Discrete dislocation modelling of submicron indentation
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Indentation of a planar single crystal by a circular rigid indenter is analyzed using discrete dislocation plasticity. The crystal has three slip systems and is initially dislocation-free, but edge dislocations can nucleate from point sources inside the crystal. The lattice resistance to dislocation motion, the interaction with point obstacles and dislocation annihilation are incorporated through a set of constitutive rules. Indentation is displacement driven and at each stage of the loading history, a boundary-value problem is solved for the evolution of the indentation pressure and the contact size. Preliminary results are presented for various values of the density of dislocation sources. 2005 Elsevier B.V. All rights reserved.