Design And Simulation Research Anout Composite Material On Car Energy Absorption Device

Automotive passive safety has been a hot research topic at home and abroad.As a primary protection component under car collision, the crash performance ofbumper is directly related to the automotive passive safety performance. Thispaper focuses on the crash structure of the bumper based on the analysis ofrelevant research developments at home and abroad, considering compositematerials as a starting point and with LS-DYNA and VPG simulation analysis,finally make a design of high efficiency, light weight composite crash structure.The main work of this paper is as follows:1. Summed up the domestic car crash device application development processand analyze the history of position and material changes of the crash device.Discussed the shortcomings of traditional car crash device and gives a newmaterial-carbon fiber composite application design based on the characteristicsof collision energy absorption and weight reduction.2. Introduced the basic theory of mechanics of composite materials andstructural design; review the application of composite materials and collisiontheory of finite element methods. Give a theoretical basis and methods course forthe subsequent composite energy absorbing device design, optimization andvalidation.3. Studied the mechanical properties of composite laminates. Firstly, thefinite element method laminate structure, and then using finite element techniques,respectively, through crash simulation tests under low and high speed, comparedto the crash performance of ordinary structural steel, high strength steel, aluminumalloy and composites. Verified specific energy absorption, the peak of impact forceand plastic deformation and prove the advantages of composite materials used inthe collision energy absorption device. In addition, studied the effects of differentcross-sectional shapes of the structural performance and provide a reference forsubsequent composite design.4. Simulated a steel collision energy absorbing device to get parameters of theinitial impact force peak crush displacement, the total energy absorption andspecific energy absorption and provide data for the design of composite alternativedesign.5. Design and optimization of composites energy absorbing device. Accordingto the general principles of structural design and test conclusions and combined with the actual products, preliminary design of composite energy absorbing device.Then use the crash simulation tests account for its performance parameters wereoptimized overlay and structure. Final results showed that ensure the needs of itsrigidity and crash performance, the new device is a former steel quality36.98%,15.05%increase in energy absorption, energy absorption is three times more thanconventional steel parts.6. Composite energy absorbing device in a vehicle crash simulation validationanalysis. According to the C-NCAP standards, simulated vehicle that has beeninstalled composites energy absorbing device. Finally get the car engine relativedisplacement, B pillar deformation and longitudinal acceleration and bumperenergy absorption characteristic parameters. The results showed that, compared tothe original steel structure, when the vehicle collision, composite apparatus canreduce the relative displacement of the engine rearward1.77%, B pillarlongitudinal acceleration slows60.14%, energy absorbing bumper systemincreased by12.03%; effectively improve the passive safety performance ofvehicles.