Deformation behavior and band gap switching function of 4D printed multi-stable metamaterials

Metamaterials/Phononic crystals are used to control the propagation of elastic waves/sound waves, and can be used in fields such as vibration isolation, noise reduction, stealth, focusing, and acoustic wave devices. The realization of real-time, flexible and active adjustable control of elastic waves by mechanical reconstruction of metamaterials is a current research hotspot Here, SMP metamaterials with mechanical reconstruction and self-recovery ability are proposed. Affected by the glass transition temperature of the material, the mechanical properties of the metamaterials are related to the geometric parameters of the lattice configuration and the external temperature. The metamaterials can adaptively switch mechanical properties and shapes without continuous external excitation of the physical field. The finite element method and experiments were used to analyze the deformation and self-recovery process of the metamaterials. The results show that the metamaterial can achieve mechanical programming and response recovery, and the bandgap of the metamaterial can be greatly adjusted by changing the external temperature. (C) 2021 Published by Elsevier Ltd.

Automated summary

This paper presents an SMP metamaterial with mechanical reconstruction and self-recovery capability, which can achieve real-time, flexible and actively adjustable control of elastic waves. The mechanical properties and shapes of the metamaterial can adaptively switch under external temperature changes, and the bandgap can be greatly adjusted by changing the external temperature.