A theoretical study of the expansion metal tubes
A theoretical study of the expansion metal tubes
复制标题
金属膨胀管的理论研究
DOI：
10.1016/j.ijmecsci.2016.05.014
复制
发表时间：
2016
影响因子：
7.3
通讯作者：
Qiu XinMing
中科院分区：
文献类型：
--
作者：
Liu Yuzhe;Qiu XinMing
金属管作为一种重要的吸能装置，采用有限元模拟得到的变形机理，通过建立理论模型，对芯棒圆锥模头上金属管的胀形进行了研究。与以往基于动量方程的理论分析不同，本模型从能量守恒的角度出发。也就是说，在膨胀管的稳定阶段变形中，压缩力所做的外功应该通过周向膨胀、子午线方向弯曲和摩擦来耗散。理论模型对于刚性、理想塑性(R-PP)材料，无论有或没有应变硬化效应，都提供了稳态压缩力和膨胀后的管半径的预测。与已有的实验数据以及相应的有限元模拟结果相比，目前的理论分析预测的稳态压缩力都是相当准确的。
As an important type of energy absorption devices, the expansion of metal tubes over a mandrel conical die are investigated by proposing a theoretical model, in which the deformation mechanism enlightened by finite element simulation is adopted. Different to the previous theoretical analysis that base on the momentum equations, the present model starts from the energy conservation point of view. That is, in the steady stage deformation of an expansion tube, the external work done by the compressional force should be dissipated by expansion in circumferential direction, bending in meridional direction, and friction.The theoretical model provides the predictions of steady compressional force and the tube radius after expansion, for rigid, perfectly plastic (R-PP) material, with or without strain hardening effect. Compared with the existing experimental data, and also the corresponding finite element simulations, the steady compressional force predicted by current theoretical analysis are both quite accurate.