โ Scribed by I Sridhar; N.A Fleck; A.R Akisanya
No coin nor oath required. For personal study only.
The biaxial compaction of a square array of circular cylinders is studied using slip-line "eld, upper bound and "nite element methods. Densi"cation is assumed to occur by plastic deformation at the contacts. It is found that contact}contact interaction has a softening e!ect on the local indentation pressure at each contact. The yield surfaces resulting from hydrostatic and closed-die compaction are constructed at various stages of densi"cation: the size and shape of the yield surface depend upon the loading history and upon the relative density of the compact. The "nite element predictions suggest the formation of a vertex at the loading point for the entire densi"cation process in the case of isostatic compaction. On the other hand, a vertex at the loading point is formed only for a relative density D)0.85 in the case of closed-die compaction. 2000 Elsevier Science Ltd. All rights reserved.
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