Shock wave filtering of two-dimensional CFRP X-lattice structures: A numerical investigation

Abstract

A composite X-lattice structure, comprising corrugated carbon-fiber-reinforced plastic ribs in a periodic pattern, is considered a superior light-weight aerospace structure. It is expected to exhibit good wave attenuation properties owing to the frequency and spatial filtering characteristics of a two-dimensional periodic structure. Wave propagation analysis using the theory of a two-dimensional periodic structure and finite element method (FEM) was introduced to numerically evaluate the wave filtering properties with fewer computational resources. The results obtained using the periodicity were validated by comparing them with the frequency responses of the full-scale FEM simulation. The range of the wave filtering properties was presented by changing the geometrical properties of the lattice structure. An approach to design a composite lattice structure with broader and desirable wave filtering properties was proposed by combining several types of lattice structures with different wave filtering properties.