Residual strain in graphene: Study of temperature and crack effect

Document Type : Article

Authors

1 Faculty of Engineering, University of Shahreza, Isfahan, P.O. Box 86149-56841, Iran.

2 Faculty of Basic Sciences, University of Shahreza, Isfahan, P.O. Box 86149-56841, Iran.

Abstract

Graphene is a thin sheet with special properties and complicated mechanical behavior. It’s important to study graphene experimentally and theoretically. Stone–Wales defects, cracks and atom vacancy are popular defects in carbon allotropes especially in graphene. In this paper, residual strain in graphene was discussed. At first, stress-strain curve of non-defected graphene sheet was obtained using molecular dynamics simulation and effect of temperature on mechanical properties of graphene was obtained. Then, four different cracks were considered in center of graphene sheets. Stress-strain curves of defected graphene sheets with different tension strain rates were plotted. The results showed that cracks lead to the graphene to fracture sooner. Also, increasing temperature lead to the Young’s modulus of graphene decreases and graphene fractured at lower strain. On the other hand, residual strain of non-defected and cracked graphene increased by increasing temperature from 200 K to 1200 K. It means that graphene had more plasticity behavior by increasing temperature.

Keywords

Main Subjects

References

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Scientia Iranica
Volume 26, Issue 3
Transactions on Nanotechnology (F)
May and June 2019
Pages 1973-1979

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