The deformation mechanism analysis of a circular tube under free inversion

The deformation mechanism analysis of a circular tube under free inversion
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圆管自由翻转变形机理分析

DOI:
10.1016/j.tws.2016.05.019
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发表时间:
2016-10
影响因子:
6.4
通讯作者:
Yu T. X.
Yu T. X.
中科院分区:
工程技术2区
文献类型:
--
作者:
Qiu XinMing;Yu XiaoHuan;Li YiLiang;Yu T. X.

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作为一种常用的薄壁吸能器设计,自20世纪60年代以来,人们就开始对自由翻转的圆管进行理论研究。然而,现有的模型均假定翻转截面为半圆形,即,反转区域中的曲率是常数。在这项研究中,从平衡的一个代表性的元素,曲率被发现是变化的,由于弯矩分布。通过相应的有限元模拟验证了变曲率的结论,并通过建立变曲率模型,从理论上研究了钢管在自由翻转下的变形机理。考虑到弯曲和拉伸的相互作用,该模型预测的稳态反向载荷和转向节半径与有限元模拟结果以及文献中的实验数据吻合较好。
As a popularly adopted design of thin-walled energy absorber, a circular tube under free inversion has been studied theoretically since 1960s However, in all the existing models, the profile of inversion is assumed to be a semi-circle, i.e., the curvature in the region of inversion is a constant. In this study, from equilibrium of a representative element, the curvature is found to be varying, due to bending moment distribution. The conclusion of varying curvature is verified by the corresponding finite element simulations.Then the deformation mechanism of a tube under free inversion is theoretically investigated by establishing a curvature varying model. Considering the interaction of bending and tension, the steady inversion load and knuckle radius predicted by current model agree well with those obtained from FE simulations as well as the experimental data published in literature.
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