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@article{Huang:2021:10.1121/10.0003955,
author = {Huang, M and Sha, G and Huthwaite, P and Rokhlin, S and Lowe, MJS},
doi = {10.1121/10.0003955},
journal = {Journal of the Acoustical Society of America},
pages = {2377--2394},
title = {Longitudinal wave attenuation in polycrystals with elongated grains: 3D numerical and analytical modeling},
url = {http://dx.doi.org/10.1121/10.0003955},
volume = {149},
year = {2021}
}

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TY  - JOUR
AB  - This work develops a second-order approximation (SOA) model and a three-dimensional (3D) finite element (FE) model to calculate scattering-induced attenuation for elastic wave propagation in polycrystals with elongated grains of arbitrary crystal symmetry. The SOA model accounts for some degree of multiple scattering, whereas the 3D FE model includes all scattering possibilities. The SOA model incorporates the accurate geometric two-point correlation function obtained from the FE material systems to enable comparative studies between the two models. Also, the analytical Rayleigh and stochastic asymptotes are presented to provide explicit insights into propagation behaviors. Quantitative agreement is found between the FE and analytical models for all evaluated cases. In particular, the FE simulations support the SOA model prediction that grain shape does not exert influence on attenuation in the Rayleigh regime and its effect emerges as frequency increases to the stochastic regime showing anisotropy in attenuation. This attenuation anisotropy intensifies with the increase in frequency, but it exhibits a complicated behavior as frequency transits into the geometric regime. Wavefield fluctuations captured from the FE simulations are provided to help observe these complex scattering behaviors. The proportionality of attenuation to elastic scattering factors is also quantitatively evaluated.
AU  - Huang,M
AU  - Sha,G
AU  - Huthwaite,P
AU  - Rokhlin,S
AU  - Lowe,MJS
DO  - 10.1121/10.0003955
EP  - 2394
PY  - 2021///
SN  - 0001-4966
SP  - 2377
TI  - Longitudinal wave attenuation in polycrystals with elongated grains: 3D numerical and analytical modeling
T2  - Journal of the Acoustical Society of America
UR  - http://dx.doi.org/10.1121/10.0003955
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000638093100002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://asa.scitation.org/doi/10.1121/10.0003955
UR  - http://hdl.handle.net/10044/1/88299
VL  - 149
ER  -

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