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    Penetration in bimodal, polydisperse granular material

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    PhysRevE.94.052902.pdf
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    Type
    Article
    Authors
    Kouraytem, Nadia cc
    Thoroddsen, Sigurdur T cc
    Marston, J. O.
    KAUST Department
    High-Speed Fluids Imaging Laboratory
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    FCC/1/1975
    Date
    2016-11-07
    Permanent link to this record
    http://hdl.handle.net/10754/621920
    
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    Abstract
    We investigate the impact penetration of spheres into granular media which are compositions of two discrete size ranges, thus creating a polydisperse bimodal material. We examine the penetration depth as a function of the composition (volume fractions of the respective sizes) and impact speed. Penetration depths were found to vary between delta = 0.5D(0) and delta = 7D(0), which, for mono-modal media only, could be correlated in terms of the total drop height, H = h + delta, as in previous studies, by incorporating correction factors for the packing fraction. Bimodal data can only be collapsed by deriving a critical packing fraction for each mass fraction. The data for the mixed grains exhibit a surprising lubricating effect, which was most significant when the finest grains [d(s) similar to O(30) mu m] were added to the larger particles [d(l) similar to O(200 - 500) mu m], with a size ratio, epsilon = d(l)/d(s), larger than 3 and mass fractions over 25%, despite the increased packing fraction. We postulate that the small grains get between the large grains and reduce their intergrain friction, only when their mass fraction is sufficiently large to prevent them from simply rattling in the voids between the large particles. This is supported by our experimental observations of the largest lubrication effect produced by adding small glass beads to a bed of large sand particles with rough surfaces.
    Citation
    Kouraytem N, Thoroddsen ST, Marston JO (2016) Penetration in bimodal, polydisperse granular material. Physical Review E 94. Available: http://dx.doi.org/10.1103/PhysRevE.94.052902.
    Sponsors
    The research described herein was partially funded by KAUST. We acknowledge the financial support from CCRC at KAUST, Extreme Combustion FCC/1/1975.
    Publisher
    American Physical Society (APS)
    Journal
    Physical Review E
    DOI
    10.1103/PhysRevE.94.052902
    Additional Links
    http://journals.aps.org/pre/abstract/10.1103/PhysRevE.94.052902
    ae974a485f413a2113503eed53cd6c53
    10.1103/PhysRevE.94.052902
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program

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