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Anisotropic Plate

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Michel Bruneau – One of the best experts on this subject based on the ideXlab platform.

  • Lamb wave attenuation in a rough Plate. I. Analytical and experimental results in an Anisotropic Plate
    Journal of Applied Physics, 2008
    Co-Authors: Catherine Potel, D. Leduc, B. Morvan, Claude Depollier, Anne-christine Hladky-hennion, J.-l. Izbicki, P. Pareige, Michel Bruneau

    Abstract:

    Abstract : The characterization of bounded roughened surfaces before applying adhesive joint, in order to detect poor cohesive and adhesive properties, remains difficult. Earlier studies based on analysis of surface wave (Rayleigh waves or Scholte waves) are not really adapted to the characterization of such surfaces. Guided acoustic waves, i.e. Lamb waves, turn out to be the best adapted kind of waves to characterize this roughness when Plates are bounded together. It is the aim of this paper to provide analytical and experimental approaches to analyse the behaviour of Lamb waves propagating inside Plates with a rough surface (small perturbations). Firstly experimental results of the attenuation effects are given on roughened glass Plates; secondly the attenuation factor of the Lamb wave in an Anisotropic rough solid Plate is calculated through a complex analytical model of the dispersion equation which accounts for the effect of the Power Spectrum Density (PSD) of the rough profile (including the effect of the statistical roughness parameters).

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  • lamb wave attenuation in a rough Plate i analytical and experimental results in an Anisotropic Plate
    Journal of Applied Physics, 2008
    Co-Authors: Catherine Potel, D. Leduc, B. Morvan, Claude Depollier, J.-l. Izbicki, P. Pareige, A C Hladkyhennion, Michel Bruneau

    Abstract:

    The characterization of bounded roughened surfaces before applying adhesive joint, in order to detect poor cohesive and adhesive properties, remains difficult. Earlier studies based on analysis of surface wave (Rayleigh waves or Scholte waves) are not really adapted to the characterization of such surfaces. Guided acoustic waves, i.e., Lamb waves, turn out to be the best adapted kind of waves to characterize this roughness when Plates are bounded together. It is the aim of this paper to provide analytical and experimental approaches to analyze the behavior of Lamb waves propagating inside Plates with a rough surface (small perturbations). First, experimental results of the attenuation effects are given on roughened glass Plates. Second, the attenuation factor of the Lamb wave in an Anisotropic rough solid Plate is calculated through a complex analytical model of the dispersion equation which accounts for the effect of the power spectrum density of the rough profile (including the effect of the statistical…

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Tribikram Kundu – One of the best experts on this subject based on the ideXlab platform.

  • Acoustic source localization in a highly Anisotropic Plate with unknown orientation of its axes of symmetry and material properties with numerical verification
    Ultrasonics, 2019
    Co-Authors: Novonil Sen, Tribikram Kundu

    Abstract:

    Abstract Development of acoustic source localization techniques in Anisotropic Plates has gained attention in the recent past and still has scope of improvement. Most of such techniques existing in the literature either require known material properties or assume a straight line propagation of wave energy from the acoustic source to a sensor. These limitations have been overcome in recent years by employing wave front shape-based techniques. However, the existing wave front shape-based techniques are applicable in situations where the orientation of the axes of symmetry of the Anisotropic Plate is known beforehand. In the present study, a modified version of these techniques, namely, elliptical and parametric curve-based techniques, is proposed. This new version is useful when the angle between the axes of symmetry and the reference Cartesian coordinate system is unknown. In the new definition of the objective function, the orientation of the axes of symmetry of the Anisotropic Plate is treated as an input in the objective function in addition to the other unknowns like the source coordinates and the curve parameters. A numerical study illustrates how the modified new techniques can localize the acoustic source with sufficient accuracy in an Anisotropic Plate with unknown orientation of the axes of symmetry and its material properties.

