一种多层嵌套薄壁管的吸能特性仿真分析  

SIMULATION ANALYSIS FOR ENERGY-ABSORPTION PROPERTIES OF A NESTED SQUARE THIN-WALLED TUBE

作　　者：余明阳[1] 米彩盈[1] YU MingYang;MI CaiYing(School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China)

机构地区：[1]西南交通大学机械工程学院,成都610031

出　　处：《机械强度》2018年第2期472-476,共5页Journal of Mechanical Strength

基　　金：国家国际科技合作专项项目(2013DFA71330)资助~~

摘　　要：为了提高薄壁金属管的耐撞性能,提出一种多层嵌套方形薄壁管结构。应用非线性显式有限元法对多层嵌套薄壁管的吸能特性进行了仿真分析,并与普通方管和对称四胞管进行了对比,分析结果表明:在轴向碰撞过程中,多层嵌套薄壁管的变形模式为稳定的渐进层叠变形,其比吸能为25.72 k J/kg,较普通方管和对称四胞管分别提高了64%和31%;通过减小内嵌壁的壁厚可以达到结构轻量化设计目标;通过缩短内嵌壁和约束筋的高度可以有效地降低碰撞初始峰值载荷。将多层嵌套结构应用到薄壁管结构设计中可以有效地提高薄壁管的耐碰撞性能,为车辆吸能元件研究和工程应用提供了参考。In order to improve the crashworthiness performance of the thin-walled metal tube,it presents a nested square thin-walled tube structure. The nonlinear explicit finite element method is used to study the energy-absorption characteristics of the nested square thin-walled tube. The results show that： during the collision happening in the axial direction,the deformation mode of the nested square thin-walled tube is asymptotic telescoping deformation; the specific energy absorption of the nested square thin-walled tube is 25. 72 kJ/kg,which is about 1. 64 times and 1. 31 times higher than the ordinary square tube and symmetrical four cells tube; reducing the thickness of the embedded walls can achieve the lightweight design target and shortening the height of the embedded walls and ribs can effectively reduce the initial peak crushing force. The nested structure can effectively improve the crashworthiness of thin-walled tubes. The research results provide a reference for the further research and engineering applications of vehicle energy-absorbing element.

关 键 词：多层嵌套薄壁管 显式有限元法 耐撞性 轴向冲击 

分 类 号：TH122[机械工程—机械设计及理论]