A three-dimensional model of circular tube under quasi-static external free inversion
A three-dimensional model of circular tube under quasi-static external free inversion
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DOI：
10.1016/j.ijmecsci.2013.06.009
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发表时间：
2013-10
影响因子：
7.3
通讯作者：
X. Qiu;Lianghong He;Jie Gu;Xiaohuan Yu
中科院分区：
文献类型：
--
作者：
X. Qiu;Lianghong He;Jie Gu;Xiaohuan Yu
金属管的自由倒置可以应用于能量吸收装置中。现有的二维理论计算结果与实验结果存在较大的偏差，本文基于体积守恒假设和von Mises屈服准则，采用刚性、理想塑性简化方法，建立了圆管准静态自由翻转的三维解析模型。采用了厚度变化的两阶段假设，并考虑了应变沿厚度方向的沿着变化。为了验证理论模型的正确性，对铝管进行了静力反演实验，并对弹性、理想塑性材料进行了有限元计算。与试验数据和相应的有限元模拟相比，当前的三维模型提供了一个更好的预测稳定的逆温负荷比以前的二维模型。
The free inversion of a metal tube can be applied in energy absorbing devices. The existing two-dimensional theoretical predictions on the knuckle radius and the steady load all displayed large discrepancy from the experimental observations.In this paper, with the rigid, perfectly plastic simplification, a three-dimensional analytical model is proposed based on the assumption of volume conservation and von Mises yield criteria, for quasi-static free inversion of circular tubes. A two-stage assumption on the thickness change is adopted, and the strain variation along the thickness direction is also considered. In order to validate the theoretical model, static inversion experiments are performed for aluminum tubes, and finite element calculations are also carried out for the elastic, perfectly plastic material. Compared with the experimental data and corresponding FE simulations, the current 3D model provides a better prediction on the steady inversion load than the previous 2D models.