Abstract
This paper studies the effect of biaxial compression on the mechanical properties of three-dimensional structure consist of six graphene flakes with interlayer distance two times bigger than this of graphite. The folding and crumpling of graphene sheets under loading and unloading is studied. It is found that considered material cannot be elastically deformed even for low strain values. It is shown that wide ripples which appear at the first deformation stages transform to the sharp folds due to the van der Waals interaction between graphene sheets. The ridges and corners of folds have the highest potential energy and atoms with two nearest neighbors are concentrated in the edges of folds. Presented results can be applied to the investigations of crumpled grapheme properties, which is of high importance for energy storage, electronics and composites.
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