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Indentation Crystal Plasticity: Experiments and Multiscale Simulations

Published online by Cambridge University Press:  31 January 2011

Hyung Jun Chang ,
Marc Fivel  and
Marc Verdier
Hyung Jun Chang
Affiliation:
[email protected], Univ. de Grenoble, SIMaP-CNRS, Grenoble, France
Marc Fivel
Affiliation:
[email protected], Univ. de Grenoble, SIMaP-CNRS, Grenoble, France
Marc Verdier
Affiliation:
[email protected], Univ. de Grenoble, SIMaP-CNRS, Grenoble, France
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Abstract

This work aims at a quantitative simulation of instrumented indentation test based on physics of crystal plasticity. Indentation loading is associated with a complex 3D deformation path: it can be viewed as an ideal benchmark to test various crystal plasticity assumptions. For large scale indentation (micron size), a 3D numerical simulation using finite element crystal plasticity (FEM) is setup and quantitatively compared to experimental results using critical constraints: the load/stiffness-displacement curves and the surface displacements. Various set of parameters obtained from Dislocation Dynamics (DD) are used. A comparison with experiments shows the dominant effect of initial dislocation density and slip system interactions. For smaller depth (maximum 100 nm), Dislocation Dynamics coupled simulations to FEM are setup. Since this approach does not provide defect nucleation rules, several strategies are implemented and tested: fitting to Molecular Dynamics (MD) load-depth curve for spherical tip, or automatic generation of deformation accommodating dislocation (GND) for conical tip geometry for example. In this framework, size effects show up in the modification of the dislocation structures with depth through critical expansion of dislocation loops and junction formation.

Keywords

dislocationsnano-indentationsimulation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1224: Symposia FF/GG – Mechanical Behavior at Small Scales — Experiments and Modeling , 2009 , 1224-GG02-05
Copyright
Copyright © Materials Research Society 2010

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