ORCID Profile
0000-0003-1652-635X
Current Organisation
Johns Hopkins University
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Publisher: The Open Journal
Date: 13-07-2020
DOI: 10.21105/JOSS.02286
Publisher: Proceedings of the National Academy of Sciences
Date: 29-06-2020
Abstract: Structure-property relations of granular materials are governed by the arrangement of particles and the chains of forces between them. These relations enable design of wave d ing materials and nondestructive testing technologies. Wave transmission in granular materials has been extensively studied and demonstrates rich features: power-law velocity scaling, dispersion, and attenuation. However, the precise roles of particle arrangements and force chains on these features remain topics of continued research interest. Here, we employ X-ray measurements and analyses to show that velocity scaling and dispersion arise from both particle arrangements and force chains, while attenuation arises mainly from particle arrangements.
Publisher: AIP Publishing
Date: 09-06-2021
DOI: 10.1063/5.0051642
Abstract: Understanding the particle-scale dynamics of granular materials during rapid compaction and flow is of fundamental importance for manufacturing, planetary science, geology, and defense applications. Time-resolved 2D radiography and static 3D x-ray tomography are powerful in situ tools for studying particle-scale dynamics but provide detail only in 2D or with significant time-scale limitations, respectively. Here, we introduce a new method that uses 2D in situ x-ray imaging for determining time-resolved 3D particle-scale dynamics in rapidly compressed granular materials. The method employs initial particle packing structures obtained from x-ray tomography, a 2D x-ray image generation algorithm, and an optimization algorithm. We first describe and validate the method using finite element simulations. We then apply the technique to x-ray phase-contrast images obtained during rapid compaction of granular materials with varying particle morphology and s le thickness. The depth-resolved particle-scale dynamics reveal complex velocity and porosity fields evolving heterogeneously along and perpendicular to the compaction direction. We characterize these features, their fluctuations near the compaction front, and the compaction front thickness. Our technique can be applied to understanding granular dynamics during rapid compaction events, and rearrangements during slower, but non-quasi-static, flows.
Publisher: Elsevier BV
Date: 08-2020
Publisher: Elsevier BV
Date: 08-2019
Publisher: Elsevier BV
Date: 04-2023
Location: United States of America
Location: United States of America
Location: United States of America
No related grants have been discovered for Ryan Hurley.