The Discrete Element Method In High-speed Powder To Suppress Forming Simulation

High Velocity Compaction (HVC) is a new manufacturing technique for producing high-density and high-performance metallic powder material with low costs. First,the current investigation situation and fundamental principles of HVC and Distinct Element Method (DEM) are introduced in this paper. And, based on the fundamental principles of two-dimensional rigid DEM, this paper has done some exploratory researches on the flow pattern of loose powder in HVC.Firstly, the technical principle of HVC and the basic theory of DEM block model are introduced. On the assumption that the shape of elements is Arbitrary Polygon formed by different number of triangles with different size ,the block model has been improved.The generating equation and the calculation method of contact force have been given correspondingly.Secondly, according to the law of force-displacement,calculation methods of normal and tangential contact forceΔF_n,ΔF_s in the two-dimensional disc model are discussed. Supposed that the momentum and kinetic energy change homogeneously, and combined with the momentum conservation and kinetic energy conservation laws, the external force to powder has been computed in HVC according to its techniques. This work has lay a foundation for the next simulation.Finally, with the help of DEM's computing software Particle Flow Code (PFC) ,the course of HVC has been simulated,and its correlative parameters is also analyzed. The two-dimensional rigid disc model is adopted in this simulation. Besides that, the flow patterns of loose powder at different locations on different stages of HVC have been discussed as well.