摘要
基于简化的超折叠单元理论和基本单元法,提出了一种预测多边形薄壁多胞管平均压溃力的理论模型,并通过数值模拟得到了内部添加肋板的四、六、八边形薄壁多胞管在准静态轴向压缩过程中的变形模式和吸能特性。结果表明:理论预测和数值模拟与以往的实验结果吻合较好。在内部添加肋板可显著提高多边形薄壁管的吸能特性,四、六、八边形管内部添加十字型肋板比添加X型肋板的薄壁多胞管的吸能能力提高更多,比吸能分别提升了68.936%、17.725%和15.297%。正则化平均压溃力与有效压缩距离因子和边厚比有关,且随着边厚比的增大而增大。多胞管的正则化平均压溃力高于对应的单胞管。
Based on the simplified super folding element(SSFE)theory and constitutive element(CE)method,a theoretical model was proposed to predict mean crushing force of polygonal thin-walled multi-cell tube.The deformation modes and energy absorption character of square,hexagon and octagon thin-walled multi-cell tube with inner panels were obtained by using numerical simulation under quasi-static axial compression.The results show that theoretical predictions and numerical simulation are in good agreement with previous experimental results.The energy absorption character of polygonal thin-walled multi-cell tube can be improved by adding inner panels.The improvement of specific energy absorption of square,hexagon and octagon thin-walled multi-cell tube with cruciform panel is greater than that of the tube with X-shaped panel,and increases by 68.936%,17.725%and 15.297%,respectively.The normalized mean crushing force is related to effective crushing distance factor and width-thickness ratio,and increases with the increase of width-thickness ratio.The normalized mean crushing force of the multi-cell tube is higher than that of the corresponding single-cell tube.
作者
靳明珠
尹冠生
姚如洋
史明辉
刘亚红
JIN Ming-zhu;YIN Guan-sheng;YAO Ru-yang;SHI Ming-hui;LIU Ya-hong(School of Science,Chang'an University,Xi'an 710064,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2020年第10期192-202,共11页
Journal of Plasticity Engineering
基金
长安大学中央高校基本科研业务费专项资金资助项目(300102129721)
长安大学开放创新实验室项目(2018CXSY06)。
关键词
薄壁多胞管
吸能
轴向荷载
平均压溃力
thin-walled multi-cell tube
energy absorption
axial loading
mean crushing force
作者简介
通信作者:尹冠生,男,1958年生,博士,教授,主要从事结构动力学和工程力学研究,E-mail:yings@chd.edn.cn;第一作者:靳明珠,女,1995年生,硕士研究生,主要从事结构防撞和吸能研究,E-mail:2018112026@chd.edn.cn。
