Contributions to experimental mechanics of graphene
(2017)
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- Abstract
- Graphene is a novel 2D material with exceptional physical properties. It is the world’s strongest material with a Young’s modulus of 1 TPa and a strength of up to 130 GPa, which has led to potential applications of graphene in composites as a strengthening component. In addition, the surface properties of graphene have promoted its use in coating applications. Moreover, it is predicted that under uniaxial loads, graphene would exhibit novel properties. However, very few techniques to uniaxially load graphene have been reported, owing to the complications of its handling and processing. In order to study the mechanical properties of graphene, two systems have been characterized. First, a Cu film with graphene coating has been tested by nanoindentation and the effect of graphene on the elastic and plastic contact response of Cu is studied. Graphene is found to increase the elastic load bearing capacity of Cu and to eliminate the surface adhesion with the contacting tip. It is also found to inhibit dislocations movement at the interface during plastic deformation. Second, a process has been developed and optimized to fabricate on-chip micro tensile testing devices based on the technique established at UCL to generate uniaxial strains in suspended graphene beams. Proof-of-concept results are presented.
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Citations
Hammad, M. (2017). Contributions to experimental mechanics of graphene. https://hdl.handle.net/2078.5/177836