Ar. Akisanya et Acf. Cocks, STAGE-I COMPACTION OF CYLINDRICAL PARTICLES UNDER NONHYDROSTATIC LOADING, Journal of the mechanics and physics of solids, 43(4), 1995, pp. 605-636
Constitutive models are developed for stage I compaction of a two-dime
nsional array of cylindrical particles under general loading. Densific
ation is assumed to occur by plastic deformation at particle contacts,
and yield surfaces are constructed as functions of two state variable
s using slip-line field and finite element methods. The shape and size
of the yield surface are found to depend upon the loading history and
the relative density of the array. The effects of non-hydrostatic loa
ding and material hardening upon the pressure-density response of the
array of particles are examined by the finite element method. The nume
rical predictions of the pressure-density response are compared with e
xperimental results for hydrostatic and closed-die compaction of plast
icene cylinders.