微尺度手性晶格中波传播研究

To address the wave propagation problem in microscale chiral lattices, we studied the impact of the size effect on the wave propagation features. Based on the modified coupled stress theory, the equations of motion of the microscale Euler beam are established. Considering the size effect, the band structures of the microscale chiral lattices are calculated by applying the finite element method and the Bloch theorem. It is found that the lattice size has an important influence on the band structures and band gaps of microscale structures. The scale parameter introduced by the modified coupled stress theory increases the bending stiffness of the microscale Euler beam and the dispersion curve frequency. Additionally, the size effect on the directional features of the wave propagation is investigated by comparing the results in the isofrequency surfaces of the dispersion surfaces obtained by the present method and the classical theory.