Dresden 2006 – wissenschaftliches Programm

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MM: Metall- und Materialphysik

MM 34: Symposium Materials Modelling III

MM 34.5: Vortrag

Donnerstag, 30. März 2006, 18:00–18:15, IFW A

Discrete Dislocation dynamics simulation: plasticity in µ meter sized pillars — •Daniel Weygand and Magali Poignat — IZBS, Kaiserstr. 12, University of Karlsruhe, 76133 Karlsruhe

The mechanical behaviour of monocrystalline µ-meter sized pillars is investigated using the three dimensional discrete dislocation dynamics methodology. The dependence of the plastic response of the pillars on the dislocation microstructure initially present and on the loading/boundary conditions is investigated. The analysis of the plasticity is performed in terms of the time evolution of individual dislocation densities on the different slip directions. These density evolutions are discussed in the context of the observed hardening. The study shows furthermore the influence of the grain orientation on the plastic flow. The simulation results are compared to the small strain regime of experimental stress strain curves obtained from compression experiments of such pillars.