The flow and force chain characteristics of metal powder in high-velocity compaction are not fundamentally understood because of the complexities and discreteness of these particle systems. A 2D discrete element model of a metal powder subjected to uniaxial compaction is developed. The flow state of particles, the force chain distribution, and the influence of the main model parameters on the force chains are investigated. Results indicate a collisional particle flow stage at the beginning of compaction. Then, the flow state of particles can rapidly be classified as a dense particle flow. In addition, the contact force distribution for the collisional particle flow follows an exponential law, which is significantly different from that for dense particle flow. The probability distribution of contact forces changes as a power function in the dense particle flow. The force chains initially deviate in the y-axis direction and then in the x-axis direction with increasing friction coefficient, and the distribution and load-carrying rates of the weak force chains decrease with increasing friction coefficient. Moreover, the force chains deflect in the direction of the x-axis with increasing the particle diameter, and the distribution rate and load-carrying rate of the weak force chains decrease with increasing particle diameter. These changes in the direction of the force chains are similar to the density changes in the compacted blank part parts. The distribution rate and the load-carrying rate of the weak force chains decrease with increasing friction coefficient, and the density of the blank part depends on the direction of the entire force chains (vector sum of the force chains). Under the strength of the force chains with slight changes and when the entire force chains are inclined in the densification direction, the density of the compacted blank part increases.

由于这些颗粒系统的复杂性和离散性，在高速压实中金属粉末的流动和力链特性还没有从根本上理解。开发了经受单轴压制的金属粉末的二维离散元模型。研究了粒子的流动状态、力链分布以及主要模型参数对力链的影响。结果表明在压实开始时存在碰撞粒子流阶段。然后，粒子的流动状态可以迅速归类为稠密粒子流。此外，碰撞粒子流的接触力分布遵循指数规律，这与密集粒子流的接触力分布显着不同。接触力的概率分布作为密集粒子流中的幂函数而变化。力链最初在y轴方向，然后x轴方向随着摩擦系数的增加，弱力链的分布和承载率随着摩擦系数的增加而减小。此外，力链在x方向偏转轴随粒径的增大而减小，弱力链的分布率和承载率随粒径的增大而减小。力链方向的这些变化类似于压实的坯件零件的密度变化。弱力链的分布率和承载率随着摩擦系数的增加而减小，毛坯件的密度取决于整个力链的方向（力链的矢量和）。在力链强度略有变化的情况下，当整个力链向致密化方向倾斜时，压实坯件的密度增加。