Design And Research Of Energy Absorbing Device For Side Door

As the number of cars increases year by year and the transportation demand becomes more and more complex,traffic accidents are increasing,especially side collisions,which not only account for a large proportion,but also have extremely high injury and death rates.At present,the section shape and material of the anti-collision rod are generally changed to improve the anti-collision performance.However,due to its complex structure and tedious production,the cost of processing will increase a lot.Therefore,it is of great significance to study the energy-absorbing components of the anti-collision rod to make the automobile meet the requirements of light weight,high energy-absorbing capacity and strong safety performance.Firstly,the dynamic model of the energy-absorbing component of the automobile anti-collision rod is established,and the dynamic crushing load and energy of the energy-absorbing component are derived from the collapse load and energy formula under quasi-static condition,which provides a theoretical basis for the follow-up research.According to the structure size of the anti-collision rod of a car,the size range of the energy-absorbing components is designed to ensure that the height of the energy-absorbing components and the total weight of the increased anti-collision rod remain unchanged.Secondly,ABAQUS was used to analyze the influence trend of different wall thickness and diameter on the energy absorption characteristics of the energy-absorbing member under the static condition of single factor,and the corresponding quasi-static crushing test was carried out on the universal test machine.Thirdly,the single factor dynamic finite element analysis is done by putting the energy absorbing member into the anti-collision rod.Using the control variable method,the influence trend of single factor filling percentage,wall thickness,diameter and root number of different energy-absorbing components on the energy-absorbing characteristics of anti-collision rod was preliminarily predicted.In order to meet the design requirements of automobile low quality,the energy absorbed per unit mass is evaluated.It is concluded that when other variables remain unchanged,the 100% filling effect is good,and the larger the diameter,wall thickness and root number are,the better the energy absorption of anti-collision rod is.Finally,the different schemes of bumper energy-absorbing component in finite element analysis,response surface by n-D than energy absorption,n-t response surface,D-t than energy absorption than can response surface absorption,the research of different diameter,wall thickness,bumper can count component to the root of the three factors interaction influence on bumper energy absorption characteristics,further determine the correlation of variables and responses,and compared with single factor conditions.The optimal curve is fitted according to the data obtained from different schemes,in which the objective function is specific energy absorption,the variables are diameter,wall thickness,the number of roots of energy-absorbing members,and the constraint is the total mass increased by the new type of anti-collision rod(the sum of all energy-absorbing members is unchanged).Through the intersection of the constraint surface and the response surface to form a response curve,it is concluded that when n=8,D=1.812 cm,and t=0.595 cm,the specific energy absorption value is the largest and is the optimal solution.The new anti-collision rod under its structural parameters is compared with the traditional hollow steel pipe anti-collision rod.In terms of deformation form,the intrusion of the optimized anti-collision rod is smaller than that of the traditional anti-collision rod,and the peak load is increased by 41.55%,the specific energy absorption is increased by 50.79%,the mass is increased by 17%,and the energy is increased by 80.27%.It can be seen that the mass of the optimized anti-collision rod is increased by17%,while the energy is increased by 80.27%.Less mass is added,but more energy is absorbed.The added weight is 161.06 g,and the weight of the sedan is 1000 Kg,which is0.016% of the weight of the automobile.Therefore,it is of certain significance to study the anti-collision energy absorption of the energy absorbing member.