Abstract
This paper presents numerical studies of powder compaction in cold uniaxial pressing. The powder compaction in this work is considered as an initial stage of a hot pressing process so it is realized with relatively low pressure (up to 50 MPa). Hence the attention has been focused on the densification mechanisms at this range of pressure and models suitable for these conditions. The discrete element method employing spherical particles has been used in the numerical studies. Numerical simulations have been performed for two different contact models—the elastic Hertz–Mindlin–Deresiewicz model and the plastic Storakers model. Numerical results have been compared with the results of laboratory tests of the die compaction of the NiAl powder. Comparisons have shown that the discrete element method is capable to represent properly the densification mechanisms by the particle rearrangement and particle deformation.
Highlights
Uniaxial pressing is one of the techniques of powder compaction and consolidation
The present work has been focused on the die compaction under a relatively low pressure
Experimental investigations of the die compaction of the nickel aluminide (NiAl) powder have been performed in order to provide data for validation of numerical models
Summary
Uniaxial pressing is one of the techniques of powder compaction and consolidation. The uniaxial pressing involves compaction of powder into a rigid die by applying pressure. The discrete element method allows us to model interaction of very large collections of particles. The powder compaction modelling in the present work is viewed upon as a preliminary step in simulation of the whole hot pressing process in which the stage of uniaxial pressing is followed by the stage of pressure assisted sintering. The discrete element method has been used to model the powder sintering [9,12,14,19,32] Most of these works, consider the unconstrained sintering in which there is no additional pressure. The present work is aimed to investigate the basic assumptions for the contact model of the powder compaction within a pressure range typical for the hot pressing.
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