无源地震波衰减的分层大尺度弹性超材料

IF 1.5 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY EPJ Applied Metamaterials Pub Date : 2021-01-01 DOI:10.1051/EPJAM/2021009
M. Miniaci, N. Kherraz, C. Croënne, M. Mazzotti, M. Morvaridi, A. Gliozzi, M. Onorato, F. Bosia, N. Pugno
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引用次数: 12

摘要

近年来,大型弹性超材料因其作为地震波被动隔离结构的潜力而引起了科学界越来越大的兴趣。特别是,在其他隔离策略(如阻尼器)不可行的情况下,提出了所谓的“地震屏蔽体”来保护大面积区域。在这项工作中,我们研究了一种基于单位细胞分层设计的创新设计的可行性,即在不同尺度上重复具有自相似几何结构的结构。结果表明,层次结构的引入如何使单元格的概念在波长方面显示出减小的尺寸,同时在地震工程感兴趣的频率上保持相同或改进的隔离效率。这使得这种地震屏蔽的实际实现更加接近,其中低频操作和可接受的尺寸都是可行性的基本特征。
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Hierarchical large-scale elastic metamaterials for passive seismic wave mitigation
Large scale elastic metamaterials have recently attracted increasing interest in the scientific community for their potential as passive isolation structures for seismic waves. In particular, so-called “seismic shields” have been proposed for the protection of large areas where other isolation strategies (e.g. dampers) are not workable solutions. In this work, we investigate the feasibility of an innovative design based on hierarchical design of the unit cell, i.e. a structure with a self-similar geometry repeated at different scales. Results show how the introduction of hierarchy allows the conception of unit cells exhibiting reduced size with respect to the wavelength while maintaining the same or improved isolation efficiency at frequencies of interest for earthquake engineering. This allows to move closer to the practical realization of such seismic shields, where low-frequency operation and acceptable size are both essential characteristics for feasibility.
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来源期刊
EPJ Applied Metamaterials
EPJ Applied Metamaterials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
3.10
自引率
6.20%
发文量
16
审稿时长
8 weeks
期刊最新文献
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