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The influence of packing structure and interparticle forces on ultrasound transmission in granular media

Ultrasound propagation through externally stressed, disordered granular materials was experimentally and numerically investigated. Experiments employed piezoelectric transducers to excite and detect longitudinal ultrasound waves of various frequencies traveling through randomly packed sapphire spher...

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Detalles Bibliográficos
Autores principales: Zhai, Chongpu, Herbold, Eric B., Hurley, Ryan C.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: National Academy of Sciences 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7368278/
https://www.ncbi.nlm.nih.gov/pubmed/32601178
http://dx.doi.org/10.1073/pnas.2004356117
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author Zhai, Chongpu
Herbold, Eric B.
Hurley, Ryan C.
author_facet Zhai, Chongpu
Herbold, Eric B.
Hurley, Ryan C.
author_sort Zhai, Chongpu
collection PubMed
description Ultrasound propagation through externally stressed, disordered granular materials was experimentally and numerically investigated. Experiments employed piezoelectric transducers to excite and detect longitudinal ultrasound waves of various frequencies traveling through randomly packed sapphire spheres subjected to uniaxial compression. The experiments featured in situ X-ray tomography and diffraction measurements of contact fabric, particle kinematics, average per-particle stress tensors, and interparticle forces. The experimentally measured packing configuration and inferred interparticle forces at different sample stresses were used to construct spring networks characterized by Hessian and damping matrices. The ultrasound responses of these network were simulated to investigate the origins of wave velocity, acoustic paths, dispersion, and attenuation. Results revealed that both packing structure and interparticle force heterogeneity played an important role in controlling wave velocity and dispersion, while packing structure alone quantitatively explained most of the observed wave attenuation. This research provides insight into time- and frequency-domain features of wave propagation in randomly packed granular materials, shedding light on the fundamental mechanisms controlling wave velocities, dispersion, and attenuation in such systems.
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spelling pubmed-73682782020-07-29 The influence of packing structure and interparticle forces on ultrasound transmission in granular media Zhai, Chongpu Herbold, Eric B. Hurley, Ryan C. Proc Natl Acad Sci U S A Physical Sciences Ultrasound propagation through externally stressed, disordered granular materials was experimentally and numerically investigated. Experiments employed piezoelectric transducers to excite and detect longitudinal ultrasound waves of various frequencies traveling through randomly packed sapphire spheres subjected to uniaxial compression. The experiments featured in situ X-ray tomography and diffraction measurements of contact fabric, particle kinematics, average per-particle stress tensors, and interparticle forces. The experimentally measured packing configuration and inferred interparticle forces at different sample stresses were used to construct spring networks characterized by Hessian and damping matrices. The ultrasound responses of these network were simulated to investigate the origins of wave velocity, acoustic paths, dispersion, and attenuation. Results revealed that both packing structure and interparticle force heterogeneity played an important role in controlling wave velocity and dispersion, while packing structure alone quantitatively explained most of the observed wave attenuation. This research provides insight into time- and frequency-domain features of wave propagation in randomly packed granular materials, shedding light on the fundamental mechanisms controlling wave velocities, dispersion, and attenuation in such systems. National Academy of Sciences 2020-07-14 2020-06-29 /pmc/articles/PMC7368278/ /pubmed/32601178 http://dx.doi.org/10.1073/pnas.2004356117 Text en Copyright © 2020 the Author(s). Published by PNAS. https://creativecommons.org/licenses/by-nc-nd/4.0/ https://creativecommons.org/licenses/by-nc-nd/4.0/This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND) (https://creativecommons.org/licenses/by-nc-nd/4.0/) .
spellingShingle Physical Sciences
Zhai, Chongpu
Herbold, Eric B.
Hurley, Ryan C.
The influence of packing structure and interparticle forces on ultrasound transmission in granular media
title The influence of packing structure and interparticle forces on ultrasound transmission in granular media
title_full The influence of packing structure and interparticle forces on ultrasound transmission in granular media
title_fullStr The influence of packing structure and interparticle forces on ultrasound transmission in granular media
title_full_unstemmed The influence of packing structure and interparticle forces on ultrasound transmission in granular media
title_short The influence of packing structure and interparticle forces on ultrasound transmission in granular media
title_sort influence of packing structure and interparticle forces on ultrasound transmission in granular media
topic Physical Sciences
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7368278/
https://www.ncbi.nlm.nih.gov/pubmed/32601178
http://dx.doi.org/10.1073/pnas.2004356117
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