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Three-dimensional dislocation dynamics simulation of the influence of sample size on the stress-strain behavior of fcc single-crystalline pillars

: Weygand, D.; Poignant, M.; Gumbsch, P.; Kraft, O.


Materials Science and Engineering, A. Structural materials, properties, microstructure and processing (2008), Nr.483-484, S.188-190
ISSN: 0921-5093
ISSN: 1873-4936
Fraunhofer IWM ()
size effect; dislocation dynamic; micro-pillar

The size-dependent flowstress in uniformly loaded pillars has been modeled using a discrete dislocation dynamics tool. Starting from Frank-Read sources of given length and random orientation, the simulated flow stress at 0.15% plastic strain shows a clear size effect, similar to experimental findings for larger strains. The scattering of the simulated stressstrain curves decreases with increasing sample size, which reflects that plasticity of small scale samples is very sensitive to the underlying dislocation microstructure.