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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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
A study on precipitation characteristics induced strength variation by nonlinear ultrasonic parameter
TL;DR: In this paper, the second order nonlinear ultrasonic (NLU) parameter scales with strength property that in turn depends on coherent to incoherent precipitation phase transition, and the observed variations in NLU parameter have been explained by modifying an existing dislocation-coherent precipitate interaction model for harmonics generation in order to account for a weaker dislocationsemicoherent precipitation interaction.
Journal ArticleDOI
Receiver calibration and the nonlinearity parameter measurement of thick solid samples with diffraction and attenuation corrections.
TL;DR: Analytical and experimental techniques for accurate determination of the nonlinearity parameter of solids in thick solid samples are presented and the proposed technique is validated through the &bgr; measurements of thickSolid samples.
Journal ArticleDOI
Dependence of Grain Size on Mechanical Properties and Microstructures of High Manganese Austenitic Steel
TL;DR: In this paper, a high manganese austenitic steel Fe-25Mn-3Cr-3Al 0.3C-0.01N with grain sizes 2.2∼28.7μm was obtained by annealing the cold rolled sheet at temperature ranging from 700-°C to 1000°C.
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Characterization of microstructural changes during annealing of cold worked austenitic stainless steel using ultrasonic velocity measurements and correlation with mechanical properties
Madavan Vasudevan,P. Palanichamy +1 more
TL;DR: In this article, ultrasonic velocity measurements have been employed to characterize microstructural changes during annealing of cold worked Ti-modified austenitic stainless steel where precipitation of TiC is known to retard recrystallization.
Journal ArticleDOI
Statistical considerations on uniform grain size
C. Núñez,S. Domingo +1 more
TL;DR: In this article, the distribution of grain size was determined in four alloys: ferritic steel, austenitic steel, zinc, and ferrite-pearlitic steel using samples that can be considered as having uniform grain size (UGS).