (FE) method. Subsequently, numerical models of Lamb wave propagation in intact and disbonded joints are established. Due to the difference in phase velocity between relevant modes, the phase difference of Lamb wave between disbonded and intact joints is quantitatively linear with the disbond length under specific excitation, which is verified by the simulated signals based on FEs. Then, a probabilistic reconstruction algorithm based on phase delay is employed to localize the disbond center. On this basis, the edge points of the disbond are acquired, and the convex envelope of these points is sketched for disbond contour estimation. As a result, both the location and shape of the disbond can be obtained, thereby providing information for subsequent assessment. The experiment is carried out on an adhesive lap joint specimen composed of an aluminum plate and a quasi-isotropic carbon fiber reinforced plastic laminate, and the results demonstrate the effectiveness of the proposed method.

show abstract

Section: Dispersion Curve Analysis With Safementioning

confidence: 99%

Disbond contour estimation in aluminum/CFRP adhesive joint based on the phase velocity variation of Lamb waves

Tong¹,

Hua²,

Gao³

et al. 2022

Smart Mater. Struct.

View full text Add to dashboard Cite

show abstract

“…Studies on the behavior of interfaces between aluminum and FRP layers represent another area in which work on this topic can be found. For this purpose, Attar et al [23] investigate the influence on the dispersion behavior of such a layer numerically and experimentally. Furthermore, LeCrom et al [24] study the bonding layers between aluminum and applied CFRP patches under the consideration of shear-horizontal waves.…”

Section: Introductionmentioning

confidence: 99%

Investigations on Guided Ultrasonic Wave Dispersion Behavior in Fiber Metal Laminates Using Finite Element Eigenvalue Analysis

Barth

Wiedemann

Roloff

et al. 2023

Proc Appl Math and Mech

View full text Add to dashboard Cite

Composite materials such as fiber metal laminates combine the advantages of metallic materials and fiber-reinforced polymers. Hence, these materials are of great interest for thin-walled structures in lightweight engineering. Due to the structure of these materials, damage to fiber metal laminate components occur more frequently inside the structure than with conventional materials. Since the detection of interlaminar damage is more complicated compared to external damage, it is one of the biggest challenges in the use of fiber metal laminates. One approach to detect this kinds of damage, is the use of guided ultrasonic waves, for example Lamb waves. To be able to perform such damage detection, knowledge about the propagation behavior of this kind of waves in fiber metal laminates is fundamental. Abrupt stiffness variations across the thickness of fiber metal laminates, resulting from the different material layers, lead to the question whether the known approaches for the propagation of guided ultrasonic waves in isotropic and transversely isotropic materials are applicable here. Therefore, the objective of this work is to investigate the propagation behavior of these guided ultrasonic waves in fiber-metal laminates over large frequency ranges. For this purpose, dispersion relations from finite element simulations are compared with experimental data and numerical solutions based on the analytical framework. The investigations are carried out using a fiber metal laminate consisting of steel and carbon fiber-reinforced polymers. Due to the orthotropy of the laminate, wave propagation in the fiber direction and perpendicular to it is considered. For the finite element simulations a linear two dimensional eigenvalue analysis is used. This method is especially suitable because it offers a very efficient modeling approach for this kind of application. The experimental data are based on measurements contained in previous publications by the authors. The comparison of the finite element simulations with the experimental data and the data from the analytical framework show that they are in good agreement. The results shown in this work serve to validate the numerical approach presented and allow for further, more complex simulations.

show abstract

“…The interface roughness increases the strength of the joint, but since the interface is not perfectly flat, it leads to a non-uniform stress–strain state and initiates micro-cracks and delaminations. Since laminate assemblies are increasingly employed in engineering structures, studies related to bi-material interface fracture analysis [ 9 ] and the evaluation of accumulated damage or degradation in the early stages of fracture are important for industrial applications [ 7 , 10 ]. The characteristics of ultrasonic wave propagation are directly related to the mechanical properties of laminates [ 11 , 12 , 13 ] and therefore ultrasonic methods are among the most efficient techniques in the field of non-destructive evaluation (NDE) and structural health monitoring (SHM) for evaluating material degradation [ 14 , 15 , 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Effective Boundary Conditions and Stochastic Crack Distribution for Modelling Guided Waves Scattering by a Partially Closed Interfacial Delamination in a Laminate

Golub

Doroshenko

2023

Materials

View full text Add to dashboard Cite

Cohesive and adhesive bindings degrade during operation and maintenance even if contacting materials in a manufactured laminated structure are perfectly matched at the interfaces. Two modelling approaches for describing partially closed delaminations or imperfect contact zones, which often occurs at the interfaces, are examined and considered. To confirm the adequateness of the applicability of the effective spring boundary conditions for guided wave scattering by a finite length delamination, guided wave propagation through a damaged zone with a distribution of micro-cracks is compared with an equivalent cohesive zone model, where the spring stiffnesses for the effective boundary conditions are calculated using the properties of the considered crack distribution. Two kinds of local interfacial decohesion zones with an imperfect contact at the interfaces are considered: uniform partially closed delaminations and bridged cracks. The possibility of the employment of the effective spring boundary conditions to substitute a distribution of micro-cracks is analysed and discussed. Two algorithms of generation of a distribution of open micro-cracks providing characteristics equivalent to the effective boundary conditions are presented and examined. The influence of the characteristics of a delamination on wave characteristics (eigenfrequencies, eigenforms, transmission coefficient) is investigated for several kinds of partially closed delaminations.

show abstract

Detection of the degraded interface in dissymmetrical glued structures using Lamb waves

Cited by 13 publications

References 33 publications

Disbond contour estimation in aluminum/CFRP adhesive joint based on the phase velocity variation of Lamb waves

Disbond contour estimation in aluminum/CFRP adhesive joint based on the phase velocity variation of Lamb waves

Investigations on Guided Ultrasonic Wave Dispersion Behavior in Fiber Metal Laminates Using Finite Element Eigenvalue Analysis

Effective Boundary Conditions and Stochastic Crack Distribution for Modelling Guided Waves Scattering by a Partially Closed Interfacial Delamination in a Laminate

Contact Info

Product

Resources

About