Effect of particle polydispersity on micromechanical properties and energy dissipation in granular mixtures--颗粒学报PARTICUOLOGY

Wiącek, J., & Molenda, M. (2014). Effect of particle polydispersity on micromechanical properties and energy dissipation in granular mixtures. Particuology, 16, 91–99. https://doi.org/10.1016/j.partic.2013.11.006

Effect of particle polydispersity on micromechanical properties and energy dissipation in granular mixtures

Joanna Wiącek^*, Marek Molenda

Institute of Agrophysics, Polish Academy of Sciences, Doswiadczalna 4, 20-290 Lublin 27, Poland

10.1016/j.partic.2013.11.006

Volume 16, October 2014, Pages 91-99

Received 12 June 2013, Revised 4 November 2013, Accepted 6 November 2013, Available online 31 January 2014.

E-mail: jwiacek@ipan.lublin.pl; joannasyk@autograf.pl

Highlights

• The micromechanical properties of polydisperse granular media were investigated.

• Uniaxial compression test was modeled using discrete element method.

• Coordination number decreased with increasing the polydispersity of sphere assembly.

• Energy loss increased with increasing the standard deviation of particle mean diameter.

Abstract

A series of numerical tests was conducted to study the micromechanical properties and energy dissipation in polydisperse assemblies of spherical particles subjected to uniaxial compression. In general, distributed particle size assemblies with standard deviations ranging from 0% to 80% of the particle mean diameter were examined. The microscale analyses included the trace of the fabric tensor, magnitude and orientation of the contact forces, trace of stress, number of contacts and degree of mobilization of friction in contacts between particles. In polydisperse samples, the average coordination numbers were lower than in monodisperse assemblies, and the mobilization of friction was higher than in monodisperse assemblies due to the non-uniform spatial rearrangement of spheres in the samples and the smaller displacements of the particles. The effect of particle size heterogeneity on both the energy density and energy dissipation in systems was also investigated.

Graphical abstract

Keywords

Polydisperse packing; Discrete element method; Micromechanics; Energy dissipation

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