Anisotropic mechanical properties of graphene sheets from molecular dynamics

被引：245

作者：

Ni, Zhonghua ^{[1
]}

Bu, Hao ^{[1
]}

Zou, Min ^{[2
]}

Yi, Hong ^{[1
]}

Bi, Kedong ^{[1
]}

Chen, Yunfei ^{[1
]}

机构：

[1] Southeast Univ, Jiangsu Key Lab Design & Manufacture Micronano Bi, Key Lab MEMS, China Educ Minist, Nanjing 210096, Peoples R China

[2] Univ Arkansas, Dept Mech Engn, Fayetteville, AR 72701 USA

来源：

PHYSICA B-CONDENSED MATTER | 2010年 / 405卷 / 05期

关键词：

Anisotropic mechanical property; Graphene; Young's modulus; Fracture; Molecular dynamics; ELASTIC PROPERTIES;

D O I：

10.1016/j.physb.2009.11.071

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Anisotropic mechanical properties are observed for a sheet of graphene along different load directions. The anisotropic mechanical properties are attributed to the hexagonal structure of the unit cells of the graphene. Under the same tensile loads, the edge bonds bear larger load in the longitudinal mode (LM) than in the transverse mode (TM), which causes fracture sooner in LM than in TM. The Young's modulus and the third order elastic modulus for the LM are slightly larger than that for the TM. Simulation also demonstrates that, for both LM and TM, the loading and unloading stress-strain response curves overlap as long as the graphene is unloaded before the fracture point. This confirms that graphene sustains complete elastic and reversible deformation in the elongation process. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：1301 / 1306

页数：6

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