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Microstructure Development During Compaction of Granular Systems

Granular materials are the second most manipulated materials in industry today. They are easy to transport and more suitable than most other materials for the processing of a wide range of modern and traditional materials. Having a better understanding of the microstructure development and evolution during the compaction of granular systems will enable better design and control of the manufacturing process. Modeling this process requires a particle mechanics approach to describe each individual particle in the powder bed and to determine inter-particle contact forces and deformations. A first step in the direction of formulating a predictive model is restricting attention to elastic deformations—that is, using the Hertz contact law for small deformations and a nonlocal contact elastic formulation for moderate deformations and high levels of particle confinement. Nonlocal contact formulations remain predictive at high levels of confinement, or low porosity, by removing the classical assumption that contacts between particles are formulated locally as independent pair interactions.