Energy Absorption Characteristic Of Thin-walled Metal Structures And Filled Polyurethane Structure

It is widely used that thin-walled structures as the energy-absorbing elements under axial impact energy absorption.Thin cylindrical shell and thin structure an,using the irreversible deformation of the structure of the material(such as plastic deformation and destruction of the composite metal material damage)can cushion the impact energy absorption.With thin-walled tubular structure to achieve effective energy absorption device design,on a collision course,serve the purpose of protecting the safety of passengers or the load.Energy-absorbing structure of the metal cylindrical shell(tube)as a thin-walled structure is one of the most effective and commonly used in energy-absorbing system has been widely promoted.On the one hand,the metal cylindrical shell failure mode is particularly stable,can better absorb energy,on the other hand,thin cylindrical shell widely applied to offshore platforms,highway guardrails structures.This article was based on the basic theory of the metal cylindrical shell buckling,using ANSYS/LS-DYNA finite element numerical simulation software,simulation of metal thin-walled structures under axial impact.And by changing its material properties,geometry(eg cross-sectional shape or aspect ratio)and filler materials to explore other means of influence on the energy absorption characteristics.The conclusion has some reference value in the practical application of the project.The main contents are as follows:1.A brief history of the development of of the thin-walled structure was introduced,It is reviewed that research status of theoretical research,experimental research and numerical simulation on Axial impact energy absorption problem.It is outlined that the basic theory of metal cylindrical shell buckling:Typical failure modes,structural dynamic response analysis and the metal shaft pressure plastic hinge.2.It is simulated that the process of metal thin-walled structures under axial impact by using ANSYS/LS-DYNA finite element numerical simulation software and make a detailed comparison.It is Analysis that different materials,different sections,different thickness of metal thin-walled structures energy absorption characteristics under the evaluation system of energy absorption.3.The energy absorption characteristics of single steel cylindrical shell,double steel cylindrical shell and steel cylindrical shell filled with polyurethane were comparative analysed under the conditions of 100mm displacement quasi-static loading and dynamic loading.The results show that steel tube filled with polyurethane have better energy absorption characteristics.The results can provide a reference for engineering applications.