Analysis of elastic wave propagation characteristics in isogrid structures

Abstract

In this study, the elastic wave propagation characteristics in isogrid structures are investigated by numerical analysis. By applying Bloch’s theorem as the boundary conditions to the unit cell of isogrid structure modeled by the finite element method (FEM), the dispersion surfaces of isogrid stuructures are calculated. As a result, no bandgaps are found in the frequency range of 0 kHz to 8 kHz. It is also found that while the second branch (dominated by in-plane transverse wave) and the third branch (dominated by longitudinal wave) propagate in an isotropic manner, the first branch (dominated by flexural wave) has anisotropic characteristics.