Authors:
Gilmar Nogueira (Univ. Grenoble Alpes, France),
Christophe Martin (Univ. Grenoble Alpes, France)
Abstract:
A DEM (Discrete Element Method) model is used to simulate compaction and sintering. A double-action die has been implemented for the compaction stage. The process kinematics are decomposed into loading, unloading, and ejection of the pellet. Interactions between the particles and the die are considered elastoplastic by implementing a large-density model. A qualitative approach is used in the sintering stage. The results are in good agreement with experimental data and FEM simulations from the literature, regarding density gradient, elastic spring-back, and final geometry. The simulations show that the friction coefficient is the primary factor for the density gradient in the pellet. This density gradient induces a non-homogeneous sintering, which results in a final geometry with a so-called diabolo effect. This is the first time that it has been reproduced by DEM with the advantage of more closely reproducing the particulate microstructure of the powder.
DOI:
https://doi.org/10.59499/WP225371412