Crashworthiness analysis and optimization of brain-coral-inspired multilayer sandwich structures under axial crushing

IF 3.5 3区 材料科学 Q1 ENGINEERING, MECHANICAL
Zhiqiang Zhang, Peng Lin, Dayong Hu
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引用次数: 0

Abstract

Inspired by brain corals and cuttlebone, this study employed 3D printing technology to fabricate a novel bio-inspired multilayer sandwich structure based on the Hilbert space-filling curve (named BHSS). The mechanical behavior and deformation process of the BHSS were compared through quasi-static axial crushing experiments and finite element (FE) simulations. The energy absorbing characteristics of the BHSS with different layers were compared through FE simulations, and the results indicated that the 4-layer BHSS displayed superior crashworthiness. Then, parametric studies were conducted to investigate the influence of layer-height gradient and wall-thickness gradient on the energy absorption performance and deformation modes of the BHSS. It was confirmed that the double gradient designs significantly reduced the initial peak force and improved the specific energy absorption of the BHSS. Finally, the multi-objectives optimization based on response surface method and the non-dominated sorting genetic algorithm (NSGA-II) was employed to optimize the geometric parameters of the BHSS, aiming at the optimal configuration for better crashworthiness. Compared to the original design structure, the SEA of the optimized knee point structure was increased by 21.8% and the IPF was reduced by 72.6%. These findings provided valuable guidelines for the brain-coral-inspired design of multilayer sandwich structures with superior energy-absorbing performance.
轴向挤压下脑珊瑚启发多层夹层结构的耐撞性分析与优化
受脑珊瑚和海螵蛸的启发,本研究采用三维打印技术制造了一种基于希尔伯特空间填充曲线的新型生物启发多层夹层结构(命名为 BHSS)。通过准静态轴向挤压实验和有限元(FE)模拟,比较了 BHSS 的力学行为和变形过程。通过有限元模拟比较了不同层 BHSS 的能量吸收特性,结果表明 4 层 BHSS 具有更优越的耐撞性。然后,进行了参数研究,探讨层高梯度和壁厚梯度对 BHSS 吸能性能和变形模式的影响。结果表明,双梯度设计显著降低了初始峰值力,提高了 BHSS 的比能量吸收能力。最后,采用基于响应面法和非支配排序遗传算法(NSGA-II)的多目标优化方法对 BHSS 的几何参数进行了优化,以获得更好的防撞性能的最优配置。与原始设计结构相比,优化膝点结构的 SEA 增加了 21.8%,IPF 降低了 72.6%。这些发现为受脑珊瑚启发设计具有优异吸能性能的多层夹层结构提供了宝贵的指导。
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来源期刊
Journal of Sandwich Structures & Materials
Journal of Sandwich Structures & Materials 工程技术-材料科学:表征与测试
CiteScore
9.60
自引率
2.60%
发文量
49
审稿时长
7 months
期刊介绍: The Journal of Sandwich Structures and Materials is an international peer reviewed journal that provides a means of communication to fellow engineers and scientists by providing an archival record of developments in the science, technology, and professional practices of sandwich construction throughout the world. This journal is a member of the Committee on Publication Ethics (COPE).
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