Elastic Properties Of Nanocomposites Under Uniaxial Tensile Loading

Nanocomposites have become a hot research object in various fields because of its excellent mechanical properties.The selection of nanomaterials is very important to the overall properties of nanocomposites.Graphene,carbon nanotubes and other nanocomposites have become the preferred reinforcement phase materials for resin matrix composites because of their high strength,high stiffness and strong designability.Based on the finite element method,the elastic properties of graphene reinforced resin matrix composites,the new carbon mixtures based on graphene and carbon nanotubes(CNTs)—pillared graphene sheet(PGS),were studied in this paper.In this paper,based on the method of molecular structural mechanics,multi-scale finite element simulation and the finite element software ABAQUS,the finite element models of graphene,carbon nanotubes and PGS are constructed by using the modified beam element,and the finite element model of resin matrix is constructed by using solid element.The validity of the model is validated by comparing with the results of the existing literature.On this basis,the Young’s modulus,shear modulus,stress transfer in the interface layer of composites and the related mechanical properties of PGS of graphene reinforced resin-based nanocomposites were further analyzed.The main research contents of this paper include:Mechanical properties of graphene reinforced resin matrix composites.Representational volume elements(RVE)of the composites were constructed by ABAQUS.The Young’s modulus,shear modulus and stress transfer in the interface layer of the composites were simulated.The construction of representative volume units of composites focuses on the construction of interfacial layers.Tie bonding in ABAQUS is used to achieve the combination of graphene structure and matrix.The interfacial layer uses cutting method to endow it with different material attributes to realize the transition between the properties of resin matrix phase and graphene reinforced phase.Mechanical properties of graphene reinforced resin matrix composites containing defects were analyzed.The effects of defective graphene on the elastic properties of reinforced resin matrix composites with different number of vacancy defects and Stone-Wales(S-W)defects were further analyzed by constructing finite element models of graphene with different kinds and quantities of defects.Mechanical properties of novel 3D carbon structured cylindrical graphene PGS were analyzed.Based on ABAQUS beam element,the representative volume element of PGS is established.The effective and equivalent Young’s modulus and shear modulus of PGS were further analyzed according to the chirality of graphene and carbon nanotubes,the volume content of carbon nanotubes and the growth mode of carbon nanotubes.Compared with the basic structure graphene and carbon nanotubes,the PGS structure effectively improves the mechanical properties of graphene out of plane.