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Discrete dislocation simulations of the plasticity of micro-pillars under uniaxial loading

: Senger, J.; Weygand, D.; Gumbsch, P.; Kraft, O.


Scripta materialia 58 (2008), No.7, pp.587-590
ISSN: 1359-6462
Journal Article
Fraunhofer IWM ()
dislocation dynamic; simulation; tension test; size effect

Recent experiments have shown an unexpected strong size effect in uniaxial compression tests of metallic micro-pillars, such as the flow stress increases with decreasing pillar diameter. In our work, we apply three-dimensional discrete dislocation dynamics (DDD) to simulate these experiments on a mesoscopic level. Although we simulate systems with a constant source size and density, the simulations show a size effect related to size-dependent differences in details of the dislocation behavior in excellent agreement with the experiments.