Abstract
Molecular dynamics calculations were performed using embedded atom
method (EAM) potentials to study the localization of inelastic flow
and crack initiation in fcc single crystal copper and nickel. We
compared the atomic scale anisotropic inelastic response of the copper
single crystals from EAM to the results of Philos. Mag. 78(5) (1998)
1151 (experiments and finite element results using single crystal
plasticity). Hollow circular cylinders of single crystals were loaded
radially with a constant average velocity at a strain rate of 109s-1,
inducing the collapse of the cylinder. Various initial orientations
of the lattice are examined to study the localization of flow and
crack initiation. Comparisons between EAM, experiments, and finite
element simulations were in good agreement with each other illustrating
that kinematic and localization effects are invariant to extremely
large spatial and temporal regimes. Finally, similar dislocation
nucleation patterns, localization sites, and crack initiation sites
were observed when comparing copper to nickel.
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