Wave propagation analysis of one-dimensional CFRP lattice structure

Abstract

A composite lattice structure is a suitable candidate for light-weight aerospace structures. It consists of unidirectional carbon fiber reinforced plastic ribs in a periodic pattern, and exhibits excellent wave attenuation characteristics owing to its geometrical and material discontinuities. This is because periodic structures are capable of filtering waves in specific frequency bands. In this study, one-dimensional (1-D) wave propagation properties of a composite lattice structure are numerically evaluated using the finite element method (FEM), considering the periodicity of lattice structures with less computational resources. The numerical results are verified by comparison with transient responses using the full-scale FEM simulation. The analysis shows that the stop bands can be designed based on the geometries of the composite lattice structures. Finally, an example of a composite lattice structure with wide stop bands is suggested as a possible light-weight structure with superior wave attenuation properties.