Temperature effect on graphene strength

A.M. Iskandarov1, Y. Umeno2, S.V. Dmitriev1
1Institute for Metals Superplasticity Problems RAS, Khalturin St. 39, 450001 Ufa
2Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, Japan 153-8505
Abstract
 The effect of temperature on the strength of strained graphene is studied by means of molecular dynamics simulations. Initially strained graphene is heated with constant temperature increase rate from 0 K up to the mechanical instability and fracture. Strong influence of the temperature increase rate on the critical temperature has been revealed, which is an expected effect in the simulations of fracture triggered by thermal fluctuations. For uniaxial tension along zigzag (armchair) direction the critical strain at room temperature is equal to 0,22 (0,19), while at zero temperature the critical strain is equal to 0,30 (0,23). Hydrostatic tension at zero temperature results in graphene fracture at strain of 0.23, while at room temperature at strain of 0.16.
Accepted: 26 October 2011
Views: 59   Downloads: 10
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