Research On Application Of Carbon Nanotube-Reinforced Composite Plates In Axially Moving Structures

Carbon Nanotubes are often used as the reinforcing phase of composite materials due to their excellent physical and mechanical properties to form Carbon Nanotube – Rein-forced Composite materials(CNTRC).In order to meet the high-strength and light-weight requirements of the axial motion plate structure in the transportation,aerospace,mechanical and other engineering fields,and to improve the work efficiency and service life of the structure,promote the application of carbon nanotube-reinforced composite materials in the transportation and other engineering fields.In the present study,the mechanical properties of axially moving carbon nanotube-reinforced composite plates are investigated.First,considering the scale effect of carbon nanotubes,introducing the efficiency parameters of carbon nanotubes,and establish a physical parameter model of composite materials with Single-Walled Carbon Nanotubes(SWCNT)as the reinforcing phase and polymethyl methacrylate(PMMA)as the matrix according to the mixing law.Based on the composite plate theory and the Hamiltonian principle,the equations of motion of the composite plate are derived.The effects of different in-plane forces,axial velocities,distribution and volume fraction of carbon nanotubes,boundary conditions and other factors on the free vibration frequency and dynamic response of the composite plate are investigated by the harmonic equilibrium method and Galerkin,and analyzed.The results show that the free vibration frequency and dynamic response of the composite plate are increased with the increase of aspect ratio and in-plane tension,and decreased with the increase of axial velocity and in-plane pressure.In addition,the boundary conditions have an effect on the self-vibration frequency and plate center deflection values of the axially moving carbon nanotube-reinforced composite plate.Then,the analytical solutions to the buckling and dynamic stability boundaries of an axially moving carbon nanotube reinforced composite plate under in-plane periodic loading are solved by the Galerkin and Bolotin method.The results show that the critical buckling,critical load and critical excitation frequency of the axially moving carbon nanotube reinforced composite plate decrease with increasing axial velocity;The critical load and critical excitation frequency of composite plates increase with the increase of in-plane tension,the unstable area decreases with the increase of in-plane tension,and the influence of in-plane pressure is opposite.Among the four distribution patterns of FG-O,FG-V,FG-X and UD,the FG-X distribution has the strongest strengthening effect on the axially moving carbon nanotube-reinforced composite plates,followed by the UD distribution and the smallest FG-O distribution.Finally,taking the axial motion plate in the field of traffic engineering as examples,the influencing factors of the dynamic characteristics of ordinary steel plate,functionally graded material plate and carbon nanotube reinforced composite material plate are compared so as to provide guidance for the practical application of axial motion plateThe corresponding programs for the theory and method of this paper have been made by using Matlab,and many numerical results have been presented.These results have a certain reference and reference for the research on the vibration,buckling and dynamic stability of the carbon nanotube plate structure.