Multiscale Modeling Analysis Of Elastic Properties Of Nanocomposites

Nanocomposite materials usually refer to the use of macromolecular polymers,rubber and other substrates as the continuous phase,and the use of graphene,carbon nanotubes and other nanomaterials as the dispersed phase,nanomaterials are added to the matrix by a certain method to form a new material system with nanometer size.Nanomaterials have been used in military,aerospace,precision machinery and other industries due to their good mechanical properties.In this paper,based on the finite element method,a variety of nanocomposites were established,and the changes of the elastic properties of the nanocomposites under different conditions were studied.In this paper,the method of molecular dynamics and the simulation analysis software ABAQUS were used to construct finite element models of graphene,carbon nanotubes and columnar graphene,then they were dispersed into the established matrix to form graphene reinforced composites,carbon nanotube reinforced composites,nanocomposites reinforced by graphene and carbon nanotubes,and PGS reinforced composites.Compared with the existing experimental results,the effectiveness of graphene nanocomposites and carbon nanotube nanocomposites were verified,then carbon nanotubes reinforced composites,nanocomposites reinforced by graphene and carbon nanotubes and PGS reinforced composites were studied,and their Young’s modulus and shear modulus were analyzed.The main research contents of this paper include the following points:Analysis of elastic properties of carbon nanotube reinforced resin matrix composites.The equivalent volume unit of nanocomposites was constructed by ABAQUS software,and the Young’s modulus and shear modulus of carbon nanotubes reinforced composites under the condition of different inclination angles and different volume fractions of carbon nanotubes in the matrix were studied.Using the Tie connection in the Interaction module of ABAQUS,the fusion of the carbon nanotubes and the substrate was completed.The interface layer was formed by cutting the matrix,and the transition of the material properties of the resin-based continuous phase and the carbon nanotube reinforced phase was realized by giving 17 interface layers different material properties.Analysis of elastic properties of resin matrix composites reinforced by graphene(G)and carbon nanotubes(CNTs).By constructing a finite element model of the graphene and carbon nanotubes composites containing different angles and amounts,the effects of the angle and volume fraction of the nano-reinforced phase on the elastic properties of the resin matrix composites reinforced by graphene and carbon nanotubes were further analyzed.Analysis of elastic properties of columnar graphene(PGS)reinforced resin matrix composites.Based on the beam element whose material parameters were set in ABAQUS,the equivalent volume element of PGS was established.By changing the column spacing PD,column length PL,the volume fraction of PGS and the number of carbon nanotubes contained in each layer of PGS,the changes of Young’s modulus and shear modulus of PGS reinforced composites were simulated and analyzed respectively.At the same volume fraction,the comparison with the simulation results of carbon nanotubes reinforced composites and composites reinforced by graphene and carbon nanotubes showed that the PGS reinforced composite structure has better mechanical properties.