Failure Processes in Embedded Monolayer Graphene under Axial Compression

Androulidakis, Charalampos and Koukaras, Emmanuel N. and Frank, Otakar and Tsoukleri, Georgia and Sfyris, Dimitris and Parthenios, John and Pugno, Nicola M. and Papagelis, Konstantinos and Novoselov, Kostya S. and Galiotis, Costas (2014) Failure Processes in Embedded Monolayer Graphene under Axial Compression. In «Scientific Reports», vol. 4, London, UK : Nature Publishing Group, p. 5271.

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      Exfoliated monolayer graphene flakes were embedded in a polymer matrix and loaded under axial compression. By monitoring the shifts of the 2D Raman phonons of rectangular flakes of various sizes under load, the critical strain to failure was determined. Prior to loading care was taken for the examined area of the flake to be free of residual stresses. The critical strain values for first failure were found to be independent of flake size at a mean value of –0.60% corresponding to a yield stress up to -6 GPa. By combining Euler mechanics with a Winkler approach, we show that unlike buckling in air, the presence of the polymer constraint results in graphene buckling at a fixed value of strain with an estimated wrinkle wavelength of the order of 1–2 nm. These results were compared with DFT computations performed on analogue coronene/PMMA oligomers and a reasonable agreement was obtained.

      Item Type: Article in journal
      FP7 Grant Agreement Number: European Research Council/StG Ideas 2011 - BIHSNAM/EU/FP7/279985, European Research Council/PoC 2013-I - REPLICA2/EU/FP7/619448, European Research Council/PoC 2013-I - KNOTOUGH/EU/FP7/632277, Graphene Flagship/EC/FP7/604391
      Department or Research center: Civil, Environmental and Mechanical Engineering
      Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA630 Structural Engineering
      Repository staff approval on: 15 Jan 2015 10:18

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