Sánchez-Arévalo F M, Tapia-McClung H, Pulos G, Zenit R
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Apartado Postal 70360, Ciudad Universitaria, Distrito Federal 04510, México.
Phys Rev E Stat Nonlin Soft Matter Phys. 2013 May;87(5):052210. doi: 10.1103/PhysRevE.87.052210. Epub 2013 May 31.
Experiments and simulations of the compaction force in a confined binary granular mixture column were conducted. We measured the resistance force encountered by a piston pushing a vertical granular mixture in this confined arrangement. Granular mixtures with two different particle sizes were considered; the size ratio and the size fraction were both varied. An important decrease of the compaction force was found for volumetric fractions between 15% and 40% and size ratios larger than 3. By conducting some supplementary discrete element simulations, we found that the force chain network is fractured and redistributed when small particles are present. Hence we argue that the reduction of compaction force results from the redistribution of force within the granular column.
我们对受限二元颗粒混合物柱中的压实力进行了实验和模拟。我们测量了在这种受限装置中活塞推动垂直颗粒混合物时所遇到的阻力。考虑了两种不同粒径的颗粒混合物；粒径比和粒径分数均有所变化。发现在体积分数介于15%至40%之间且粒径比大于3时，压实力会显著降低。通过进行一些补充的离散元模拟，我们发现当存在小颗粒时，力链网络会断裂并重新分布。因此，我们认为压实力的降低是由于颗粒柱内的力重新分布所致。
