Journal ArticleDOI
Effect of grain size distribution on the acoustic nonlinearity parameter
Saju T. Abraham,S. Shivaprasad,C. R. Das,Shaju K. Albert,B. Venkatraman,Krishnan Balasubramaniam +5 more
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TLDR
In this paper, the effect of grain size distribution on the measured acoustic nonlinearity of polycrystalline engineering materials is investigated, and the results predict that the existing models that account for only the mean grain size when characterizing material degradations need to be modified more comprehensively to include the role of grain sizes distribution.Abstract:
The effect of grain size distribution on the measured acoustic nonlinearity of polycrystalline engineering materials is investigated. Results are provided for two austenitic stainless steel materials with comparable mean grain sizes and distinct distribution widths assuming equiaxed grains and random crystallographic orientation. The distribution width is shown to influence the nonlinearity parameter considerably. On the material with a wider distribution, a reduced nonlinearity was noted, and comparable trends were also noted for different frequencies investigated. The results predict that the existing models that account for only the mean grain size when characterizing material degradations need to be modified more comprehensively to include the role of grain size distribution.read more
Citations
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Application of Rayleigh wave-based nonlinearity parameter to estimate the remnant useful life of fatigued thick aluminum plates
TL;DR: In this paper, Rayleigh waves are propagated through a thick aluminum (Al) plate to evaluate its material nonlinearity based on the second harmonic produced in the response, and numerical simulations are carried out on the pristine and fatigued thick Al specimens, and an amplitude-based Rayleigh wave nonlinear parameter is used to characterize the material non-linearity.
Journal ArticleDOI
Von Kármán spatial correlation function to describe wave propagation in polycrystalline media
TL;DR: The von Kármán function is shown to be more accurate than the exponential function and more tractable than the sum of exponentials form and the impact of the SCF on wave propagation and scattering is studied.
Journal ArticleDOI
Characterization of Grain Size in 316L Stainless Steel Using the Attenuation of Rayleigh Wave Measured by Air-Coupled Transducer
TL;DR: In this paper, the attenuation coefficient of Rayleigh waves is introduced to characterize grain size in heat treated 316L stainless steel, and the measured results are efficient, more stable and less influenced by the surface state when an air-coupled receiver is used.
Journal ArticleDOI
Elastic and thermodynamic properties of cerium‐doped yttrium aluminum garnets
Vitaliy G. Goncharov,Nian Wei,Nian Wei,Miu Lun Lau,Sue M. Ennaceur,Albert Migliori,Hongwu Xu,Min Long,Xiaofeng Guo +8 more
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Autonomous characterization of grain size distribution using nonlinear Lamb waves based on deep learning.
TL;DR: In this article , an explainable nonlinearity-aware multilevel wavelet decomposition-multichannel one-dimensional convolutional neural network is proposed to hierarchically extract multi-level time-frequency features of the acoustic non-linearity and automatically model latent nonlinear dynamics directly from the nonlinear ultrasonic responses.
References
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Journal ArticleDOI
Crystalline structure and symmetry dependence of acoustic nonlinearity parameters
TL;DR: In this article, a quantitative measure of elastic wave nonlinearity in crystals is provided by the acoustic non-linearity parameters, defined for arbitrary propagation modes for solids of arbitrary crystalline symmetry and are determined along the pure mode propagation directions for 33 crystals of cubic symmetry from data reported in the literature.
Journal ArticleDOI
The effect of grain size distribution on the frequency dependence of the ultrasonic attenuation in polycrystalline materials
TL;DR: In this article, an expression for the effect of the grain size distribution in polycrystalline materials on the frequency dependence of the ultrasonic attenuation was derived and validated using experimental data.
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Experimental investigation of nonlinear acoustic effect at crack
Tae-Hun Lee,Kyung-Young Jhang +1 more
TL;DR: In this paper, the nonlinear acoustic effect at a real crack was investigated experimentally using contact PZT transducers, which was able to keep all equipments and their set-up conditions consistent and thus enabled a reliable measurement of nonlinear parameter.
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Determination of the nonlinear ultrasonic parameter ? using a Michelson interferometer
Donna C. Hurley,C M Fortunko +1 more
TL;DR: In this paper, an accurate optical technique for determining the nonlinear ultrasonic parameter was described using a path-stabilized Michelson laser interferometer, in contrast to more conventional methods which use piezoelectric or capacitive detectors.
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Ultrasonic attenuation of polycrystalline materials with a distribution of grain sizes.
TL;DR: Grain size distribution is discussed within the context of previous attenuation models valid for arbitrary crystallite symmetries and is anticipated to play an important role in microstructural characterization research associated with ultrasonic scattering.