摘要
通过在高速列车端部吸能结构的不同区域加入诱导孔,研究不同位置的开孔方案对多胞结构的吸能特性影响。通过有限元软件LS-DYNA建立开孔结构的有限元模型,并在冲击试验数据中验证该模型的有效性,然后,分别在结构内侧、中部和外侧3个位置布置诱导孔,诱导孔类型有4孔和8孔2种,共形成6种不同诱导结构,研究结构耐撞性随位置变化的规律,并通过复杂比例评价决策方法,选择其中耐撞性最佳的开孔结构。研究结果表明:在多胞结构中加入诱导结构能够有效提高结构的褶皱数量,而在内侧加入诱导孔对于提高褶皱数量的效果好于在结构外侧加入诱导孔产生的效果,在内侧开孔能够提高结构整体的褶皱数量,而在外侧开孔能够提高部分相邻胞壁的褶皱数量,但可能会对原本规则变形的胞壁造成一定影响;在外侧加入诱导孔会使结构的峰值力更低,力波动更平稳,但会使结构出现整体屈曲变形;在内侧加入诱导孔能提升更多的吸能量和比吸能;最优开孔结构的初始峰值力降低14.20%,压溃力效率提高20.63%。
The influence of window design at different positions on the energy absorbing characteristics of multicell structure at the end of high-speed train was studied by adding induced holes in different areas.Firstly,the finite element model of the windowed structure was established with LS-DYNA,and the accuracy of the model was verified by a dynamic impact test.The crashworthiness of six induced structures,which were composed of four and eight induced hole number parameters and three position parameters,ie,inner,middle and outer,was studied.Finally,based on the complex proportional assessment decision-making method,the optimal structure was determined.The results show that the induced holes can increase the number of folds of the structure,and the effect of induced holes on the inner side is better than that on the outer side.The inner windows can increase the number of folds of the whole structure,while the outer windows can increase the number of folds of some adjacent cell walls,but it may affect the cell wall with regular deformation.In addition,the induced holes on the outside can reduce more peak forces and makes the force fluctuation of the structure more stable,but it causes the overall buckling deformation.The induced holes on the inside shows better energy absorption and specific energy absorption than those on the outside.In all structures,the optimal structure reduces the initial peak force by14.20%and improves the crushing force efficiency by 20.63%.
作者
梁习锋
陈劼昊
李治祥
马闻
许平
LIANG Xifeng;CHEN Jiehao;LI Zhixiang;MA Wen;XU Ping(Key Laboratory of Traffic Safety on Track,Ministry of Education,School of Traffic&Transportation Engineering,Central South University,Changsha 410075,China;Joint International Research Laboratory of Key Technology for Rail Traffic Safety,Central South University,Changsha 410075,China;National&Local Joint Engineering Research Center of Safety Technology for Rail Vehicle,Central South University,Changsha 410075,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2022年第5期1626-1634,共9页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51675537)。
关键词
高速列车
诱导分布
耐撞性
多胞结构
冲击载荷
high-speed train
induction distribution
crashworthiness
multi-cell structure
impact load
