Discrete simulations: from powder densification to effective properties
C. L Martin, D. Jauffrès, P. Lhuissier, D. Bouvard ,L. Salvo
Discrete Element Method (DEM) simulations at the length scale of particles are a powerful tool to investigate the link between microstructure and properties of particulate materials. At GPM2, we focus on DEM simulations dedicated to materials sciences with an in-house code (dp3D). The aim is to model powder processes (compaction, sintering) and to optimize the microstructure of powder-based materials. New developments with the open-source code LIGGGHTS are also under way.
PhD and post-docs: A. Burr, R. Gibaud, W. Goncalves, E. Guesnet, P. Parant, D. Roussel, T. Reynier, B. Salques, Z. Yan Collaborations : University of Washington, Clemson University, Forschungszentrum Jülich Institute of Energy and Climate Research, ESRF The European Synchrotron, CEA Projects: OPTIMA_SOFC, Funmat
DEM simulations work at the particle length scale, thus allowing a pertinent modelling of particulate materials such as powders. The objective is to use these simulations to:
Model powder processes such as compaction and sintering with special attention to the microstructure and its link to defect initiation.
Optimize microstructure to ensure structural or functional properties.
The crushingof spherical agglomerates was simulated with quantitative comparison with experiments under SEM. Crushing strength of agglomerates and aggregates can be simulated with close link to the internal structure (porosity, defects, calcination extent, …). The close-die compaction of several agglomerates can be simulated and the resulting microstructure passed to the sintering stage of the simulation code.
Sintering of complex microstructures such as composites, multilayers and powders with pore formers is tackled with DEM. For example, the constrained sintering of multilayered structures was simulated with special attention to the initiation of defects.
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