Mechanical metamaterials for full-band mechanical wave shielding. (September 2020)

• Record Type: Journal Article
• Authors: Wu, Lingling; Wang, Yong; Zhai, Zirui; Yang, Yi; Krishnaraju, Deepakshyam; Lu, Junqiang; Wu, Fugen; Wang, Qianxuan; Jiang, Hanqing
• Is Part Of: Applied materials today. Volume 20(2020)
• Publication Date: 2020-09
• Subjects: Mechanical metamaterial -- Energy circulation -- Vibration isolation -- Shield -- Full band; Materials science -- Periodicals; Materials -- Research -- Periodicals; 620.1105
• DOI: 10.1016/j.apmt.2020.100671
• Languages: English
• ISSNs: 2352-9407

Abstract

Highlights: Here we present a mechanical metamaterial for perfect energy shielding through a new mechanism: solely circulating the energy between the metamaterial and the energy source, without passing to the to-be-protected object. A mechanical metamaterial was discovered based on this new mechanism and was successfully demonstrated to shield vibration energy. The knowledge from this metamaterial design can be applied to other physical fields and opens an unexplored frontier to design metamaterials (not just mechanical metamaterials) with intriguing dynamic performance. Abstract: The manipulation of the interactions between matter and waves is the central theme of metamaterials. The capability of energy shielding in a full frequency band has not yet been achieved. In this paper, a mechanical metamaterial for perfect energy shielding was discovered through a new mechanism by solely circulating energy between a metamaterial and an energy source. Unprecedented energy shielding effects are experimentally demonstrated in low and ultralow vibrational frequency ranges. Along with the widely explored mechanisms, namely, the "energy bypass" and "energy absorption" mechanisms, the "energy shield" mechanism and demonstrated mechanical metamaterial in this paper open a new direction for the design of metamaterials with unprecedented dynamic characteristics in various physical systems at different length scales. Graphical abstract: Image, graphical abstract