Volume 69
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Fang, C., Nie, Z., Gong, J., Li, B., Hu, W., & Mohammed, A. (2022). Discrete element simulation of effects of multicontact loading on single particle crushing. Particuology, 69, 49-60. https://doi.org/10.1016/j.partic.2021.11.012
Discrete element simulation of effects of multicontact loading on single particle crushing
Chuanfeng Fang a, Zhihong Nie a, Jian Gong b *, Bo Li c, Wei Hu d, Ashiru Mohammed a
a School of Civil Engineering, Central South University, Changsha 410075, China
b College of Civil of Engineering and Architecture, Guangxi University, Nanning, 530004, China
c College of Architecture and Civil Engineering, Wenzhou University, Wenzhou 325035, China
d Hunan Province Key Laboratory of Geotechnical Engineering Stability Control and Health Monitoring, Hunan University of Science and Technology, Xiangtan, 411201, China
10.1016/j.partic.2021.11.012
Volume 69, October 2022, Pages 49-60
Received 23 August 2021, Revised 4 November 2021, Accepted 30 November 2021, Available online 9 December 2021, Version of Record 21 December 2021.
E-mail: jiangong@gxu.edu.cn

Highlights

• Four particle crushing criteria under multicontact loading are quantitatively analyzed.

• The most suitable particle crushing criterion for judging particle breakage is extracted.

• The particle crushing pattern under multicontact loading is analyzed statistically.

• The effect of loading spatial distribution on crushing strength is qualitatively explored.


Abstract

Particle crushing commonly occurs in granular materials and affects their structures and mechanical properties. Unlike idealized particles in experimental single particle crushing tests with two loading points, natural particles are crushed under multicontact loading. To date, the criteria and patterns of particle crushing under multicontact conditions are not fully understood. By using the three-dimensional discrete element method, this report explores the effect of multicontact loading on the crushing criterion of a single particle, the crushing pattern, and the relationship between the particle crushing strength and loading distribution. The particles are modelled as aggregates of glued Voronoi polyhedra. The numerical results indicate that the logarithm of the mean principal stress has a good linear correlation with the coordination number. For a specific coordination number, the number of child particles presents a significant normal distribution. For a specific number of child particles, the volumes of child particles can be statistically described as normal or gamma distribution. Three typical models are proposed to qualitatively analyse the relationship between the loading distribution and crushing strength. The relevant conclusions can be helpful in engineering practice and in further studies on crushable granular materials via the discrete element method.

Graphical abstract
Keywords
DEM; Multiple contacts; Particle crushing; Crushing criterion; Crushing pattern; Loading distribution