A special relation between Young’s modulus, Rayleigh-wave velocity, and Poisson’s ratio

Malischewsky, Peter G.; Tuan, Tran Thanh

doi:10.1121/1.3243464

Cited by 15 publications

(7 citation statements)

References 5 publications

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“…34 The value of RSAWs velocity depends primarily on the shear wave velocity, 35 therefore, RSAWs are related to the shear modulus and bulk modulus of elasticity through Poisson's ratio. 29,36 V(z) is sensitive to the presence of the variations in the microstructure and the related microelasticity that are mapped in a high intensity contrast, constructing a signature of the imaged materials. 26,14 Generally, the formation of V(z) curves for samples that involve soft tissues such as biological samples is influenced by the strong attenuation within these materials particularly at frequencies as high as 1 GHz.…”

Section: Resultsmentioning

confidence: 99%

Scanning Acoustic Microscopy Comparison of Descemet's Membrane Normal Tissue and Tissue With Fuchs' Endothelial Dystrophy

Mohamed

Perone

Brand

et al. 2018

Invest. Ophthalmol. Vis. Sci.

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PURPOSE. To describe the application of scanning acoustic microscopy in the GHz-range (GHz-SAM) for qualitative imaging and quantitative characterization of the micromechanical properties of the Descemet's membrane and endothelial cells of cornea tissue. METHODS. Investigated were samples of a normal tissue and a tissue with Fuchs' endothelial dystrophy (FECD, cornea Guttata). Descemet's membranes were fixed on glass substrates and imaged utilizing a focused acoustic lens operating at a center frequency of 1 GHz. RESULTS. GHz-SAM data, based on the well-established V(z) technique, revealed discrepancies in the velocity of the propagation of Rayleigh surface acoustic waves (RSAW). RSAW were found to be slower in glass substrates with FECD samples than in the same glass substrates (soda-lime) with normal Descemet membrane, which indicates lower shear and bulk moduli of elasticity in tissues affected by FECD. CONCLUSIONS. Noninvasive/nondestructive GHz-SAM, is utilized in this study for the imaging and characterization of Descemet membranes, fixated on glass substrates. V(z) signatures containing sufficient oscillations were obtained for the system of Descemet membranes on glass substrates. The observed variation in the microelastic properties indicates potential for further investigations with GHz-SAM based on the V(z) technique.

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Section: Resultsmentioning

confidence: 99%

Scanning Acoustic Microscopy Comparison of Descemet's Membrane Normal Tissue and Tissue With Fuchs' Endothelial Dystrophy

Mohamed

Perone

Brand

et al. 2018

Invest. Ophthalmol. Vis. Sci.

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“…Parameter

is a typical linear ultrasonic property that describes how the arrival time of the propagating ultrasonic wave in the material varies [ 34 ]. It directly correlates to the material density and linear elastic properties of the material that are affected by the porosity content and distribution [ 35 ], and the grain size and texture [ 30 ] and can be obtained as [ 36 ]:

where

is the ultrasonic propagation distance and

is the arrival time of the ultrasonic wave.…”

Section: Description Of Ultrasonic Velocity Attenuation and Nonlinear...mentioning

confidence: 99%

Microstructural Characterization of Additively Manufactured Metal Components Using Linear and Nonlinear Ultrasonic Techniques

et al. 2022

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Metal additive manufacturing (AM) is an innovative manufacturing technology that uses a high-power laser for the layer-by-layer production of metal components. Despite many achievements in the field of AM, few studies have focused on the nondestructive characterization of microstructures, such as grain size and porosity. In this study, various microstructures of additively manufactured metal components were characterized non-destructively using linear/nonlinear ultrasonic techniques. The contributions of this study are as follows: (1) presenting correlation analyses of various microstructures (grain size and texture, lack of fusion, and porosity) and ultrasonic properties (ultrasonic velocity, attenuation, and nonlinearity parameters), (2) development of nondestructive microstructural characterization techniques for additively manufactured components; and (3) exploring the potential for the online monitoring of AM processes owing to the nondestructive nature of the proposed technique. The performance of the proposed technique was validated using additively manufactured samples under varying laser beam speed conditions. The characteristics of the target microstructures characterized using the proposed technique were consistent with the results obtained using destructive optical microscopy and electron back-scattered diffraction methods.

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“…In Table 2, the best fitting parameters, together with their least-squares uncertainties, are listed. Via the relations c T = c R (1 + ν)/(0.862 + 1.14ν) and E = 2ρc 2 T (1 + ν) [43,44], the Young's modulus E 1 and E 2 of the coating and substrate materials, respectively, were derived. For Poisson's ratio, have used ad hoc a value of 0.3, which is roughly equal to the value of T91 steel [1,42] and of FeCrAlY [45]).…”

Section: Local Acoustic Dispersion Curve Of Gesa Modified Samplementioning

confidence: 99%

Remote Thermoelastic Characterization of Candidate Structural and Protective Coatings for Lead-Bismuth Eutectic Cooled Nuclear Reactors

et al. 2019

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A laser ultrasonics approach to remotely characterize the elastic and thermal properties of a coating-substrate structure, used to protect fuel claddings in lead-bismuth eutectic cooled nuclear reactors, is presented and validated with experimental results. A transient grating geometry is used for multiple wavelength excitation of thermoelastic displacements, and laser beam deflection for detection. The value of Young’s modulus of the coating layer as calculated from the coating’s Rayleigh velocity of 190 ± 50 GPa is in accordance with a nano-indentation measurement. Using a priori knowledge concerning the density and elastic parameters of the coating and substrate, scanning the sample allows the obtaining of a coating thickness map in a fully remote, all-optical way, with an accuracy of about 4 microns for a coating of around 20-micron average thickness. Analyzing the transient thermal grating decay yields a thermal diffusivity value of ( 5.0 ± 1.6 ) × 10 − 6 m 2 /s, in the range of low-carbon steels. The consistency of the results infers that the all-optical laser ultrasonics approach should be feasible for remote inspection of the quality of optically rough coated claddings in the harsh environment of a nuclear reactor.

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A special relation between Young’s modulus, Rayleigh-wave velocity, and Poisson’s ratio

Cited by 15 publications

References 5 publications

Scanning Acoustic Microscopy Comparison of Descemet's Membrane Normal Tissue and Tissue With Fuchs' Endothelial Dystrophy

Scanning Acoustic Microscopy Comparison of Descemet's Membrane Normal Tissue and Tissue With Fuchs' Endothelial Dystrophy

Microstructural Characterization of Additively Manufactured Metal Components Using Linear and Nonlinear Ultrasonic Techniques

Remote Thermoelastic Characterization of Candidate Structural and Protective Coatings for Lead-Bismuth Eutectic Cooled Nuclear Reactors

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