不同诱导结构对折叠式压溃管动态吸能影响  

Dynamic crashworthiness analysis of fold-collapse tube with different induced structures

作　　者：梁玉 姚松[1] 许平[1] 周志鹏 LIANG Yu;YAO Song;XU Ping;ZHOU Zhipeng(Key Laboratory of Traffic Safety on Track of Ministry of Education,School of Traffic&Transportation Engineering,Central South University,Changsha 410075,China)

机构地区：[1]中南大学交通运输工程学院,轨道交通安全教育部重点实验室,湖南长沙410075

出　　处：《铁道科学与工程学报》2018年第8期2072-2082,共11页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51275532,U1334208);“十二五”国家科技支撑计划项目(2015BAG13B01);“十三五”国家重点研发计划项目(2016YFB1200602-33)。

摘　　要：建立带预压结构的折叠式压溃管有限元模型,得到其动态冲击下轴对称变形模式和撞击力-位移曲线,对折叠压溃管进行动态冲击实验,有限元仿真结果与实验结果的变形模式和撞击力-位移曲线吻合良好,验证了有限元模型的准确性。通过仿真分析发现预压缩能减小圆管在动态冲击下的第1个褶皱波长,但对整体变形模式和撞击平台力大小基本无影响。在此基础上,对无预压圆管开设4种不同的诱导结构:外表面开槽诱导和内外表面交替开槽诱导、外波纹诱导、内外表面波纹管诱导,分析发现内外表面交替开槽和内外波纹管诱导结构能控制圆管的变形模式,外表面开槽诱导对圆管的褶皱波瓣形状有一定影响,外表面波纹诱导会让圆管呈现一定的非对称变形。与初始圆管相比,4种诱导圆管中,只有外部开槽诱导下的圆管比吸能增大,同时载荷波动系数减小29.4%,撞击平台力与初始圆管基本相当。本文可为折叠式压溃管吸能特性优化提供参考。The FE model of fold-collapse tube with pre-compressing structure was established in this paper.The deformation mode of tube was axisymmetric and the crushing force curve was obtained.Dynamic impact experiment was conducted and the result of FE simulation and experiment are in good agreement,which validates the correctness of FE model.It is found that the pre-compressing structure can reduce the first wrinkle’s wavelength but have little influence on deformation mode and crushing force.Four different induced structures were set on the circular tube,which are grooves on external surface,grooves on internal and external surface,corrugation on external surface,and corrugation on internal and external surface.The induced structures with grooves on internal and external surface and corrugation on internal and external surface can change and control deformation modes of circular tube.The grooves on external surface affect the shape of wrinkle lobes and the corrugation on external surface makes the deformation mode asymmetric.In whole fold process,compared with the initial tube,only the induced structures with grooves on external surface can increase the SEA(Specific Energy Absorption),decrease the ULC(undulation of load-carrying capacity)by 29.4%and maintain the fairly mean crushing force at the same time.Therefore,it can be the optimization foundation of the fold-collapse circular tube to realize better crashworthiness characteristics.

关 键 词：折叠式压溃管 预压缩 诱导结构 载荷波动系数 

分 类 号：U270[机械工程—车辆工程]