Abstract
The strain rate is one of the main factors that determines the yield strength of the material, which has a great influence on the accuracy of the numerical simulation of the automobile crash box. The numerical simulation of the crash box considering the strain rate of the material is carried out, and found that the impact force on the longitudinal beam of the car body is large and the energy absorption ability is small during the collision process. Through two sets of optimization studies, the results show that increasing the double-sided convex groove at the proper position of the front crash box can effectively reduce the impact force transmitted to the car body at the initial stage of the collision, and at the same time reduce the energy absorption ability of the crash box; Adding double-sided grooves at the front crash box can make the crash box collapse smoothly, cut down the collision force transmitted to the car body, and increase the energy-absorbing ability. At the same time, the results of the two optimization designs are verified by the methods: the sense of crushing deformation and the average square of all nodes velocity.
Highlights
With the rapid development of Chinese industry, China's automobile industry has made unprecedented achievements
The impact force transmitted to the body during the collision process can be evaluated by the average stress of the unit at the back end of the crash box connecting the longitudinal beam and the energy absorption ability can be evaluated from the mean acceleration of all nodes that compose the crash box
For the whole collision process, the mean stress of all elements transmitted to the back end is 250.7 MPa., which indicates that the impact force of the whole collision process the longitudinal beam to the car body is larger, especially the International Journal of Mechanical Engineering and Applications 2020; 8(2): 75-80 final impact force
Summary
With the rapid development of Chinese industry, China's automobile industry has made unprecedented achievements. The study of the automobile crash box and its performance optimization are of great significance to improve the passive safety of the vehicle and to protect the safety of drivers and passengers. BELINGARDI studied the response of the metal bumper beam under low speed impact and discussed the influence of the reinforcement bars and the thickness of the crash box on its performance [12]. Most of these studies focus on the optimization design of the crash box for low speed collision, and less research on the influence of strain rate on the yield strength of the material during collision. In order to solve these problems, the optimal design of the crash box is studied
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