Mechanical properties study for graphene sheets of various size

We studied mechanical properties of large graphene sheets. The Young's modulus was found for each of the considered nanoparticles and sheets. To this end, the deformation was applied in two orthogonal directions – zigzag and armchair directions of the graphene atomic framework. It was established that there exist a size effect on the Young's modulus of graphene. Also, it was found that themechanical properties of graphene become close to isotropic ones when the linear dimensions of the latter are large enough for it to be considered as a macro-particle. Also, under these conditions, the Young's modulus becomes close to 1.1 TPa.