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Temperature and strain-rate dependent fracture strength of graphene H. Zhao and N. R. Alurua

Summary: Temperature and strain-rate dependent fracture strength of graphene
H. Zhao and N. R. Alurua
Department of Mechanical Science and Engineering, Beckman Institute for Advanced Science
and Technology, University of Illinois at Urbana­Champaign, Urbana, Illinois 61801, USA
Received 29 June 2010; accepted 7 August 2010; published online 22 September 2010
We investigate the variation in fracture strength of graphene with temperature, strain rate, and crack
length using molecular dynamics MD simulations, kinetic analysis of fracture with a nonlinear
elastic relation, and the quantized fracture mechanics theory. Young's modulus does not vary
significantly with temperature until about 1200 K, beyond which the material becomes softer.
Temperature plays a more important role in determining the fracture strength of graphene. Our
studies suggest that graphene can be a strong material even, when subjected to variations in
temperature, strain rate, and cracks. © 2010 American Institute of Physics. doi:10.1063/1.3488620
The observation of novel properties at nanoscale, includ-
ing material properties, has intensified the design and devel-
opment of nanoelectromechanical-systems NEMS for vari-
ous applications. A significant number of studies have been
performed on one-dimensional nanostructures, such as nano-
wires and nanotubes, to understand their mechanical, electri-
cal, thermal, and optical properties at nanoscale. The me-


Source: Aluru, Narayana R. - Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign


Collections: Engineering; Materials Science