Micromechanics of breakage in sharp-edge particles using combined DEM and FEM--颗粒学报PARTICUOLOGY

Bagherzadeh-Khalkhali, A., Mirghasemi, A. A., & Mohammadi, S. (2008). Micromechanics of breakage in sharp-edge particles using combined DEM and FEM. Particuology, 6(5), 347–361. https://doi.org/10.1016/j.partic.2008.07.002

Micromechanics of breakage in sharp-edge particles using combined DEM and FEM

Ahad Bagherzadeh-Khalkhali^*, Ali Asghar Mirghasemi, Soheil Mohammadi

School of Civil Engineering, University College of Engineering, University of Tehran, P.O. Box 11155-4563, Tehran, Iran

10.1016/j.partic.2008.07.002

Volume 6, Issue 5, October 2008, Pages 347-361

Received 15 March 2008, Accepted 2 July 2008, Available online 21 September 2008.

E-mail: a_bagher_kh@Yahoo.com

Highlights

Abstract

By combining DEM (Discrete Element Method) and FEM (Finite Element Method), a model is established to simulate the breakage of two-dimensional sharp-edge particles, in which the simulated particles are assumed to have no cracks. Particles can, however, crush during different stages of the numerical analysis, if stress-based breakage criteria are fulfilled inside the particles. With this model, it is possible to study the influence of particle breakage on macro- and micro-mechanical behavior of simulated angular materials. Two series of tests, with and without breakable particles, are simulated under different confining pressures based on conditions of biaxial tests. The results, presented in terms of micromechanical behavior for different confining pressures, are compared with macroparameters. The influence of particle breakage on microstructure of sharp-edge materials is discussed and the related confining pressure effects are investigated. Breakage of particles in rockfill materials are shown to reduce the anisotropy coefficients of the samples and therefore their strength and dilation behaviors.

Graphical abstract

Keywords

DEM; FEM; Particle breakage; Rockfill; Micromechanics; Anisotropy; Confining pressure

文章导读