Auxetic meta-disk for independent control of flexural and torsional waves. (1st April 2023)

• Record Type: Journal Article
• Authors: Hur, Jeong Min; Kim, Do-Nyun
• Is Part Of: International journal of mechanical sciences. Volume 243(2023)
• Publication Date: 2023-04-01
• Subjects: Auxetic pattern -- Metamaterial -- Bandgap -- Meta-disk -- Wave propagation; Mechanical engineering -- Periodicals; Génie mécanique -- Périodiques; Mechanical engineering; Maschinenbau; Mechanik; Zeitschrift; Periodicals; 621.05
• DOI: 10.1016/j.ijmecsci.2022.108050
• Languages: English
• ISSNs: 0020-7403

Abstract

Highlights: Auxetic meta-disk is proposed to separately control flexural/torsional wave propagation in pipes. The mode-dependent deformation of the auxetic pattern is the key mechanism for modulation of natural frequencies. The flexural/torsional bandgaps can be independently controlled in a broadband frequency range. An application of the meta-disk to an elastic wave mode filtering is demonstrated. The proposed design can be easily applicable without modifying the host structure. Abstract: Locally resonant elastic metamaterials have a unique characteristic of forming a low-frequency bandgap where wave propagation is inhibited. In this study, we present an auxetic meta-disk, a novel design of a local resonator capable of independent control of the flexural and torsional wave propagation in a pipe. The auxetic meta-disks are perforated with rationally designed auxetic patterns, whose mode-dependent deformation is the key mechanism enabling to manipulate the flexural and torsional natural frequencies of the meta-disks simultaneously. The capabilities of auxetic meta-disks in controlling wave propagation are thoroughly investigated using finite element analysis, and its applicability to elastic wave mode filtering is presented. Because of the simplicity in design and installation, the proposed concept is expected to be practical and applicable to various fields of vibration isolation or non-destructive inspection that require considering more than one vibration mode. Graphical abstract: Image, graphical abstract