Design And Mechanical Performance Research Of Anti-Collision Beam And Energy Absorbing Box Based On Superstructure

The section design of Anti-collision beam and the structure design of Energy absorbing box are important factors affecting the deformation and energy absorption of automobile collision.In order to enhance the ability of the Anti-collision beam to resist deformation and the energy absorption effect of the Energy absorbing box,this thesis designs a concave-convex adjustable Poisson’s ratio structure,and analyzes the mechanical properties of the new structure.The structure is applied to the structural design of the Anti-collision beam section and the Energy absorbing box.The stiffness optimization of the internal skeleton of the automobile Anti-collision beam and the structural design of the coupling Energy absorbing box are carried out,which improves the Anti-collision ability of the automobile.The main contents are as follows :A concave-convex adjustable Poisson’s ratio structure model is constructed.Under uniaxial tensile stress.The theoretical analytical formula of equivalent Poisson’s ratio of adjustable Poisson ’s ratio structure is derived based on energy method.Through the finite element simulation of the tensile behavior of the structure.The correctness of the theoretical analytical formula is verified,and the accuracy of the theoretical results and the simulation results is further verified by experiments.The relationship between structural geometric parameters and equivalent Poisson’s ratio is discussed by theoretical analysis.It is found that the structure is only affected by the angle parameters,which reveals the inherent characteristics of the structure.Based on the finite element simulation analysis,a new Anti-collision beam structure model is established based on the cross-section structure of the Anti-collision beam after topology optimization.The mechanical properties of rectangular cross-section Anti-collision beam,zero Poisson’s ratio structural cross-section Anti-collision beam,ordinary optimized Anti-collision beam and topology optimized Anti-collision beam under the same boundary conditions are compared.It is found that the deformation of the topology optimization Anti-collision beam in the three main axis directions is the smallest,indicating that the new Anti-collision beam section structure under topology optimization has the strongest ability to resist deformation.A new Anti-collision beam structure model is established based on the cross-section structure of the Anti-collision beam after topology optimization.Based on the finite element simulation analysis,the forces of rectangular section Anti-collision beam,zero Poisson’s ratio structural section Anti-collision beam,ordinary optimized Anti-collision beam and topology optimized Anti-collision beam under the same boundary conditions are compared.