CAJ | 학술논문

在发生货车被追尾碰撞时，为了达到保护后车和车上乘员的目的，必须在后防护装置的有限许可范围内，应尽可能提高碰撞发生瞬间后防护横梁和斜支撑构件的弹塑性变形所吸收的能量。本文利用LS-DYNA仿真软件对圆形横截面横梁壁厚分别为6mm、6.5mm和7mm时其缓冲吸能性进行对比分析。通过动态仿真不同壁厚的圆形横截面后防护横梁在碰撞过程中的变形、碰撞减速度以及吸能情况，表明当后防护横梁取圆形横截面时，壁厚值越小其缓冲性能最好，吸收内能最大。
재발생화차피추미팽당시，위료체도보호후차화차상승원적목적，필수재후방호장치적유한허가범위내，응진가능제고팽당발생순간후방호횡량화사지탱구건적탄소성변형소흡수적능량。본문이용LS-DYNA방진연건대원형횡절면횡량벽후분별위6mm、6.5mm화7mm시기완충흡능성진행대비분석。통과동태방진불동벽후적원형횡절면후방호횡량재팽당과정중적변형、팽당감속도이급흡능정황，표명당후방호횡량취원형횡절면시，벽후치월소기완충성능최호，흡수내능최대。
In the event of a collision, in order to protect the vehicle and the passengers in the after car, protection beam and diagonal brace should as far as possible increase energy absorption at the collision moment. In this paper, by using the LS-DYNA software ,the energy absorption of circular cross section beam is analysed ,whose wall thickness are respectively 6mm, 6.5mm and 7mm. Through the dynamic simulation of deformation,impact deceleration and energy absorbing, showed that when the rear protection beam taking a circular cross section, the smaller the thickness of buffer performance is the best, the maximum absorption.