Mechanical properties of crumpled graphene under hydrostatic and uniaxial compression

JA Baimova and B Liu and SV Dmitriev and K Zhou, JOURNAL OF PHYSICS D-APPLIED PHYSICS, 48, 095302 (2015).

DOI: 10.1088/0022-3727/48/9/095302

A molecular dynamics study is undertaken to estimate the mechanical responses of crumpled graphene subjected to hydrostatic compression and uniaxial compression, respectively. The crumpled graphene is found to be a non-Hookean medium showing a non-linear stress-strain relation even for small strain and this is explained by structural changes that start to occur when a small stress is applied. Analysis of the unloading curves suggests that the elasticity limit is achieved at smaller densities under hydrostatic compression rather than under uniaxial compression. Corners of double-folded graphene flakes are formed under hydrostatic compression, while uniaxial compression results mainly in formation of single folds with less damage of the graphene lattice.

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