Determining a representative element volume for DEM simulations of samples with non-circular particles  

作　　者：Peter Adesina Catherine O'Sullivan Tokio Morimoto Masahide Otsubo 

机构地区：[1]Dept.of Civil and Environmental Engineering,Imperial College London,South Kensington,London SW72AZ,UK [2]Institute of Industrial Science,The University of Tokyo,4-6-1 Komaba Meguro-ku,Tokyo 153-8505,Japan

出　　处：《Particuology》2022年第9期29-43,共15页颗粒学报（英文版）

基　　金：Peter Adesina's doctoral research is sponsored by the Commonwealth Scholarship Commission,UK and Imperial College London。

摘　　要：Numerical studies on the number of particles or system size required to attain a representative element volume(REV)for discrete element method(DEM)simulations of granular materials have almost always considered samples with spherical or circular particles.This study considers how many particles are needed to attain a REV for 2D samples of 2-disc cluster particles where the particle aspect ratio(AR)was systematically varied.Dense and loose assemblies of particles were simulated.The minimum REV was assessed both by considering the repeatability of static packing characteristics and the shearing behaviour in biaxial compression tests,and by investigating the effect of sample size on the measured characteris-tics and observed shearing behaviour.The repeatability of the data considered generally improved with increasing sample size.The packing characteristics of the dense samples were more repeatable suggest-ing that the minimum REV reduces with increasing packing density.The minimum REV was observed to be sensitive to the characteristic measured.Although the overall responses of the samples during shear deformation were similar irrespective of the sample sizes,the smaller the sample size,the higher the fluctuations observed in the responses.Analysis of the coefficient of variation of the fluctuations around the critical state stress ratio can provide insight as to whether a REV is attained.The particle AR influences the effect of sample size on shearing characteristics and thus the minimum number of particles required to attain a REV;this can be explained by the influence of AR on the number of contacts within the samples.

关 键 词：DEM Representative element volume Non-circular particles Particle shape Granular materials 

分 类 号：TB30[一般工业技术—材料科学与工程]