Mechanical Properties of the Carbon Graphene Sheets with FEM

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Moshrefzde Sani, Hadi | 2011

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 41609 (45)
University: Sharif University of Technology
Department: Aerospace Engineering
Advisor(s): Hosseini Kordkheili, Ali
Abstract:
In this research, molecular structural mechanics method is employed to calculate the Young’s modules of a two-layered carbon graphene sheet. For this purpose, covalent bonds are modeled using non-linear beam elements and van der Waals interactions are replaced by nonlinear truss elements. Morse potential and Lennard-Jones potential equations are used to simulate the covalent bonds and van der Waals interactions, respectively. For each atom, van der Waals forces are considered from all other atoms located in its cut-off radius. Young’s modulus, bending modules and Poisson’s ratio of single and two-layered graphene sheets were calculated and the results revealed that Young’s modulus decreases linearly with strain; but Poisson’s ratio is independent of strain
Keywords:
Finite Element Method ; Nanostructure ; Molecular Mechanics ; Graphene Sheet

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