仿生蜂窝结构与变梯度层的多目标优化

IF 3.5 3区材料科学 Q1 ENGINEERING, MECHANICAL

Journal of Sandwich Structures & Materials Pub Date : 2022-09-16 DOI:10.1177/10996362221127969

Xiaoqiang Niu, Fengxiang Xu, Z. Zou

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引用次数: 10

摘要

仿生和梯度设计在蜂窝结构中有很好的应用前景。提取了甲虫鞘翅的交点单元，增强了正六边形蜂窝结构，提出了几种仿生蜂窝结构。通过公式和实验对有限元建模方法进行了验证。在高原阶段，仿生蜂巢在中低速撞击下的受力和位移曲线呈现出两个突出的阶段，部分仿生蜂巢的泊松比为零或为负。抗撞性最好的仿生蜂窝材料INT_6的比能量吸收(SEA)。对INT_6进行了梯度设计，进一步提高了其耐撞性。采用多目标优化设计(MOD)，以同时提高SEA和降低峰值破碎力为目标，确定分级INT_6各层的最优参数。优化后分级INT_6的SEA比分级INT_6的SEA提高了142%，峰值破碎力比分级INT_6的峰值破碎力降低了25.4%。

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Bionic inspired honeycomb structures and multi-objective optimization for variable graded layers

Bionic and gradient designs offer promising applications in honeycomb structures. The intersection unit of the beetle elytra is extracted as to enhance regular hexagonal honeycomb (RHH), and several bionic honeycombs are proposed. Finite element (FE) modeling approach is verified through formulae and experiments. Curves of force and displacement of bionic honeycombs present two prominent stages under medium- and low-speed impacts in plateau stage, and several bionic honeycombs exhibit a zero or negative Poisson’s ratio. The specific energy absorption (SEA) of INT_6, whose crashworthiness is best in bionic honeycombs. A gradient design of INT_6 is implemented to further increase its crashworthiness. Multi-objective optimization design (MOD), which aims to simultaneously increase the SEA and reduce the peak crushing force, is adopted to determine the optimal parameters of each layer of graded INT_6. The SEA of the optimized graded INT_6 increase 142%, and its peak crushing force decrease by 25.4% compared with those of the INT_6.

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来源期刊

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

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).