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Wrinkling formation in simply-supported graphenes under tension and compression loadings

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Abstract

Wrinkles in supported graphenes can be formed either by uniaxial compression or uniaxial tension beyond a certain critical load depending on the mode of loading. In the first case, the wrinkling direction is normal to the compression axis whereas in tension, wrinkles of the same pattern are formed parallel to the loading direction due to Poisson's (lateral) contraction. Herein we show by direct AFM observations that in simply-supported graphenes such instabilities appear as periodic wrinkles over existing stochastic undulations caused by the underlying-substrate-roughness. The critical strain for the generation of these wrinkles in both tension and compression is less than 1% which particularly for the former is far lower than the predicted tensile strain to fracture of suspended graphene estimated at ∼30%. Based on these findings, a constitutive model that provides the critical tensile strain for induced buckling in the lateral direction is proposed that depends only on the graphene-support interaction and not on the nature of the substrate. Understanding the wrinkling failure of graphenes under strain is of paramount importance as it leads to new threshold limits beyond which the physical–mechanical properties of graphene are impaired.

Graphical abstract: Wrinkling formation in simply-supported graphenes under tension and compression loadings

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Publication details

The article was received on 30 Aug 2017, accepted on 08 Nov 2017 and first published on 09 Nov 2017


Article type: Communication
DOI: 10.1039/C7NR06463B
Citation: Nanoscale, 2017, Advance Article
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    Wrinkling formation in simply-supported graphenes under tension and compression loadings

    Ch. Androulidakis, E. N. Koukaras, M. G. Pastore Carbone, M. Hadjinicolaou and C. Galiotis, Nanoscale, 2017, Advance Article , DOI: 10.1039/C7NR06463B

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