采用团聚体法开展颗粒材料的压碎数值试验研究，对影响单颗粒破碎材料特性的细观参数进行了系统性的分析，揭示其对单颗粒破碎的细观影响机制，并为选取用于团聚体法颗粒破碎模拟的细观参数提供一定参考。研究中分别对影响颗粒材料特性的细观参数进行敏感性分析。研究表明：子颗粒黏结强度对单颗粒破碎影响显著，颗粒峰值破碎强度随其增加呈线性增长趋势。随子颗粒间摩擦系数增加，黏结键越难发生剪切破坏，单颗粒峰值破碎强度随之增大；局部阻尼系数能够抑制黏结键破坏形成的应力波，从而使团聚体黏结键破坏的空间分布发生改变，因此对团聚体破碎后的碎片尺寸分布和破碎机制有着显著的影响。
Abstract
The agglomeration method is used to simulate the single particle crushing test and the material parameters affecting the particle breakage behavior were systematically analyzed. This work aims to provide reference for the selection of material parameters used in the discrete element modeling of particle crushing. The simulation results show that the effect of bond strength on single particle crushing is most prominent, and the particle crushing strength increases linearly with the bond strength.With the increase of friction coefficient between sub-particles, the bond becomes more and more difficult under shear stress, which cause the particle crushing strength increases accordingly.The local damping coefficient can inhibit the stress wave formed by bond broken, thus changing the spatial distribution of the agglomerate’s broken bonds. Therefore, it has a significant impact on the fragment size distribution of the agglomerate.
关键词
颗粒破碎 /
单颗粒压碎 /
细观机理 /
团聚体法 /
敏感性分析
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Key words
particle breakage /
discrete element method /
microscopic mechanism /
agglomeration method /
sensitivity analysis
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