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

作     者：Ahad Bagherzadeh-Khalkhali Ali Asghar Mirghasemi Soheil Mohammadi 

作者机构：School of Civil EngineeringUniversity College of EngineeringUniversity of Tehran 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2008年第6卷第5期

页      面：347-361页

核心收录：

学科分类：0817[工学-化学工程与技术] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0702[理学-物理学] 

主　　题：DEM FEM Particle breakage Rockfill Micromechanics Anisotropy Confining pressure 

摘      要：By combining DEM （Discrete Element Method） and FEM （Finite Element Method）, a model is established to simulate the breakage of twodimensional 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.