轿车热冲压保险杠的柱类碰撞耐撞性  

Pole impact crashworthiness of hot stamping front bumper of a car

作　　者：林建平[1] 舒常乐 金建伟[2] 王灿[1] 王晓娜[2] 姚再起[2] 

机构地区：[1]同济大学机械与能源工程学院 [2]吉利汽车研究院

出　　处：《汽车安全与节能学报》2015年第2期134-138,共5页Journal of Automotive Safety and Energy

基　　金：国家"十二五"科技支撑计划项目子项(2011BAG03B02);国家自然科学基金(51375346)

摘　　要：研究了汽车前保险杠与柱类物(如电线杆或大树的垂直硬物)耐碰撞性能。为降低保险杠的质量,某轿车采用了超高强度热冲压含硼钢。针对该类保险杠进行了落锤试验。用有限元模型进行了柱碰性能模拟,并分析了不同板厚的前保险杠耐撞性。选取了前保险杠的变形、受力及吸能3个参量作为柱碰过程的评判指标。结果表明:柱类碰撞时,对比原冷冲压保险杠,热冲保险杠的最大内侵量减小40 mm,最大承载力提高7 k N,最终吸能量提高0.1 k J。因而,热冲压保险杠具有更加优异的柱碰性能。The impact crashworthiness between front-bumper and pillars （such as telegraph poles or trees） was investigated. Some drop hammer impact tests were done for a car with its front-bumper being built from ultra-high-strength hot-stamping boron-steel to reduce the bumper mass. The impact crashworthiness were simulated and analyzed for the bumper with different thickness by a special finite element model with the deformations, the stresses, and the energy absorption conditions of a front-bumper being taken as evaluation indexes. The results show that the front-bumper using ultra-high-strength hot-stamping boron-steel reduces 40 mm within the biggest deformation, increases 7 kN within the biggest stress, and increases 0.1 kJ within the energy absorptions compared with the original bumper from cold-stamping steel. Therefore, the hot-stamping front-bumper has more excellent pole impact crashworthiness.

关 键 词：汽车安全 柱类碰撞 耐撞性 热冲压 保险杠 

分 类 号：U469.91[机械工程—车辆工程]