Powder assembly simulation by particle dynamics method

Abstract

SUMMARYThe aim of the present study is to show that the developed particle dynamics method is able to describe important characteristics of powder assemblies. In the method, the interaction forces that are introduced between the particles are electrostatic attractive forces and elastic repulsive forces. Energy dissipation by friction at contact surfaces and damping during cohesive collision were also considered. Several numerical experiments on the angle of repose, packing and compaction are carried out. The initial position and the size of the particles are randomly distributed based on the Monte-Carlo method. The simulation results show that the method can be used to evaluate the effect of particle characteristics on flowability of powder assemblies.

Comparison of various plasticity models for metal powder compaction processes

“…For porous materials, a general yield criterion of the form (2) has been proposed under the assumption of associative plasticity [3,[8][9][10][11][12][13][14][15].…”

Simulation of Powder Behaviour during Compaction Based on Continuum and Discrete Modeling.

“…Aizawa et al have attempted simulation of compaction behaviour of powders basing on the similar idea [30]. Shima et al also have carried out simulation and investigating the effect of particle and inter-particle characteristics on the compaction behaviour [31,32]. In the case of two-dimensions, circular disks or cylinders are used as particles, while in three-dimensions, spheres are used.…”

“…The principle and method of simulation is similar to the ordi-nary DEM and described elsewhere in detail [31,32], and therefore, we will briefly describe them below. The inter-particles forces employed are as follows: a) Normal force at contact: When deformation of particles in contact with each other is small enough, Hertzian force given by (3 An assembly of spherical particles was generated with the aid of random numbers in a parallelepiped cell, and they were fallen by the gravity to be filled in the cell.…”

Constitutive Equation for Powder Compaction Incorporating Powder Characteristics.

“…However, since the densification is due not only to particle deformation but also inter-particle sliding as well, the value of o is not a function of only p; the particle size distribution is an important factor that controls particle deformation and inter-particle sliding and thus, parameter o . The detail would possibly be studied by simulation based on particulate modeling [35]. The S-ip relationships are shown in Fig.…”