Abstract
In this paper, three basic hypotheses are proposed, regarding the effects of porosity and work hardening on powder compaction for building a new pressure-density relation. After a short validation on some hard powders, complementary hypotheses are used for generalising the density description as a function of hydrostatic pressure and deviatory stress. The model is then tested using triaxial characterisations from another author. Lastly, it is shown that the modelling parameters, to which a physical meaning is given, can be determined from two simple experiments, such as isostatic compaction and die pressing. This represents a drastic saving in time for characterising the compaction behaviour of hard powder.
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