Influence Of High Speed Rear-end On The Crashworthiness Of SUV Car Body

With the further development of the automotive industry and the highway,there is a great contradiction between the development of security technology and the rising speed range,which leads to the high traffic accidents.According to statistics,more than 80 percent are collision of two or more cars rear-end in highway accidents.Due to the high impact velocity,and the impact conditions are different,the local deformation of the car body is serious,This greatly reduces the safety of cabin crew,In order to improve the crashworthiness of the vehicle and reduce the casualties,it is very necessary to study the accident form of high-speed car rear-end.Through Hyper Works and Ls-dyna software,established two cars with no crew SUV's finite element model in this paper,and verify the reliability of the simulation,with in the north American federal motor vehicle safety regulations required by the new FMVSS301,simulate the finite element by the different collision Angle collision process and overlap rate,through the deformation degree of car body parts,car body collision energy absorption and the crew compartment acceleration analysis to determine whether the car in the event of a crash when showing crashworthiness,and analyzed of occupant injury situation indirect.The results show that: 1)When the rear-end vehicle is rear-ended at a standstill with a speed of 80km/h,30%,50%,70% and 100% overlap respectively,the collision performance was the worst when the collision was 30%~50% overlap ratio;2)when the car collision Angle 0°,15°,30°,45°,under the condition of the worst working condition of crashworthiness of 0°~30°;3)in the same condition,the rear vehicle has a larger deformation than the rear one,and the impact is smal er than the rear one.