Elastic metamaterials for guided waves: from fundamentals to applications

Abstract

Guided waves, elastic waves propagating through bounded structures, play a pivotal role in various applications, including ultrasonic non-destructive testing and structural health monitoring. Recently, elastic metamaterials artificially engineered to exhibit physical properties not typically seen in nature have emerged as a ground-breaking approach, heralding a new era in guided wave-based technologies. These metamaterials offer innovative solutions to overcome the inherent constraints of traditional guided wave-based technology. This paper comprehensively reviews elastic metamaterials from their fundamental principles to diverse applications, focusing on their transformative impact in guided wave manipulation.

Perfect circular polarization of elastic waves in solid media

“…In this paper, the concept of elastic metamaterials 15 , 16 is utilized to implement the proposed coupled resonance within an anisotropic medium. 3D micro-structuring of elastic metamaterials has provided overwhelming physical properties beyond common homogeneous materials, such as strong ultralight behavior 17 , 18 , auxetic behavior 19 , 20 , nonlinearity 21 , 22 , mechanical chirality 23 , 24 , and fluid-like behavior 25 , 26 .…”