运动物体在颗粒物质中的动力学过程及最大穿透深度仿真研究

利用离散元法仿真了运动物体在颗粒物质中的三维动力学过程, 仿真采用周期边界条件, 并考虑了重力、接触力、阻尼力、摩擦力的影响. 将仿真结果和相关的三维实验结果进行了对比, 两者符合较好. 仿真结果表明穿透深度与运动物体的冲击速度、运动物体质量、颗粒介质床的密度均有关系. 运动物体质量越大, 速度越快, 则穿透越深, 而且穿透深度和质量呈线性关系. 仿真过程较为真实地再现了小颗粒的飞溅现象. 关键词： 颗粒物质 动力学过程 仿真 离散元法

Simulation of the projectile dynamics in granular media

The three-dimensional (3D) dynamics of a projectile in granular media is simulated using DEM (discrete element method). Periodic boundary conditions are adopted, and the effects of gravity, contact forces, damping and friction are taken into account. The 3D simulation results fit the experiment results very well. Simulation results show that the heaver the projectile, the deeper the penetration depth. The impact depth grows linearly when the projectile quality increases. And when the density of granular media decreases, the penetration depth also increases. Splash of granular particles is also observed in the impact simulation.
Keywords： granular media dynamics simulation discrete element method