Wave Propagation in Chiral Stiffness Metamaterials
Xiao Yu, Lifeng Wang, Kun Wu, Yuqiang Gao
Abstract: The dynamic behavior of chiral stiffness metamaterials is studied in this work. The equivalent stiffness parameters of chiral structures with different characteristic angles are obtained by a finite element method. A periodic chain composed of chiral cells is equivalent to a coupled spring-mass chain, which is solved theoretically and numerically to validate wave mode conversion and splitting. Furthermore, a locally coupled resonant metamaterial chain based on different chiral structures and disks is established. The dual bandgap of a single oscillator is verified experimentally and by the finite element method. The special wave splitting phenomenon residing in a coupled resonance dispersion crossover is verified numerically. Therefore, chiral stiffness metamaterials have a reference value for the design of the particularity of wave propagation.