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  • Acoustic source localization in heterogeneous media.
    Ultrasonics, 2019
    Co-Authors: Jia Fu, Tribikram Kundu

    Abstract:

    Abstract Acoustic source localization (ASL) or predicting the location of the acoustic source in a structure by analyzing the recorded signals at the receivers is of considerable interest for various applications. Recent research advances on this topic have been limited to homogeneous media. This paper presents a solution for acoustic source localization in a heterogeneous medium without knowing the properties of different materials constituting the heterogeneous structure. In this paper new developments for acoustic source localization in an Anisotropic Plate is first reviewed briefly. Then an ASL technique is presented for localizing acoustic source in heterogeneous layered structures when the layer properties are not known. The proposed technique is verified experimentally and numerically. The experimental results were generated with a specimen having one interface while numerical results were generated for both two-layered medium with one interface and three-layered medium with two interfaces.

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  • a new wave front shape based approach for acoustic source localization in an Anisotropic Plate without knowing its material properties
    Ultrasonics, 2018
    Co-Authors: Tribikram Kundu

    Abstract:

    Abstract Estimating the location of an acoustic source in a structure is an important step towards passive structural health monitoring. Techniques for localizing an acoustic source in isotropic structures are well developed in the literature. Development of similar techniques for Anisotropic structures, however, has gained attention only in the recent years and has a scope of further improvement. Most of the existing techniques for Anisotropic structures either assume a straight line wave propagation path between the source and an ultrasonic sensor or require the material properties to be known. This study considers different shapes of the wave front generated during an acoustic event and develops a methodology to localize the acoustic source in an Anisotropic Plate from those wave front shapes. An elliptical wave front shape-based technique was developed first, followed by the development of a parametric curve-based technique for non-elliptical wave front shapes. The source coordinates are obtained by minimizing an objective function. The proposed methodology does not assume a straight line wave propagation path and can predict the source location without any knowledge of the elastic properties of the material. A numerical study presented here illustrates how the proposed methodology can accurately estimate the source coordinates.

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Catherine Potel – One of the best experts on this subject based on the ideXlab platform.

  • Lamb wave attenuation in a rough Plate. I. Analytical and experimental results in an Anisotropic Plate
    Journal of Applied Physics, 2008
    Co-Authors: Catherine Potel, D. Leduc, B. Morvan, Claude Depollier, Anne-christine Hladky-hennion, J.-l. Izbicki, P. Pareige, Michel Bruneau

    Abstract:

    Abstract : The characterization of bounded roughened surfaces before applying adhesive joint, in order to detect poor cohesive and adhesive properties, remains difficult. Earlier studies based on analysis of surface wave (Rayleigh waves or Scholte waves) are not really adapted to the characterization of such surfaces. Guided acoustic waves, i.e. Lamb waves, turn out to be the best adapted kind of waves to characterize this roughness when Plates are bounded together. It is the aim of this paper to provide analytical and experimental approaches to analyse the behaviour of Lamb waves propagating inside Plates with a rough surface (small perturbations). Firstly experimental results of the attenuation effects are given on roughened glass Plates; secondly the attenuation factor of the Lamb wave in an Anisotropic rough solid Plate is calculated through a complex analytical model of the dispersion equation which accounts for the effect of the Power Spectrum Density (PSD) of the rough profile (including the effect of the statistical roughness parameters).

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  • lamb wave attenuation in a rough Plate i analytical and experimental results in an Anisotropic Plate
    Journal of Applied Physics, 2008
    Co-Authors: Catherine Potel, D. Leduc, B. Morvan, Claude Depollier, J.-l. Izbicki, P. Pareige, A C Hladkyhennion, Michel Bruneau

    Abstract:

    The characterization of bounded roughened surfaces before applying adhesive joint, in order to detect poor cohesive and adhesive properties, remains difficult. Earlier studies based on analysis of surface wave (Rayleigh waves or Scholte waves) are not really adapted to the characterization of such surfaces. Guided acoustic waves, i.e., Lamb waves, turn out to be the best adapted kind of waves to characterize this roughness when Plates are bounded together. It is the aim of this paper to provide analytical and experimental approaches to analyze the behavior of Lamb waves propagating inside Plates with a rough surface (small perturbations). First, experimental results of the attenuation effects are given on roughened glass Plates. Second, the attenuation factor of the Lamb wave in an Anisotropic rough solid Plate is calculated through a complex analytical model of the dispersion equation which accounts for the effect of the power spectrum density of the rough profile (including the effect of the statistical…

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