Discrete Element Simulations of the Compaction of Aggregated Ceramic Powders

The compaction behavior of aggregated ceramic powders is investigated using the discrete element method (DEM). We use specific contact forces that represent bonds between primary particles to model aggregates. The bonds have the possibility to break when their strength is exceeded, hence reproducing the crushability of aggregates. The strength of individual aggregates has been investigated using compression between platens. A number of aggregates are then introduced in a periodic simulation box to model close‐die compaction. It is shown that the densification of the powder is mostly due to aggregate attrition and crushability, coupled with rearrangement. The effect of bond size, aggregate strength, and morphology on the powder macroscopic behavior is assessed.