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Influence of Impact on Electromagnetic Response of Three-Dimensional Angle-Interlock Metacomposites

Composites Communications(2022)SCI 2区SCI 3区

Tiangong Univ | Zhejiang Univ | Jiaxing Univ

Cited 11|Views23
Abstract
A radar absorbing structure named three dimensional angle-interlock metacomposites (3DAM) was proposed based on the metamaterial units formed by three dimensional angle-interlock structure and ferromagnetic microwire as the functional element. To investigate the electromagnetic damage tolerance of 3DAM and its electromagnetic response towards impact, a 10J impact was applied on the 3DAM, and three representative regions, including impact center, impact edge and no impact have been selected. From the perspectives of permittivity, S parameters and impedance matching, the electromagnetic response of 3DAM at different regions have been investigated. It has been found that 3DAM presented negative permittivity before and after impact under X band, and the resonance frequency can be adjusted by impact position as a result of the structural change of metamaterial units formed by ferromagnetic microwires. The permittivity shifted to positive with less influ-ence by impact under Ku band. It has been verified by micro-CT that the movement and fracture of ferromagnetic microwires induced by impact led to a dimensional change of metamaterial units; therefore, reconfiguration of metamaterial units dominated the electromagnetic response of 3DAM after impact, which is advantageous to maintain the absorption ability. The absorption mechanism for the 3DAM before and after impact has been explored by both simulations and equivalent RLC circuit analyses. It has been found that the reconfiguration of microwires caused by impact led to a circuit rearrangement, hence, the electromagnetic response and absorption keeps high efficiency after impact, exhibiting a high electromagnetic damage tolerance.
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Key words
Radar absorbing structure,Metacomposites,Impact,Absorption mechanism
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要点】:本文提出了一种三维角锁结构复合材料(3DAM),研究了其在受到冲击时电磁响应的变化及其电磁损伤容忍性,发现结构变化可调节谐振频率并保持高吸收效率。

方法】:通过三维角锁结构单元和铁磁微线构成3DAM,并使用S参数、介电常数和阻抗匹配等方法分析不同区域的电磁响应。

实验】:对3DAM施加10J的冲击力,选取冲击中心、边缘和无冲击区域进行分析,使用微CT验证了冲击导致的铁磁微线移动和断裂,以及由此引起的电磁响应变化。实验使用的数据集为3DAM在不同冲击位置下的电磁响应数据。