Research Of Automobile Crash And Optimum Structure Of Bumper

With the growth of the amount of automobile, the number of traffic accident is becoming more and more big, and it has brought serious disasters to life and property. So the research of the safe technology of the vehicle has already become an important subject in current studied technology to automobile. Bumper crashes are very common scenes in car crash accidents. Bumper is a very impotant part in car body. On one hand, bumper can absorb impact energy and come back its shape after crash in the ease of low-speed ear crash, on the other hand, wallop will be leaded to whole car through it in the ease of high-speed ear crash, avoiding a great distortion and protecting car and passengers. In the survey, the frontal crash takes the first place in all accidents. Take this understanding, this paper studies the frontal simulation, then analyse the strength of the bumper analys, and optimize structure of the bumper.This paper first built the jetta car geometric model that contain body、 frame and engine, then the model is imported to ANSYS/LS-DYNA software.The car model is calculated and analysed the crash at Frontal Full Wall, Frontal40%Offset and Frontal cylinder situaion by ANSYS/LS-DYNA software, and got the results of displacement, speed, acceleration and crash energy dissipation. Compared with the test results to verify the accuracy of the simulation results. According to the results, the most harm to the vehicle is Frontal cylinder, minor is Frontal40%Offset, the least is Frontal Full Wall. In this paper, reference resourse was gave to further simulation of car crash..Summarized the result of simulation of the car crash, this paper put forward a method of checking strength of bumper by crash wallop, and analysed the structure strength of detailed bumper model, got stress and displacement result.The results beyond the limit of the yield of materials, bumper is possible to break. Then, optimized structure of the old bumper with three methods and analysed the structure strength of new bumper.After optimization, bumper stress become less than the limit of the yield of materials. Thus proving the feasibility of optimizing.