Bending collapse of multi-cell tubes
Bending collapse of multi-cell tubes
复制标题
多室管的弯曲塌陷
DOI：
10.1016/j.ijmecsci.2017.10.029
复制
发表时间：
2017-12
影响因子：
7.3
通讯作者：
Li Zhenhuan
中科院分区：
文献类型：
--
作者：
Wang Zong;Zhang Xiong;Li Zhenhuan
多室梁由于具有良好的弯曲破坏吸收能量的性能，被广泛用作防护结构的构件。然而，对其反应的理论预测仍然是一个未解决的问题。本文采用无量纲分析和能量分析两种方法推导了多室管的弯矩响应。首先对不同截面尺寸的双胞管进行了数值模拟。然后采用无量纲分析方法，将双胞管的弯矩与宽厚比b/t、流动应力和弯曲转角进行关联。在Kecman模型的基础上，建立了双胞管的理论模型，并根据系统的能量平衡推导了系统的弯矩响应。最后，确定了能量分析方法中塑性铰线滚动半径的表达式，以架起两种方法之间的桥梁。比较表明，两种方法的预测结果与数值结果吻合较好。用四胞管对方法进行了验证，结果表明该方法适用于其他截面的多胞管。
Due to excellent energy absorption efficiency under bending collapse, multi-cell beams are extensively used as the components of protection structures. However, the theoretical prediction of their responses is still an unsolved problem. In this paper, two methods: dimensionless analysis method and energy analysis method are employed to derive the bending moment response of multi-cell tubes. Numerical simulations of double-cell tubes with different section dimensions are conducted first. The dimensionless analysis method is then employed to correlate the bending moment of double-cell tubes with the ratio of width to thicknessb/t, the flow stress and the bending rotation angle. Based on Kecman's model, a theoretical model of double-cell tubes is presented and the bending moment response is derived according to the energy equilibrium of the system. Finally, the expression of a rolling radius of plastic hinge lines in the energy analysis method is determined to bridge the two methods. A comparison shows that the predictions provided by the present two methods agree well with the numerical results. Quadruple-cell tubes are also employed to validate the present methods and results show that the present methods are applicable for multi-cell tubes with other cross-sections.
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