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
Experimental study of thermal degradation in ferritic Cr-Ni alloy steel plates using nonlinear Lamb waves
TL;DR: In this paper, the authors measured the thermal degradation in ferritic Cr-Ni alloy steel plates using the nonlinear effect of Lamb wave propagation and found that the measured acoustic nonlinearity increases due to the second phase precipitates in the early stage and decreases as a combined result of dislocation change and micro-void initiation in the material.
Journal ArticleDOI
Determination of precipitate nucleation and growth rates from ultrasonic harmonic generation
John H. Cantrell,William T. Yost +1 more
TL;DR: In this article, an analytical model based on precipitate-dislocation interactions is presented that predicts a decrease in ultrasonic harmonic generation during the nucleation of precipitates and an increase during precipitate growth up to the point of precipitatematrix coherency loss.
Journal ArticleDOI
Creep damage characterization using non-linear ultrasonic techniques
TL;DR: In this article, the use of non-linear ultrasonic techniques for the characterization of material degradation in 99.98% pure copper due to high-temperature creep was described, where flat dog-bone-shaped specimens were subjected to constant load creep testing at different stress and temperature levels.
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Effect of Prior Austenite Grain Size on the Morphology and Mechanical Properties of Martensite in Medium Carbon Steel
TL;DR: In this article, the effect of the prior austenite grain size on the morphology of the martensite microstructure was studied and the results showed that within the typical industrial application of temperature and holding time set up, as holding time or the temperature increases, the prior Austenite average diameter increases.
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Application of ultrasonic methods for early detection of thermal damage in 2205 duplex stainless steel
TL;DR: In this article, the nonlinear ultrasonic measurements are performed and their results are compared with those from ultrasonic velocity and attenuation measurements for early detection of thermal degradation of mechanical properties in 2205 duplex stainless steel.