Multiobjective optimization of perforated square CFRP tubes for crashworthiness
Multiobjective optimization of perforated square CFRP tubes for crashworthiness
复制标题
多孔碳纤维增强塑料方管的耐撞性多目标优化
DOI：
10.1016/j.tws.2020.106628
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发表时间：
2020-04-01
影响因子：
6.4
通讯作者：
Li, Qing
中科院分区：
文献类型：
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作者：
Liu, Qiang;Liufu, Kangmin;Li, Qing
开孔和开孔已被广泛应用于各种工程目的的复合材料结构中。然而，穿孔可能会在很大程度上改变结构的响应和碰撞行为，从而给复合材料设计带来巨大的挑战。为提高碳纤维增强塑料(CFRP)方管的结构耐撞性，对其穿孔参数进行了参数研究和优化设计。首先，通过实验验证，建立了穿孔方管的有限元模型。其次，通过参数研究，建立了关于射孔设计变量的耐撞性指标的支持向量回归(SVR)替代模型。结果表明，开孔半径对CFRP管的耐撞性影响最大，其次是开孔的高长比和偏宽比。最后，将代理建模技术与多目标灰狼优化算法相结合，对射孔参数进行多目标优化。优化设计使比能量吸收(SEA)提高了100.47%(从29.61J/g增加到59.36J/g)，而第一峰值载荷(F-max)仅有4.62%的微小损失(从81.22kN增加到84.97kN)。
Open holes and cutouts have been widely used in composite structures for various engineering purposes. However, perforation could largely alter the structural responses and crashing behavior, thereby creating significant challenge in composite design. This study carried out a parametric study and design optimization on the perforation parameters for the perforated carbon fiber reinforced plastic (CFRP) square tubes to improve the structural crashworthiness. First, a finite element model was established for perforated square tube through experimental validation. Second, the support vector regression (SVR) surrogate models of the crashworthiness indices were established with respect to the perforation design variables following a parametric study. It was found that the radius of the hole had the most significant effect on crashworthiness performance of the CFRP tube, followed by the height-to-length ratio and the offset-to-width ratio of the hole. Finally, the multiobjective optimization was performed to optimize the perforated parameters by integrating the surrogate modeling technique and multiobjective grey wolf optimizer (MOGWO). The optimal design enabled to enhance 100.47% in the specific energy absorption (SEA) (specifically from 29.61 J/g to 59.36 J/g) only with a minor sacrifice of 4.62% in the first peak load (F-max) (from 81.22 kN to 84.97 kN).