On the bending force response of thin-walled beams under transverse loading
On the bending force response of thin-walled beams under transverse loading
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横向荷载作用下薄壁梁的弯曲力响应研究
DOI：
10.1016/j.tws.2020.106807
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发表时间：
2020-09
影响因子：
6.4
通讯作者：
Fu Xinrong
中科院分区：
文献类型：
--
作者：
Huang Zhixin;Zhang Xiong;Fu Xinrong
在横向碰撞中，薄壁梁可能以任意位置和角度与各种形状和尺寸的撞击物发生碰撞。此外，梁总是固定在其他结构部件上。然而，这些事实被忽视，在目前的研究弯曲倒塌。本文旨在研究这些因素对薄壁梁横向弯曲响应的影响。首先对不同加载角度、加载位置和加载跨度的铝合金方梁进行了准静态三点弯曲试验。然后利用非线性有限元程序LS-DYNA模拟试验。在实验验证的基础上，利用有限元模型进行参数化研究，分析了各种因素对薄壁管失稳响应的影响，并讨论了力响应随这些因素变化的范围。结果表明，冲头形状、尺寸、加载位置和角度的变化会导致变形模式的转换，而加载速度和碰撞盒高度对变形模式的影响很小。增加加载速度会导致更高的峰值力，而将梁固定在较短的碰撞盒上会实现更高的力水平。在所有情况下，在跨度中间垂直加载的尖冲头控制破碎力的下限，而上限由冲头以小角度接近支撑件来控制。计算结果表明，随着载荷和边界因子的变化，梁的平均破碎力可增加78%。本文的研究结果对薄壁梁在横向载荷作用下的耐撞性设计具有一定的参考价值。
In lateral crashes, thin-walled beams may collide with impactors with multifarious shapes and sizes at any position or angle. In addition, the beams are always fixed on other structural components. However, these facts are ignored in the present studies on the bending collapse. This paper aims to investigate the influences of such factors on the transverse bending responses of thin-walled beams. Quasi-static three-point bending tests are conducted first for aluminum square beams loaded at different load angles, positions and spans. The non-linear finite element code LS-DYNA is then utilized to simulate the tests. After validated by the experiment, the finite element model is employed to perform parametric studies to investigate the influences of various factors on collapse responses of thin-walled tubes, and the ranges of the force responses with the variation of these factors are discussed. Results show that the variation of punch shape and size, load position and angle may lead to the switch of deformation modes, while the loading velocity and the height of crash boxes have very small influences on the deformation patterns. Increasing the loading velocity results in a much higher peak force, and fixing the beams on shorter crash boxes achieves a higher force level. In all cases, a sharp punch perpendicularly loaded in the middle of the span controls the lower bound of the crushing force, while the upper bound is governed by the punch approaching the support with small angles. The mean crushing force of the beams can be increased by up to 78% with the variation of the load and boundary factors in the calculations. The findings of this work would be helpful on the crashworthiness design of thin-walled beams under transverse loads.
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