Highly stretchable radar absorber based on kirigami metastructures with tunable electromagnetic properties

IF 3.8 2区工程技术 Q1 ENGINEERING, MECHANICAL

Acta Mechanica Sinica Pub Date : 2024-12-16 DOI:10.1007/s10409-024-24363-x

Weimin Ding (, ), Zhong Zhang (, ), Shengyu Duan (, ), Zeang Zhao (, ), Hongshuai Lei (, )

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Abstract

The demand for lightweight and multifunctional surface structure in high-end equipment is steadily growing. The harmonization between flexibility and electromagnetic tunability has become a significant subject for stealth morphing aircraft. This paper presents a microwave absorbing structure based on the kirigami configuration, aiming at improving the conformality with the negative Poisson’s ratio characteristic and expanding the radar stealth range with tunability. A precise electromagnetic reflectivity model of the impedance surface was established by the inversion method, and an integrated optimization algorithm was employed to optimize the structural parameters based on numerical analysis. Specimens composed of thermoplastic polyurethane elastic colloids and resistive materials were prepared to assess the in-plane mechanical tensile and electromagnetic absorption performances through experimental methods. The results indicate that the original absorption band spans 6.2–11.1 GHz, shifts to 8–18 GHz with stretching at a panel rotation angle of 16°, and remains nearly constant for further stretching. The specimens adhere to complex curved surfaces well in experiments and maintain the electromagnetic absorption performance compared with flat surfaces. This research offers a valuable reference for designing electromagnetic stealth structures that are highly stretchable and adjustable.

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具有可调谐电磁特性的基里伽米元结构的高伸缩雷达吸收体

高端装备对轻量化、多功能表面结构的需求正在稳步增长。柔性与电磁可调性的协调已成为隐身变形飞机研究的重要课题。本文提出了一种基于基里伽米结构的微波吸收结构，旨在提高其与负泊松比特性的一致性，扩大雷达的可调性隐身范围。采用反演方法建立了精确的阻抗面电磁反射率模型，并在数值分析的基础上采用集成优化算法对结构参数进行优化。制备由热塑性聚氨酯弹性胶体和电阻材料组成的试样，通过实验方法评估其面内力学拉伸和电磁吸收性能。结果表明：原吸收波段跨越6.2 ~ 11.1 GHz，当面板旋转角度为16°时，拉伸后的吸收波段移至8 ~ 18 GHz，拉伸后吸收波段基本保持不变。实验结果表明，与平面相比，试样在复杂曲面上粘附良好，保持了电磁吸收性能。该研究为设计高伸缩可调的电磁隐身结构提供了有价值的参考。

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来源期刊

Acta Mechanica Sinica 物理-工程：机械

CiteScore

5.60

自引率

20.00%

发文量

1807

审稿时长

4 months

期刊介绍： Acta Mechanica Sinica, sponsored by the Chinese Society of Theoretical and Applied Mechanics, promotes scientific exchanges and collaboration among Chinese scientists in China and abroad. It features high quality, original papers in all aspects of mechanics and mechanical sciences. Not only does the journal explore the classical subdivisions of theoretical and applied mechanics such as solid and fluid mechanics, it also explores recently emerging areas such as biomechanics and nanomechanics. In addition, the journal investigates analytical, computational, and experimental progresses in all areas of mechanics. Lastly, it encourages research in interdisciplinary subjects, serving as a bridge between mechanics and other branches of engineering and the sciences. In addition to research papers, Acta Mechanica Sinica publishes reviews, notes, experimental techniques, scientific events, and other special topics of interest. Related subjects » Classical Continuum Physics - Computational Intelligence and Complexity - Mechanics