Damage detection with the fundamental mode of edge waves

Hughes, James M.; Mohabuth, Munawwar; Khanna, Aditya; Vidler, James; Kotousov, Andrei; Ng, Ching‐Tai

doi:10.1177/1475921720920314

Cited by 17 publications

(11 citation statements)

References 25 publications

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“…In this case, the plate can support one more type of GWs-edge waves (EWs), propagating along the edge x 2 = 0 in x 1 direction and exponentially decaying as x 2 → −∞. These waves were intensively studied theoretically (see the overview [42] and the references therein), in the recent time their existence and properties were confirmed in several experimental studies [43][44][45][46]). But the EWs in a laminate glued by a thin soft film were not yet investigated.…”

Section: Properties Of Other Guided Waves In Laminates With Soft Inte...mentioning

confidence: 97%

“…Therefore, we have to determine 5 parameters: E 2 , ν 2 , ρ 2 , ξ 1 , ξ 3 . This problem is equivalent to the evaluation of parameters ξ eff 1 , ξ eff 3 , ν 2 , ρ 2 , ξ eff 1,0 entering in EBCs ( 44) and (45). At the first step, we calculate SCs with material parameters of a film, which is expected to be similar to the one used in the experiment (e.g., the two-side epoxy tape from the Table 1), using both the exact three layer model and the zero-order EBCs (48).…”

Section: Analysis Of the Influence Of The Film Parameters On The Basi...mentioning

confidence: 99%

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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: Properties Of Other Guided Waves In Laminates With Soft Inte...mentioning

confidence: 97%

Section: Analysis Of the Influence Of The Film Parameters On The Basi...mentioning

confidence: 99%

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

2022

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show abstract

“…However, due to the "global" nature of these approaches, their applicability for the characterization of certain structural parts, especially in large-scale engineering assemblies, might be restrained. Meanwhile, methods relying on ultrasonic guided waves (UGWs) provide an appropriate compromise between "global" and "local" structural evaluation and thus might serve as a suitable basis for corresponding non-destructive testing and structural health monitoring applications [3][4][5][6][7][8]. UGWs are multi-modal waves and using them for material properties identification often requires laborious signal processing.…”

Section: Introductionmentioning

confidence: 99%

Improved Unsupervised Learning Method for Material Properties Identification Based on Mode Separation of Ultrasonic Guided Waves

Golub¹,

Doroshenko²,

Arsenov³

et al. 2022

Preprint

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Numerical methods, including machine learning methods, are now actively used in the applications related to guided wave propagation. The method proposed in this study for material properties characterization is based on the algorithm of the clustering of multivariate data series obtained as a result of the application of the matrix pencil method to the experimental data. In the proposed technique, multi-objective optimization is employed to improve the accuracy of particular parameter identification. At the first stage, the computationally efficient method based on the calculation of the Fourier transform of Green's matrix is employed iteratively and the obtained solution is used for the filter construction with decreasing bandwidth, which allows us to obtain nearly noise-free classified data (with mode separation). The filter provides data separation between all guided waves in a natural way, which is needed at the second stage, where the slower method based on the minimization of the slowness residuals is applied to the data. The method might be applied for material properties identification in plates with thin coatings/interlayers, multi-layered anisotropic laminates etc.

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“…In this case, the plate can support one more type of 452 GWs -edge waves (EWs), propagating along the edge x 2 = 0 in x 1 direction and 453 exponentially decaying as x 2 → −∞. These waves were intensively studied theoretically 454 (see the overview [42] and the references therein), in the recent time their existence and 455 properties were confirmed in several experimental studies [43][44][45][46]). But the EWs in a 456 laminate glued by a thin soft film were not yet investigated.…”

mentioning

confidence: 97%

“…) containing only two ones. As one can see from(44)(45)(46)(47), the parameters ν 2 , ρ 2 arise 348 only in the higher-order asymptotic approximations. It means that their estimation from the 363 366 By comparing the results, we can find region Z \ A in the slowness-frequency domain,367where the SCs are well described, when using zero-order EBCs (see Figures 12a and36813a).…”

mentioning

confidence: 99%

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

Wilde¹,

Golub²,

Eremin³

2022

Preprint

View full text Add to dashboard Cite

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

Damage detection with the fundamental mode of edge waves

Cited by 17 publications

References 25 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

Improved Unsupervised Learning Method for Material Properties Identification Based on Mode Separation of Ultrasonic Guided Waves

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

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