摘要：采用离散单元法,基于Hertz-Mindlin粘结接触模型,对2个球形颗粒在水平方向上的对心碰撞破碎过程进行数值模拟研究,分析相对速度及粒径比k为1.2、1.4、1.6对颗粒破碎行为的影响。结果表明:撞击速度较小时,颗粒碰撞后未破碎,但是内部出现局部粘结键的断裂,宏观表现为裂纹;随着撞击速度的增大,颗粒出现破裂或完全破碎;不同粒径比的2个颗粒碰撞时,小颗粒比大颗粒破碎严重,粒径比为1.6时,粒径较小的颗粒碰撞后获得的动量最大,粒径比为1.4时次之,粒径比为1.2时最小。

关键词：颗粒碰撞；破碎；离散单元法；数值模拟

Abstract: Using the discrete element method， the breaking process of central collision in horizontal direction between two spherical particles was simulated based on Hertz -Mindlin contact model. The effect of relative velocity and different diameter ratios of 1.2， 1.4 and 1.6 on particles breaking behavior were studied. The results show that at low impact velocity， the entire particles are not broken， but their interior bondings begin to fracture， which cause crack at the macro level. With the impact velocity increasing， the particles begin to fracture or be broken completely. When two particles with distinct diameter ratios impact each other， the smaller particle is broken more seriously than the larger one. When the diameter ratio is 1.6， the smaller one acquires the greatest momentum， the momentum with the diameter ratio of 1.4 takes the second place， and the momentum with the diameter ratio of 1.2 is the least. 

Keywords： particle impact；breakage；discrete element method；numerical simulation