Superelasticity and wrinkles controlled by twisting circular graphene

Superelasticity and wrinkles controlled by twisting circular graphene Controllable wrinkles in terms of amplitude, wavenumber and onset torsional angle are realized by using a twisting way of circular graphene sheets. A parametric study is carried out to investigate several factors, i.e., graphene size (inner radius r I and outer radius R o ) and torsional angle, on the wrinkle formation of graphene. The effects of both wavenumber and amplitude are investigated in detail, because they are the most critical parameters in tuning the surface morphology that is finally reflected on the electrical properties of graphene. It is found that the onset torsional angle on the formation of wrinkles decreases as the graphene size increases. When the torsional angle increases continuously, the amplitude will abruptly jump due to a sudden change in the wrinkle pattern. The wrinkle wavenumber of graphene can also be controlled by changing the ratio of the inner and outer radii (i.e., r I ∕ R o ). The variation of the strain energy shows that the structural transformation is reversible, this is mainly caused by the superelastic property of graphene. Hence, the formation of recyclable wrinkles can be realized by loading and unloading processes. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Computer Methods in Applied Mechanics and Engineering Elsevier

Superelasticity and wrinkles controlled by twisting circular graphene

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Publisher
Elsevier
Copyright
Copyright © 2018 Elsevier B.V.
ISSN
0045-7825
eISSN
1879-2138
D.O.I.
10.1016/j.cma.2018.04.049
Publisher site
See Article on Publisher Site

Abstract

Controllable wrinkles in terms of amplitude, wavenumber and onset torsional angle are realized by using a twisting way of circular graphene sheets. A parametric study is carried out to investigate several factors, i.e., graphene size (inner radius r I and outer radius R o ) and torsional angle, on the wrinkle formation of graphene. The effects of both wavenumber and amplitude are investigated in detail, because they are the most critical parameters in tuning the surface morphology that is finally reflected on the electrical properties of graphene. It is found that the onset torsional angle on the formation of wrinkles decreases as the graphene size increases. When the torsional angle increases continuously, the amplitude will abruptly jump due to a sudden change in the wrinkle pattern. The wrinkle wavenumber of graphene can also be controlled by changing the ratio of the inner and outer radii (i.e., r I ∕ R o ). The variation of the strain energy shows that the structural transformation is reversible, this is mainly caused by the superelastic property of graphene. Hence, the formation of recyclable wrinkles can be realized by loading and unloading processes.

Journal

Computer Methods in Applied Mechanics and EngineeringElsevier

Published: Aug 15, 2018

References

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