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

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

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Scripta materialia 58 (2008), Nr.7, S.587-590
ISSN: 1359-6462
Englisch
Zeitschriftenaufsatz
Fraunhofer IWM ()
dislocation dynamic; simulation; tension test; size effect

Abstract
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.

: http://publica.fraunhofer.de/dokumente/N-70993.html