Theoretical prediction and crashworthiness optimization of thin-walled structures with single-box multi-cell section under three-point bending loading
Theoretical prediction and crashworthiness optimization of thin-walled structures with single-box multi-cell section under three-point bending loading
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DOI：
10.1016/j.ijmecsci.2019.05.013
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发表时间：
2019-07
影响因子：
7.3
通讯作者：
Zhanpeng Du;L. Duan;A. Cheng;Zhidan Xu;Guangyao Zhang
中科院分区：
文献类型：
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作者：
Zhanpeng Du;L. Duan;A. Cheng;Zhidan Xu;Guangyao Zhang
本文旨在研究单箱多室截面薄壁结构的弯曲倒塌行为和吸能机理。建立了三点弯曲载荷下TWS-SMC的理论预测模型。将TWS-SMC分为腹板部分和法兰部分，推导了理论预测公式。通过三点弯曲试验和有限元分析，验证了理论预测公式的准确性和通用性。为了进一步验证理论预测公式，提高TWS-SMC的吸能能力，采用理论预测公式和基于有限元分析的代理模型对TWS-SMC进行耐撞性优化。结果表明：(1)理论预测公式得到的Pareto边界与基于有限元模型的Pareto边界具有很好的一致性，表明理论预测公式可以直接用于耐撞性优化设计，以提高计算效率；(2)在相同重量下，TWS-SMC的吸能能力优于单箱单室截面薄壁结构(TWS-S1C)，并且随着腹板部件数量的增加，其吸能能力将逐渐提高。
This paper aims to study the bending collapse behavior and energy absorption mechanism of thin-walled structures with single-box multi-cell section (TWS-SMC). A theoretical prediction model of TWS-SMC is developed under three-point bending loading. The theoretical prediction formulas are also derived by dividing the TWS-SMC into web parts and flange parts. The accuracy and generality of the theoretical prediction formulas are validated by performing three-point bending test and finite element analysis (FEA). To further validate the theoretical prediction formulas and improve the energy-absorption capacity, both theoretical prediction formulas and FEA based surrogate models are employed to perform the crashworthiness optimization of the TWS-SMC. The results show that (i) the Pareto frontiers obtained from the theoretical prediction formulas show an excellent coincidence with those from the FEA based surrogate models, which means that the theoretical prediction formulas can be directly used to crashworthiness optimization design for the sake of computational efficiency; (ii) the energy-absorption capacity of TWS-SMC is superior to thin-walled structures with single-box one-cell section (TWS-S1C) under the same weight, and its energy-absorption capacity will improve gradually with the number of web parts increased.