作为轻质、承重和宽带电磁波吸收结构的多功能无缝元三明治复合材料

IF 10.3 1区 工程技术 Q1 ENGINEERING, MANUFACTURING
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引用次数: 0

摘要

由低密度有损材料组成的工程多孔几何结构因其可调的结构衰减而有望成为宽带吸收器,从而有选择性地操纵电磁波(EM)。然而,裸露的细胞结构需要机械加固和额外的封装。在这里,我们提出了一种多功能元三明治结构,它是由功能面板和基于介质损耗材料的八叉桁架几何结构组成的无缝集成组件,可实现轻质、承重和高性能的宽带电磁波吸收器。通过改变上下面板和八叉桁架核心的材料组合和多层结构,探索了 4-18 GHz 范围内的电磁响应,阐明了元三明治结构的吸收机制。多材料三维打印技术可将无缝元三明治复合材料的生产简化为一个步骤,从而实现了同时具有出色电磁波吸收和机械功能的设计。制成的复合材料采用薄型单层结构,由发射型上面板、介质损耗型内核和反射型下面板组成,在整个测量带宽内实现了 95.0% 的平均吸收率和宽带反射损耗(≤-10 dB)。此外,挠曲测试证实,与传统蜂窝结构相比,这种结构具有更出色的抗弯性能。通过将机械超材料和功能外壳合理地结合在一起,这种多材料元三明治设计将激发多功能性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Multifunctional seamless meta-sandwich composite as lightweight, load-bearing, and broadband-electromagnetic-wave-absorbing structure
Engineered porous geometries composed of low-density lossy materials are promising as broadband absorbers due to their tunable structural attenuation that can selectively manipulate electromagnetic (EM) waves. However, the exposed cellular architectures require mechanical reinforcement and additional packaging. Here, we present a multifunctional meta-sandwich structure as one seamlessly integrated component composed of functional faceplates and dielectric lossy material-based octet-truss geometries toward a lightweight, load-bearing, and high-performance broadband EM wave absorber. EM responses are explored in the 4–18 GHz range by varying material combinations and multilayers of the upper-lower faceplates and the octet-truss core, elucidating the absorbing mechanisms of meta-sandwich structures. Multi-material 3D printing that streamlines the production of the seamless meta-sandwich composite into a single step implements the devised design that simultaneously excel in EM wave absorption and mechanical functionalities. The fabricated composite in a thin, single-layer structure comprising a transmitting upper faceplate, a dielectric lossy core, and a reflecting lower faceplate, achieves an average absorption rate of 95.0 % and a broadband reflection loss (≤-10 dB) over the entire measured bandwidth. Furthermore, flexural testing confirms superior bending resistance compared to conventional honeycomb structures. The multi-materials meta-sandwich design will inspire versatile multifunctionalities enabled by rationally combining mechanical metamaterials and functional housing.
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来源期刊
Additive manufacturing
Additive manufacturing Materials Science-General Materials Science
CiteScore
19.80
自引率
12.70%
发文量
648
审稿时长
35 days
期刊介绍: Additive Manufacturing stands as a peer-reviewed journal dedicated to delivering high-quality research papers and reviews in the field of additive manufacturing, serving both academia and industry leaders. The journal's objective is to recognize the innovative essence of additive manufacturing and its diverse applications, providing a comprehensive overview of current developments and future prospects. The transformative potential of additive manufacturing technologies in product design and manufacturing is poised to disrupt traditional approaches. In response to this paradigm shift, a distinctive and comprehensive publication outlet was essential. Additive Manufacturing fulfills this need, offering a platform for engineers, materials scientists, and practitioners across academia and various industries to document and share innovations in these evolving technologies.
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