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
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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Journal ArticleDOI
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
Journal ArticleDOI
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
Prediction of mechanical properties of heavy forgings
TL;DR: In this article, the authors evaluated the minimum reduction of the cross-section of the forging, which still allows the required mechanical properties to be obtained, including yield stress, tensile strength and hardness.
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In-situ measurement of Ti-6Al-4V grain size distribution using laser-ultrasonic technique
Feng Dong,Feng Dong,Wang Xiaochen,Quan Yang,Huaqiang Liu,Huaqiang Liu,Dong Xu,Dong Xu,Sun Youzhao,Yanjie Zhang,Renjie Xue,Sridhar Krishnaswamy +11 more
TL;DR: In this paper, a two-wave mixing (TWM) interferometer was used to detect the frequency dependent attenuation of ultrasound after the signals were denoised using wavelet transform.
Journal ArticleDOI
Contribution of dislocation dipole structures to the acoustic nonlinearity
W. D. Cash,Wei Cai +1 more
TL;DR: In this article, the ultrasonic nonlinearity created by dislocations in crystals is investigated using two-dimensional dislocation dynamics (DD) simulations, and an analytic model of the acoustic non-linearity parameter, β, of an isolated dislocation dipole is derived using a quasi-static loading assumption.
Journal ArticleDOI
Rayleigh and Stochastic Scattering of Ultrasonic Waves in Steel
TL;DR: In this article, the authors measured the ultrasonic attenuation in SAE 4150 steel at various stages in its heat treatment and found that the attenuation is changed by changes in grain diameter and anisotropy.
Journal ArticleDOI
Kinetics of Normal Grain Growth Depending on the Size Distribution of Small Grains
TL;DR: In this paper, it was shown that a log-normal function is not a steady-state size distribution for normal grain growth with n ¼ 2, even though it may approximate experimental size distributions.