Study of Stone-wales Defect on Elastic Properties of Single-layer Graphene Sheets by an Atomistic based Finite Element Model

Authors

Department of Mechanical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran

Abstract

In this paper, an atomistic based finite element model is developed to investigate the influence of topological defects on mechanical properties of graphene. The general in-plane stiffness matrix of the hexagonal network structure of graphene is found. Effective elastic modulus of a carbon ring is determined from the equivalence of molecular potential energy related to stretch and angular deformation. A hexagonal carbon ring as a unit cell of graphene sheets is modeled by four-node elements and by applying three-node triangular elements, Stone-Wales (SW) defect as an important topological defect which leads to the formation of two heptagons and pentagons is modeled. In this method, both pristine structure of graphene and graphene with SW defect are considered and to get more real structure, an atomistic model of a small part of graphite sheet around the defect site, is modeled in Gaussian software and new arrangement around SW defect are obtained by minimizing its energy. Young’s modulus, shear modulus and Poisson’s ratio of the pristine single-layered graphene sheet (SLGS) and the effect of topological defects on the elastic properties of SLGS is examined. The numerical results from this new model show good agreement with data available in the literature.

Keywords

References

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International Journal of Engineering
Volume 31, Issue 3
TRANSACTIONS C: Aspects
March 2018
Pages 456-463

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