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Kim, Sung Youb
Computational Advanced Nanomechanics (CAN) Lab
Research Interests
  • Computational Mechanics

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Atomistic simulations of incipient plasticity under A1(111) nanoindentation

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Title
Atomistic simulations of incipient plasticity under A1(111) nanoindentation
Author
Lee, YoungminPark, Jong YounKim, Sung YoubJun, SukkyIm, Seyoung
Keywords
Dislocation-loop glide; Homogeneous dislocation nucleation; Incipient plasticity; Molecular dynamics; Molecular mechanics; Nanoindentation
Issue Date
200510
Publisher
ELSEVIER SCIENCE BV
Citation
MECHANICS OF MATERIALS, v.37, no.10, pp.1035 - 1048
Abstract
Atomistic simulations are performed for the study of defect nucleation and evolution in Al single crystal under nanoindentation. Methodologies employed include the molecular dynamics and molecular mechanics simulations with embedded-atom potentials. Simulated is the indenting process on Al(1 1 1) surface with the spherical tip of indenter. Using the visualization technique of centrosymmetry parameters, homogeneous nucleations and early evolutions of dislocations are investigated for deepening our understanding of incipient plasticity at the atomic scale. We have shown that the nucleation sites of initial dislocation loops vary with the empirical potentials chosen for the simulation. Identifications are also made for the continuously changing structures of dislocation locks underneath the indenter tip and for the glide of prismatic partial dislocation loops far away from the contact surface.
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DOI
http://dx.doi.org/10.1016/j.mechmat.2005.01.004
ISSN
0167-6636
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