Research Of Single Layer Graphene’s Tensile Properties After Irradiation Damage

Graphene with high strength, stiffness, and specific electrical properties, areconsidered as new strategic materials, and it will have a very broad applicationprospects. However, in order to achieve the project applications, it requires a furtherprocessing to prepared graphenes. Graphenes can be modified and cut during theparticle irradiation, and as a result, it can change the physical and chemical properties ofgraphite as needed. During the rradiation progress, there will be many damaged defectsgenerate randomly, which can make influences on the mechanical properties ofgraphenes. Therefore, study the mechanical properties of graphene after irradiation hasgreat significance just because it is the premise and basis for graphene engineeringapplications and performance exploitations.In this paper, single-layer graphene is selected as the research object. Based on themolecular dynamics theory, the mechanical properties of impaired graphene after siliconirradiated were studied. The paper is divided into the following three parts.A model that silicon particles irradiate graphene was established using the moleculardynamics method, and achieved the particle irradiation process; at the same time,relationships between the number of defects of graphene and the incidence angle,energy and dose of the silicon particles were studied; After statistical analysis of thedefect, the number of defects had a positive correlation with the dose, while increasedwith the increasing energy and incident angle within a certain range; besides, the studyfound that the particle absorption often occurred at the defect locations.The tensile failure deformation mechanisms of graphene with the irradiation damages during the process of tensile fracture were analyzed in this article. The results showedthat the fracture of graphene with radiation damages started from the incompleted bondpositions, and extended to large defect density directions, not like perfect graphenewhich cracked from the edge and extends along the45°direction. Select graphene afterirradiation damaged to have a tensile simulation, and study the functions on the tensilemechanical properties of graphene under different conditions, temperatures and strainrates. The results showed that there was a direct relationship between tensile propertiesand the number of defects; in addition, the number of defects had connections with thedose, energy and angle of incidence; thereby, it could indirectly reflect the changes ofultimate tensile strength and tensile strain under the three kinds of working conditions.The tensile mechanical properties of radiation damaged graphene had a strongdependence to the temperature, while been insensitive to strain rates.