▎ 摘　　要

Elastic properties of monolayer and multilayer graphene nanofilms are investigated in the paper based on structural mechanics approach. Via the linkage between the interatomic potential energy in molecular mechanics and the strain energy in classical structural mechanics, the models of space frame structures are developed to simulate the graphene crystals. By using finite element method, Young's moduli and Poisson's ratios of monolayer graphene nanofilms are calculated, and are proved to be size- and chirality-dependent. The values of Young's moduli and Poisson's ratios show an agreement with the experimental results in the literatures. In addition, Young's moduli and Poisson's ratios of multilayer graphene nanofilms are simulated to the cases with and without surface relaxation taken into consideration, respectively. The results of calculation show that Young's modulus of multilayer graphene nanofilms is size-dependent, and surface relaxation has important influence on it.