具有梯度型刚度折叠收缩管的吸能性能  

Energy Absorption of Folded Shrink Tubes with Gradient Stiffness

作　　者：陈伟东 门恒 田晓耕[1] CHEN Weidong;MEN Heng;TIAN Xiaogeng(State Key Laboratory for Strength and Vibration of Mechanical Structures,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China)

机构地区：[1]西安交通大学机械结构强度与振动国家重点实验室,陕西西安710049

出　　处：《高压物理学报》2020年第5期172-184,共13页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(11732007)。

摘　　要：薄壁管是一种常见的吸能结构,在薄壁管中引入折纹可以诱导薄壁管发生变形,有效降低薄壁管屈曲的初始峰值力并提高其能量吸收。目前,大部分折纹管受到轴向压缩时,初始峰值力后的压溃力下降显著,降低了折纹管的吸能性能。为有效提高折纹管的吸能性能,并降低折纹管的初始峰值力,在方管中引入不同形式的折纹得到折叠收缩管,利用ABAQUS/Explicit模拟设计折叠收缩管的准静态压缩,得到其变形及力与位移曲线。结果显示,与传统方管和菱形折纹管相比,折叠收缩管的初始峰值力显著降低,且压溃力随着压缩距离的增加呈梯度上升趋势,大幅提升了薄壁管的能量吸收性能。另外,系统研究了折叠收缩管的几何参数对其性能的影响,获得了性能优异的折纹管。Thin-walled tube is a common energy-absorbing structure.The introduction of folds in thinwalled tube can induce the deformation of thin-walled tube,reduce the initial peak force of buckling of thinwalled tube and improve the energy absorption of thin-walled tube effectively.At present,when the folded tubes subjects to axial compression,the crushing force decreases significantly after the initial peak force,which lowers the energy absorption performance of folded tubes.In order to further reduce the initial peak force and increase the total energy absorbed of the folded tube,different forms of folded tube are introduced into the square tube to obtain a folded shrink tube.The relation between force and displacement and deformation of the designed folded tube under the quasi-static compression is obtained by using ABAQUS/Explicit.The results show that the collapse force of the folded shrink tube is in the form of a gradient during the compression process.Compared with traditional square tube and diamond tube,the folded shrink tube not only has lower initial peak force,but also can greatly improve the total energy absorption.The influence of geometric parameters on the performance of the folded tube was studied systematically.The best performance folded shrink tubes were obtained.

关 键 词：折纹管 能量吸收 准静态压缩 有限元 梯度型刚度 

分 类 号：O347[理学—固体力学] TB124[理学—力学]