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Computational Nanomechanics of Graphene Membranes

Published online by Cambridge University Press:  31 January 2011

Romain Perriot ,
Xiang Gu  and
Ivan I. Oleynik
Romain Perriot
Affiliation:
[email protected], University of South Florida, Physics, Tampa, Florida, United States
Xiang Gu
Affiliation:
[email protected], University of South Florida, Physics, Tampa, Florida, United States
Ivan I. Oleynik
Affiliation:
[email protected], University of South Florida, Physics, Tampa, Florida, United States
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Abstract

Molecular Dynamics (MD) simulations of nanoindentation on graphene membranes were performed. The 2-d Young's modulus of the graphene monolayer was determined as 243 ± 18 N/m and the breaking strength as 41 ± 3 N/m. These values agree reasonably well with recent experimental results [1]. In addition, the simulations allowed us to examine the atomic-scale dynamics of membrane breaking during the nanoindentation, involving formation of an increasing number of lattice defects until membrane is completely broken. The onset of defect appearance allowed us to determine the true elastic limit of graphene and the corresponding yield strength 29 ± 1 N/m which was not accessible experimentally. The defects consist of vacancies and Stone-Wales type defects. Long stable linear chains of sp bonded carbon atoms (carbynes) were observed under the indenter at the advanced stages of indentation. The dynamics of fracture propagation is governed by the shear stresses developed in the sample.

Keywords

Cnano-indentationelastic properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1185: Symposium II – Probing Mechanics at Nanoscale Dimensions , 2009 , 1185-II05-04
Copyright
Copyright © Materials Research Society 2009

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