3D Numerical Simulation of Aluminum Powders under Impact Loading Based on Discrete Element Method

Abstract

Abstract: A 3D discrete element software PFC3D was applied to simulate the impact loading of metal powders under 3D conditions，based on the discrete element method.The simulation results were verified by split Hopkinson pressure bar experiments.In addition，movement of particles in the compaction processes was analyzed，the velocity distribution of particles is irregular arcs，and there is a distribution gradient.When the impact occurred，the particles were rearranged mainly by transverse movement，with the increase of particle velocity，the moving direction of the particles was gradually shifted downward.The vertical movement of the upper particles and the lateral rearrangement of the lower particles are the main causes of shearing between the particles.

Key words: impact compaction, metal powder, discrete element method, three-dimensional numerical simulation, Hopkinson bar

摘要： 基于离散单元法原理，应用三维离散元软件PFC3D对金属粉末的冲击加载过程进行了模拟，利用分离式霍普金森压杆实验验证了模拟结果。对压制过程中颗粒的运动情况进行了初步研究分析，发现颗粒的速度分布形状为不规则弧形，并存在分布梯度。刚受到冲击时，颗粒以横向移动为主进行重排，随着颗粒速度的增加，颗粒的运动方向逐渐向下偏移，以此规律，逐步传递。上部颗粒的垂直下移与下部颗粒的横向重排是颗粒间产生剪切的主要原因。

关键词: 冲击压制, 金属粉末, 离散单元法, 三维数值模拟, 霍普金森压杆

CLC Number:

TG391

LUO Xiaolong;LIU Jun;TIAN Shijun;LIN Li;ZHOU Chun. 3D Numerical Simulation of Aluminum Powders under Impact Loading Based on Discrete Element Method[J]. China Mechanical Engineering.

罗晓龙;刘军;田始军;林立;周纯. 基于离散单元法的铝粉冲击加载过程三维数值模拟[J]. 中国机械工程.

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