Design And Pressure Analysis Of Closed-cell Icosahedron Garphene Microstructures

The excellent mechanical properties of graphene make it an ideal structural material.This paper proposes a closed-cell icosahedron microstructure consisting of graphene,which is lighter than air by filling helium or hydrogen in a single-layer graphene structure.The formation and organiza tion of closed-cell icosahedral graphene microstructures were discussed.The feasibility and implementation conditions of the closed-cell icosahedral graphene microstructures lighter than air were analyzed.The relationship between the pressure,density,s ize,and stability of graphene microstructures were evaluated.The closed-cell icosahedron graphene microstructure which lighter than air was designed and its pressure capacity was calculated.The spherical-like polyhedron structure with large volume area is selected and the principle of geometric relations is given priority.The design of closed-cell icosahedron graphene microstructure is completed by using graphene combination and splicing.The relationship between the microstructure size and the density of the microstructure has been obtained to satisfy the lighter-than-air condition with the smallest geometry and the best configuration.Gra Creator was used to establish a closed-cell icosahedron graphene microstructure molecular dynamics model and LAMMPS was used to calculate the two extreme pressure conditions,ie,the closed-cell icosahedral graphene under pure external pressure and pure internal pressure.The suitable pressure conditions for closed-cell icosahedral graphene microstructures are obtained,and the feasibility and stability of closed-cell icosahedron graphene microstructures in density less than air are analyzed.In order to improve the efficiency of closed-cell icosahedral graphene microstructure related molecular dynamics calculations,a coarse-grained molecular dynamics simulation analysis model was established.The rules of influence of different parameters on the mechanical properties of coarse-grained graphene sheets in the coarse-grained potential function are summarized,and the consistency of mechanical properties is used as a criterion.The coarse-grained molecular dynamics simulation parameters were established to improve the computational efficiency of closed-cell icosahedral graphene microstructures,providing a feasible route for the calculation of larger-scale closed-cell icosahedral graphene microstructures.The effects of defects in graphene on the mechanical properties of closed-cell icosahedral graphene microstructures were considered.The effect of defects in graphene on the mechanical properties of the graphene sheets was investigated by the use of graphene sheets containing defects.On the basis of graphene sheets,the closed-cell icosahedral graphene microstructures with defects are analyzed.The influence of different defects on the microstructure of closed-cell icosahedral graphene is discussed,and it is proved that the common graphene defects are not enough to destroy the stability of the structure,which provides a reference for the practical preparation and application of the closed-cell icosahedron graphene microstructure.The proposed structure expands the research scope and implementation approach of the current ultra-light materials,and explores a new approach for research of lighter than air materials.