Theoretical approach of the characterization of gradients in elastic properties by acoustic microscopy

Nounah, Hassan; Cros, B.; Attal, J.

doi:10.1051/epjap:1999131

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…For example, at teen layers the velocity of Rayleigh mode is 3010.10 m/s and the error is about 0.34%. For a graded aluminum layer on the substrate of silica, for to have an error less than 1%, it should about twenty layers [4][5] [17]. This difference can be explained by the significant difference between the properties of the graded layer and those of substrate, in contrast to the Titanium alpha and Titanium where their properties are very close and the step of variation of the profile is weak, then, the continuity is assured only for several elementary layers.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

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Numerical Evaluation of the Effect of Gradient on Reflection Coefficient of Continuously Graded Layer

Markou¹,

Nounah²

2015

ijacsa

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Abstract-This paper presents a numerical model, based on transfer matrix method, for modeling the propagation of surface acoustic waves at the interface formed by the coupling liquid and a continuously inhomogeneous thin layer on a semi-infinite substrate. The tow-dimensional spectrum of reflection coefficient computed by this model, allows determining the modes which propagate at the studied interface, this model treats different profile of gradients, and the numerical results obtained show that the reflection coefficient is sensitive to the variation of these gradients.

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Section: Numerical Results and Discussionmentioning

confidence: 99%

“…For modeling FGMs, tow approaches are possible. The first assumed that the gradient is piecewise varying, and the FGM is slicing into finite homogeneous layers [4] [5]. The second approach assumed that the gradient is varying continuously between the tow basic material properties [6].…”

Section: Introductionmentioning

confidence: 99%

Numerical Evaluation of the Effect of Gradient on Reflection Coefficient of Continuously Graded Layer

Markou¹,

Nounah²

2015

ijacsa

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“…Mnari et al [140] have determined the Young's moduli of sprayed SnS 2 and SnO 2 , which have potential applications as photovoltaic materials. A theoretical approach to the characterization of gradients in elastic properties by AM has been developed by Nounah et al [141]…”

Section: Selected Resultsmentioning

confidence: 99%

Measurement of the near-surface elastic properties of solids and thin supported films

Every¹

2002

Meas. Sci. Technol.

105

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This paper provides an overview of the principal dynamical methods for measuring the elastic properties of the near-surface regions of solids and thin supported solid films. It concentrates on the most widely used surface/guided wave methods, namely surface Brillouin scattering (SBS), laser-generated surface acoustic waves (LSAW) and acoustic microscopy (AM), and emphasizes the common underlying principles shared by these three methods. It is shown how these methods obtain elastic properties and other information such as film thickness and density, by coupling into the various guided modes that exist at surfaces and in thin supported films, including Rayleigh surface waves, pseudo-surface waves, Sezawa modes and lateral waves. At the outset, a brief introduction is provided of surface and thin-film dynamics in the context of surface dynamic response functions and the reflectivity of sound incident on the surface through a fluid couplant. The main characteristics of the various guided modes and the features they give rise to in the surface response and reflectivity are discussed. Following this, there are individual sections devoted to each of the three principal methods. This article is aimed at providing the reader with a broad appreciation and basic understanding of SBS, LSAW and AM and the fundamental underlying principles they share. Numerous examples are given of recent applications of these methods to the elastic characterization of solid surfaces and thin supported films. Extensive references are provided to guide the reader to the literature on experimental details and methods of data interpretation and analysis, and to recent reported results.

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Impact of localized inhomogeneity on the surface-wave velocity and bulk-wave reflection in solids

2007

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Theoretical approach of the characterization of gradients in elastic properties by acoustic microscopy

Cited by 4 publications

References 7 publications

Numerical Evaluation of the Effect of Gradient on Reflection Coefficient of Continuously Graded Layer

Numerical Evaluation of the Effect of Gradient on Reflection Coefficient of Continuously Graded Layer

Measurement of the near-surface elastic properties of solids and thin supported films

Impact of localized inhomogeneity on the surface-wave velocity and bulk-wave reflection in solids

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