Study On Energy Absorption Characteristics Of Negative Poisson’s Ratio Internal Concave Honeycomb Structure Based On Multi-scale Analysis

Honeycomb structure has been widely used in industry because of its light weight and deformable characteristics.With the increasing market demand for honeycomb sandwich plate,requirements for in-depth study of honeycomb sandwich panel have been intensified.The study of the honeycomb sandwich plate has been constantly expanding in various subject areas.The functions of various properties of the honeycomb sandwich have been enhanced in many subject areas such as magnetic,heat,electricity and sound.The honeycomb structure as a new type of structure has been widely used in the current production line.In order to obtain the honeycomb structure with better performance,scholars focus on changing the Poisson’s ratio of the honeycomb structure.By changing the single cell structure of the honeycomb structure,the Poisson’s ratio of the honeycomb macro structure becomes negative.The negative Poisson’s ratio greatly improves the mechanical properties of the honeycomb structure in various working environments.The negative Poisson’s ratio concave honeycomb structure studied in this paper has the advantages of light weight,cost saving,high plasticity,high stiffness The characteristics of good strength have been widely studied in recent two years.This paper introduces the development and research status of honeycomb structure and negative Poisson’s ratio honeycomb structure,deduces the theoretical value of the mechanical properties of honeycomb structure,compares the theoretical value with the finite element simulation value and the experimental value,and studies the influence of each structural parameter of single cell on the structure,so as to extend the influence on the macro negative Poisson’s ratio concave honeycomb structure.In the research of the overall structure of negative Poisson’s ratio concave honeycomb,the concept of gradient is extended to the honeycomb structure,and the two gradient honeycomb structures of thickness gradient and material gradient are studied.The two gradient honeycomb structures are compared with the traditional honeycomb,the differences between the properties are obtained,and the mechanical properties of the gradient honeycomb structure are deeply understood.Finally,the negative Poisson’s ratio concave honeycomb structure is optimized,and the optimization sequence and basic concept are described.The in-depth analysis is carried out in three aspects:experimental design,approximate model and optimization algorithm.Taking the mass and total energy absorption of concave honeycomb structure with negative Poisson’s ratio as the optimization object,the range of structural parameters is limited,and the whole optimization process is completed.Through the study of the concave honeycomb structure with negative Poisson’s ratio,it is determined that the parameter change of the single cell structure will have a great impact on the honeycomb structure.The gradient honeycomb structure can effectively improve the mechanical properties and has stronger crash worthiness compared with the traditional honeycomb structure,while the thickness gradient honeycomb structure has a more far-reaching impact on the performance of the honeycomb structure compared with the material gradient honeycomb structure,Finally,it is known that the optimized concave honeycomb structure with negative Poisson’s ratio can effectively improve the energy absorption capacity of the structure.