New Type Variable Cross-section Energy-absorbing Boxes Of Axial Compression Experimential And Numerical Simulation

Thin-walled metal because of its light weight,easy processing,low cost and stable plastic deformation and energy absorption characteristics of good performance,often used as an energy-absorbing components.Automotive energy-absorbing boxes as the object of study in this paper proposed a new type of energy-absorbing boxes with tapered design.Using the method of experiment and numerical simulation study,in-depth study on the energy absorption properties.Work as follows:(1)of variable cross-section thin-walled tubes do experimental study on quasi-static,found the transition smooth gradients with different thickness of tube,with good surface quality,40%weight loss and energy absorption,stability and so on.(2)Use two kinds of variable cross section of material,a smooth differential plate(TRB,Tailor Rolled Blanks),another for laser tailor welded blanks(TWB,Tailor Welded Blanks).To compare their strengths and weaknesses,and making smooth differential thickness tube,smooth differential thickness in square tube,tailor welded tubes and tailor welded square tube.(3)Use the quasi-static test method,make the axial compressive test on the smooth difference thickness tube and tailor welded tube.Under the same experimental conditions,do comparision on two same size tube,from results we found that smooth differential energy absorption ability is superior to the tailor welded tube.Similarly,under the same conditions smoothly with different thickness in square tube with laser welded square tubes do the same experiment,experimental results show that the smooth energy absorption performance than the tailor welded in square tube welded square tube.Finally,put smooth differential thickness tube and square tube together for compairsion result is that,energy absorption performance of tube is better than square tube.(4)Work on the ABAQUS software,based on the physical dimensions of the model and equipment parameters,to do axial quasi-static simulation analysis.Simulation results were compared with experimental data,load-displacement curves of the two in line.Can be determined,finite element analysis,can really reflect test results.(5)To consider automotive plant for automotive energy-absorbing box design requirements,based on cross-section energy-absorbing box,this thesis is using the method of finite element analysis to dynamic simulation analysis for axial crushing.Square cross-section energy-absorbing box,divided into thin,thick,and transition zone.With smooth transition zone,good surface quality,light weight,deformation,stability and energy-absorption characteristics of good performance.(6)Designed three programmes,namely the thin area in the front,in the thin area Central,in front-central of the energy-absorbing box,a total of 12 different models.Based on equality of equal length,impact energy,the same parameter settings,by setting a different thickness and length of 12 different models,their crushing mode,load and energy absorption by comparison.Study results showed that the designs of energy-absorbing boxes with cross-section energy-absorbing box,thin area in the front and thin area length,the longer the average impact is more stable,more energy absorption.Conclusions of this paper on the design of automotive energy-absorbing boxes have reference value.