摘要
为提高轨道车辆耐撞性,提出一种轻量化镁合金鼓胀吸能结构。该结构在保证吸能性能的基础上,能极大地降低自重。首先设计镁合金鼓胀管吸能结构几何模型,并加工与之对应的实物样机。随后通过准静态压缩试验手段,开展结构力学特性研究。在压缩过程中,管结构逐步发生径向扩张塑性变形,变形模式稳定可控。在此基础上研究锥头锥角、锥头外径、吸能管壁厚等几何参数对鼓胀管吸能性能影响,研究结果表明:随着锥头锥角、外径以及管壁厚度的增大,结构的最大峰值力、平均力、吸能量及比吸能均增加。分别对比镁合金、铝合金、碳钢吸能管的特性,得出比吸能分别为10,9.6和7.6 J/g,镁合金管具有较高的比吸能。
In this paper,an energy absorption structure of a light magnesium alloy bulging tube was proposed for the crashworthiness design of rail vehicles.The structure can greatly reduces the weight on the basis of ensuring the energy absorption performance.Firstly,the geometric model of the magnesium alloy tube was designed,and the corresponding prototype was manufactured.Then,the quasi-static compression test was carried out to study the mechanical properties of the structure.During the compression process,the radial expansion plastic deformation of the pipe structure occurred gradually,and the deformation mode was stable and controllable.The influence of punch cone angle,punch outer diameter,and wall thickness of tube on energy absorption performance of tube under compression condition was analyzed.The results are as follows.With the increase of punch cone angle,outer diameter,and tube thickness,the maximum peak force,average force,energy absorption,and specific energy absorption in the process of deformation increase.Finally,the characteristics of magnesium alloy,aluminum alloy,and carbon steel energy absorption tubes were compared.The results show that the specific energy absorption is 10,9.6,and 7.6 J/g,respectively.The magnesium alloy tube has high specific energy absorption.
作者
刘莉
高宁
高峰
霍鑫龙
王帅
于尧
高广军
LIU Li;GAO Ning;GAO Feng;HUO Xinlong;WANG Shuai;YU Yao;GAO Guangjun(CRRC Tangshan Co.,Ltd.,Tangshan 063035,China;Key Laboratory of Traffic Safety on Track of Ministry of Education,School of Traffic&Transportation Engineering,Central South University,Changsha 410075,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2021年第7期1870-1876,共7页
Journal of Railway Science and Engineering
基金
国家重点研发计划资助项目(2016YFB1200505)
国家自然科学基金资助项目(51975588)。
关键词
轻质镁合金
鼓胀吸能结构
吸能特性
参数分析
light magnesium alloy
expansion tube
energy absorption characteristic
parameter analysis
