▎ 摘　　要

In this article, the tensile strength, fracture strain and elastic modulus of graphene sheet (GS) containing randomly distributed vacancies are investigated using molecular dynamics simulations, and the effects of temperature and vacancy defect on these mechanical properties are analyzed. The presences of defects dramatically degrade the mechanical performance of GSs. When the number of defects is large enough the failure mechanism of the GS will change. The defects deteriorate the mechanical properties of the GSs by reducing their tensile strength, failure strain and elastic modulus. However, the discrepancies between 0.01K and the finite temperature (300 K, 600K and 900K) remain almost the same as the percentage of vacancy increases.