Compression and breakage behavior of γ-Al2O3 granules

The material behavior of dominant elastic–plastic, spherical γ-Al2O3-granules at compression until primary breakage has been experimentally studied. For this, the mechanical properties of the granules were determined using recorded force–displacement-curves. The influence of particle size and moisture content on the compression behavior has also been investigated. Additionally, the specific fracture energy distribution and the distribution of the equivalent impact velocity at fracture were derived from the force–displacement-curves. The work provides a basis for understanding the influence on the material behavior at wetting of hygroscopic and highly porous granules.

The material behavior of γ-Al2O3-granules at compression has been experimentally studied. Additionally, the influence of particle size and moisture content on the compression behavior has been investigated. The recorded force-displacement curves have been approximated using suitable mechanical models. Moreover, the specific fracture energy distribution and the distribution of the equivalent impact velocity at fracture were derived from the force-displacement curves.Figure optionsDownload as PowerPoint slideHighlights
► With increasing moisture content, the breakage force and fracture strength decrease.
► At wetting inner stresses arise and get released.
► With increasing particle size and moisture the specific breakage energy decreases.
► Due to wetting, a slightly bimodal material behavior can develop.