Mechanical metamaterials for wave-based SHM and vibration isolation

In this chapter, a surface-bonded mechanical metamaterial (MMM) array is first designed to focus ultrasonic Lamb waves and increase signal-to-noise ratio for improved damage detection ability in an aluminum plate. Then, an attachable MMM is proposed based on kirigami technique for the directional flexural wave propagation and the attachable elastic hyperlens which offers superresolution possibility for small damage detection. Finally, a chiral-lattice-based MMM beam with multiple local resonators is numerically and experimentally studied for the broadband vibration suppression, which demonstrates the great potential of MMM in low-frequency vibration control of lightweight engineering structures.