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Localized Densification during the Stage II–III Transition ‐ Compaction Efficiency at High Pressures
Author(s) -
Nam Jin,
Lannutti John J.
Publication year - 2004
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2004.00557.x
Subject(s) - compaction , microscale chemistry , materials science , stage (stratigraphy) , composite material , computed tomography , geology , paleontology , mathematics education , mathematics , medicine , radiology
Localized densification and compaction efficiency at high pressures was studied using X‐ray computed tomography. Stage III begins with the initiation of a region of uniform average density within the overall high‐density zone. No further densification occurs in this region; additional pressure is transmitted into adjacent, less‐dense zones and the die wall. This localized increase in wall friction continuously decreases compaction efficiency. Discrete element modeling was used to visualize force transfer. The transition was governed by events that ranged from the microscale to the macroscale. Terapascal levels of pressure were required to produce a uniform compact.