高密度结构泡沫对汽车前纵梁耐撞性的影响及应用  

Effect of high-density structural foam on crashworthiness of vehicle front side-rail and its application

作　　者：吕晓江[1] 刘卫国[1,2] 颜先华[1] 张海洋[1] 周大永[1,2] 赵福全[1,2] 

机构地区：[1]浙江吉利汽车研究院有限公司 [2]浙江省汽车安全技术研究重点实验室

出　　处：《汽车安全与节能学报》2013年第2期136-141,共6页Journal of Automotive Safety and Energy

基　　金：浙江省汽车安全技术研究重点实验室建设项目(2009E10013)

摘　　要：为降低偏置碰撞时乘员腿部伤害,研究了汽车前纵梁的耐撞性及其改进。对某车型几种不同前纵梁截面,进行了弯曲压溃和轴向压溃的有限元分析。作为改进,在前纵梁延伸段内填充了高密度结构泡沫,进行了偏置碰撞试验。结果表明:填充结构泡沫后,前纵梁延伸段的变形模式得到控制,并减少了碰撞对乘员舱的侵入;与普通纵梁相比,改进后的纵梁的弯曲性能(平均载荷、吸能、比吸能)和轴向传力能力,均提高近一倍;驾驶员假人右下小腿的胫骨指数由0.97降至0.38,且小腿胫骨压缩载荷也有明显降低。因此,该设计保持了乘员舱完整性,增强了整车耐撞性。The crashworthiness of vehicle front side-rails was studied and then improved to reduce occupant leg injuries caused by offset impact. The bending crushing and axial crushing were analyzed with various sections in vehicle front side-rails using a finite element method. Improvement in the front side-rail extension, filled with high-density structural foam, was verified in an offset impact test. The results indicate that the deforming mode of the front side-rail extension is effectively controlled after filling high-density structural foam with the intrusion into the occupant cabin significantly reduced. The average load, total energy absorption, energy absorption per mass, and the axial force transmission capability are increased by nearly two times with improved front side-rail bending compared with ordinary front side-rail bending. The driver lower right leg tibia index is reduced from 0.97 to 0.38 with the driver lower leg tibia load obviously decreasing. Therefore, this design maintains the occupant cabin integrity and enhances the vehicle crashworthiness.

关 键 词：汽车安全 偏置碰撞 汽车前纵梁 耐撞性 乘员舱 高密度结构泡沫 

分 类 号：U419.3[交通运输工程—道路与铁道工程]