| Nanomaterials and nanostructures are the hot areas of today’s new material, and they arealso the core component. Among which, the research of carbon nano-materials is especiallymore prominent, such as carbon nanotubes, graphene and fullerene C60are typical. Theobject of this paper is graphene sheets, it has a distinctive mechanical properties, opticalproperties and electrical properties, it has the strong stiffness and toughness while it also has agood adsorption properties, it belongs to the semiconductor materials but with thesuperconductivity. All of the properties make the graphene sheets have broad applicationprospects.Molecular Dynamics method is widely used in the study of nanostructures, it can solvethe trajectory of atoms by the interaction potential and then to analyze the deformationmechanism of the nanostructures.In this paper’s study, the two-way stretch on different size of mono-layered graphenesheets were simulated with the Molecular Dynamics first, the tensile stress-strain relationshipand tensile failure modes were got, and the elastic modulus was calculated. The results showthat the tensile properties of mono-layered graphene sheets are almost not change with thechange of graphene sheets’ size. Secondly, in the case of the same size, the effect of layers,temperature, tensile strain rate and atomic defects on the tensile properties of graphene sheetswere studied, the results show that the tensile properties of graphene sheets are less dependenton the change of layers, but have a grate dependence on the temperature, the tensile strain rateand the atomic defect. Finally, take the small scale effect of nanomaterials into account, thesmall scale parameter’s scale-dependence of the graphene sheets’ deformation wassystematically studied using nonlocal elastic theory combined with the Molecular Dynamicssimulation, the relationship between the small scale parameter of the graphene sheets’deformation and the size, the chiral was also revelealed. |
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