Research Papers

Toughening Graphene With Topological Defects: A Perspective

[+] Author and Article Information
Teng Zhang

School of Engineering,
Brown University,
Providence, RI 02912

Huajian Gao

School of Engineering,
Brown University,
Providence, RI 02912
e-mail: Huajian_Gao@brown.edu

The Latin word ruga is used to refer a large-amplitude state of wrinkles, creases, ridges, or folds [9].

Manuscript received March 13, 2015; final manuscript received March 13, 2015; published online March 30, 2015. Editor: Yonggang Huang.

J. Appl. Mech 82(5), 051001 (May 01, 2015) (3 pages) Paper No: JAM-15-1138; doi: 10.1115/1.4030052 History: Received March 13, 2015; Revised March 13, 2015; Online March 30, 2015

The low fracture toughness of graphene has raised sharp questions about its strength in the presence of crack-like flaws. Here, we discuss a number of recent studies that suggest some promising routes as well as open questions on the possibility of toughening graphene with controlled distributions of topological defects.

Copyright © 2015 by ASME
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Grahic Jump Location
Fig. 1

Toughening mechanisms induced by topological defects in graphene. (a) Dislocation shielding; (b) stress reduction by out-of-plane deformation; and (c) atomic-scale crack bridging. The color represents normal stress σyy in (a) and (c) and out-of-plane deformation in (b). Figure adapted from Ref. [8].

Grahic Jump Location
Fig. 2

A general methodology to design an arbitrary 3D curved graphene structure through controlled distributions of topological defects. (a) The target curved surface. (b) A continuum triangular pattern of density waves on the target curved surface generated by a phase field crystal method. (c) A discrete triangular lattice network from the continuum density waves. (d) The full-atom structure generated from a Voronoi construction from the triangular network, followed by equilibration through MD simulations. Figure adapted from Ref. [8].




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