Axial crushing and optimal design of square tubes with graded thickness
Axial crushing and optimal design of square tubes with graded thickness
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分级厚度方管的轴向破碎及优化设计
DOI：
10.1016/j.tws.2014.07.004
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发表时间：
2014-11-01
影响因子：
6.4
通讯作者：
Zhang, Hui
中科院分区：
文献类型：
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作者：
Zhang, Xiong;Wen, Zhuzhu;Zhang, Hui
在薄壁结构中引入截面厚度梯度是提高结构吸能效率和耐撞性能的一种很有前途的方法。本文研究了轴向载荷作用下变厚度方管的变形模式和能量吸收问题。首先对两种厚度分布的方管进行了实验研究，然后进行了数值分析来模拟实验。实验和数值计算结果都表明，在不增加初始峰值力的情况下，横截面中梯度厚度的引入可以使能量吸收效率（比能量吸收）增加30-35%。此外，采用响应面法对厚度渐变的方管截面进行了结构优化，优化结果验证了增加角部材料确实可以提高方管的吸能效率。(C)2014爱思唯尔有限公司版权所有。
Introducing thickness gradient in cross-section is a quite promising approach to increase the energy absorption efficiency and crashworthiness performance of thin-walled structures. This paper addresses the deformation mode and energy absorption of square tubes with graded thickness during axial loading. Experimental study is firstly carried out for square tubes with two types of thickness distributions and numerical analyses are then conducted to simulate the experiment. Both experimental and numerical results show that the introduction of graded thickness in cross-section can lead to up to 30-35% increase in energy absorption efficiency (specific energy absorption) without the increase of the initial peak force. In addition, structural optimization of the cross-section of a square tube with graded thickness is solved by response surface method and the optimization results validate that increasing the material in the corner regions can indeed increase the energy absorption efficiency of a square tube. (C) 2014 Elsevier Ltd. All rights reserved.