Multiscale Force Networks in Highly Polydisperse Granular Media

Numerical analysis of compression mechanics of highly polydisperse granular mixtures with different PSD-s

“…Polydispersity affects the rearrangement of the particles and the contact network in granular systems, thus resulting in different compaction characteristics of particulate materials and powders, which is important in the chemical and construction industries. The degree of particle size heterogeneity affects geometric aspects of the packing characteristics and the mechanism of transmission of contact forces in granular systems [3,11]. Voivret et al [3] observed that increasing the degree of disorder of granules and the participation of small particles in highly polydisperse mixtures resulted in a decrease in the total number of contacts.…”

“…The degree of particle size heterogeneity affects geometric aspects of the packing characteristics and the mechanism of transmission of contact forces in granular systems [3,11]. Voivret et al [3] observed that increasing the degree of disorder of granules and the participation of small particles in highly polydisperse mixtures resulted in a decrease in the total number of contacts. These authors observed no effect of particle size span on the internal friction angle in highly polydisperse granular media.…”

“…Material properties include density, stiffness and surface roughness, while the geometric properties of particles include their size, size distribution and shape. Each of these parameters has been found to determine the structure and the mechanical response of granular materials to external shear and compressive loads [1][2][3][4][5][6][7][8][9][10].…”

Microstructure and macroscopic properties of polydisperse systems of hard spheres

“…We do it by solving a system of four equations that matches the first four central scaled moments with the tridisperse system from Table 3.2. Central scaled moments are very simple for the uniform size distribution: 37) with M c 1 = 0, due to the definition:…”

“…In granular materials, the degree of polydispersity strongly influences their mechanical response to external loads during shear [37] or compaction [38][39][40], as well as segregation and flow behaviour during mixing [41,42] and discharge processes [43]. (Note that in Ref.…”