Influence of volumic fraction of adhesive in elastic and viscous thin bonded Aluminum/Adhesive/Aluminum plate on Lamb modes that have ZGV modes

Dahmen, Souhail

doi:10.1016/j.ultras.2018.12.005

Cited by 13 publications

(6 citation statements)

References 21 publications

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“…In the KV model, the viscoelastic coefficients are assumed to increase linearly with increasing frequency. HY model assumptions have been used to solve the dispersion equation in a viscous multilayer plate by using the Matrix Transfer (MT) method [13,14], the Stiffness Matrix (SM) method [15], the Global Matrix (GM) method [16] and the Legendre Polynomial (LP) method [17].…”

Section: Introductionmentioning

confidence: 99%

Optimization of coupled Lamb wave parameters for defect detection in anisotropic composite three-layer with Kelvin-Voigt viscoelasticity using Legendre polynomial method

Dahmen

Glorieux

2021

Composite Structures

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Section: Introductionmentioning

confidence: 99%

Optimization of coupled Lamb wave parameters for defect detection in anisotropic composite three-layer with Kelvin-Voigt viscoelasticity using Legendre polynomial method

Dahmen

Glorieux

2021

Composite Structures

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“…= κ eff 3 = 24.5-27.5 GPa/mm by fitting the experimental data in the region Z \ A with the SCs, calculated on the basis of the model with zero-order EBC. The provisional Poisson's ratio (49) changes in the limits ν pr =0.474-0.481 and seems to be too high for this material. Since ν pr increases when ξ eff 1 grows, we can suggest that the film-aluminium interface has some compliance in the tangential direction.…”

Section: Analysis Of the Experimental Datamentioning

confidence: 85%

“…For further research endeavors, it is essential to address viscoelastic behaviour of the interlayer typical for polymer-based materials in a three-layered model (Section 2.1) and EBCs and to investigate its influence on fundamental and high-order EGWs [49]. Another topic of emerging interest is the extension of the proposed methodology to metal-composite and composite-composite bonded structures [50] considering anisotropic mechanical properties of sublayers.…”

Section: Discussionmentioning

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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“…The provisional Poisson's ratio(49) changes in the limits ν pr =0.474-0.481 and seems to 547 be too high for this material. Since ν pr increases when ξ eff 1 grows, we can suggest that the548 film-aluminium interface has some compliance in the tangential direction.…”

mentioning

confidence: 88%

“…The peculiar property of the thin and soft film is that the lowest of its thickness 598 resonance frequencies can be found in the low-frequency range, available for the experi-599 mental investigation. In this case, some additional information about the film-related 600 parameters can be obtained, even if these frequencies could be observed only as gaps in and EBCs and to investigate its influence on fundamental and high-order EGWs [49].…”

mentioning

confidence: 99%

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

Wilde¹,

Golub²,

Eremin³

2022

Preprint

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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. 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.

show abstract

Influence of volumic fraction of adhesive in elastic and viscous thin bonded Aluminum/Adhesive/Aluminum plate on Lamb modes that have ZGV modes

Cited by 13 publications

References 21 publications

Optimization of coupled Lamb wave parameters for defect detection in anisotropic composite three-layer with Kelvin-Voigt viscoelasticity using Legendre polynomial method

Optimization of coupled Lamb wave parameters for defect detection in anisotropic composite three-layer with Kelvin-Voigt viscoelasticity using Legendre polynomial method

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

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

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