轴向预压金属圆管受轴向冲击的吸能特性研究

ENERGY ABSORPTION PROPERTIES OF AXIALLY LOADED METAL CIRCULAR TUBE UNDER IMPACT LOAD

为了研究轴向预压金属圆管在轴向冲击载荷下的力学行为和吸能特性,基于Abaqus对承受轴向预压的半径厚度比R/t为15的金属圆管轴向冲击进行了有限元分析,同时考虑到初始几何缺陷、预加载引起的初始几何形变、边界条件等因素的影响,在有限元仿真时建立了相应的对照组。仿真结果表明:(1)固定端简支条件下比固支条件下出现的变形模式更为复杂,吸能特性和其对应变形模式有很大关系,当非对称褶皱较多时,吸能特性变差;(2)初始几何缺陷可以诱导圆管产生非轴对称褶皱,而轴向预压圆管对初始几何缺陷不太敏感,较小的预压可以抵消初始几何缺陷的作用。

In order to study the mechanical behavior and energy absorption characteristics of a metal circular tube with axial pre-compression under axial impact load. The finite element analysis was carried out based on Abaqus. A circular tube whoseR/t value is 15 was studied. At the same time,considering the influence of the initial geometric imperfections,the initial geometric deformation caused by pre-loading and boundary conditions,the corresponding control group was established in the finite element simulation. The simulation results are concluded as follows：（ 1） The deformation mode of the fixed end simply supported is more complex than the clamped case. Energy absorption characteristics and the corresponding deformation modes have a great relationship. When the asymmetric fold is more,the energy absorption characteristic becomes worse.（ 2） Initial geometric imperfections can induce circular tubes to produce non-axisymmetric folds,while the axial pre-compression tube is less sensitive to initial geometric imperfections,and the smaller pre-loading can counteract the effects of initial geometric imperfections.