High-Performance Computing in Materials Science (HPC)
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Multiscale modelling of nanoindentation: from atomistic to continuum models
P. S. Engels, C. Begau, S. Gupta, B. Schmaling, A. Ma, A. Hartmaier.
A. Tiwari,Nanomechanical analysis of high performance materials, Springer Science + Business Media, Dordrecht, 203, 285-322, (2014)
Abstract
Nanoindentation revealed a number of effects, like pop-in behavior
or indentation size effects, that are very different from the classical mechanical
behavior of bulk materials and that have therefore sparked a lot of research activities. In this contribution a multiscale approach is followed to understand the mechanisms behind this peculiar material behavior during nanoindentation. Atomistic
simulations reveal the mechanisms of dislocation nucleation and multiplication
during the very start of plastic deformation. From mesoscale dislocation density
based models we gain advanced insight into how plastic zones develop and spread
through materials with heterogeneous dislocation microstructures. Crystal plasticity models on the macroscale, finally, are able to reproduce load-indentation
curves and remaining imprint topologies in a way that is directly comparable to
experimental results and, thus, allows for the determination of true material properties by inverse methods. The complex interplay of the deformation mechanisms
occurring on different length scales is described and the necessity to introduce the
knowledge about fundamental deformation mechanisms into models on higher
length scales is highlighted.
Keyword(s): nanoindentation; dislocations; molecular-dynamics; crystal-plasticity
DOI: 10.1007/978-94-007-6919-9_15
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