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Effect of the particle size ratio on the structural properties of granular mixtures with discrete particle size distribution

机译：粒径比对粒径分布离散的粒状混合物结构性能的影响

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In this study, the discrete element method was used to examine the structural properties and geometric anisotropy of poly-disperse granular packings with discrete uniform particle size distributions. Confined uniaxial compression was applied to granular mixtures with different particle size fractions. The particle size fraction (class) was defined as the fraction of the sample composed of particles with a certain size. The threshold value of number of particle size fractions (i.e., the value above which structural properties of assemblies remain constant) was determined. The effect of heterogeneity in particle size on the critical value of number of particle size fractions was investigated for packings with different ratios between diameters of the largest and smallest grains. The threshold number of particle size classes decreased from five to three as the diameter ratio between the largest and smallest grains increased. Regardless of the diameter ratio, the critical number of particle size fractions (above which the packing density and coordination number of the granular mixtures remained constant) was determined to be five. The study has also shown an increase in packing density of binary mixtures with particle size ratio increasing up to 2.5, which was followed by decrease in density of mixtures with larger particle size ratios, which has not so far been reported in the literature.
机译：在这项研究中，使用离散元素方法来检查具有离散的均匀粒度分布的多分散颗粒填料的结构特性和几何各向异性。将受限的单轴压缩应用于具有不同粒径分数的颗粒混合物。粒度分数（类别）定义为样品由一定尺寸的颗粒组成的分数。确定粒度分数数目的阈值（即，高于该值的组件的结构性能保持恒定）。对于在最大和最小晶粒的直径之间具有不同比率的填充物，研究了粒度不均匀性对粒度级数个数临界值的影响。随着最大和最小晶粒之间的直径比增加，粒度等级的阈值数量从五减少到三。不管直径比如何，将粒度分数的临界数（在其以上颗粒混合物的堆积密度和配位数保持恒定）确定为5。研究还表明，二元混合物的堆积密度会随着粒径比增加到2.5而增加，其次是粒径比更大的混合物的密度下降，这在文献中尚未见报道。

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