Chessboard Design of Pyramid-Core Sandwich Structures
* Presenting author
Lightweight materials and structures having high stiffness and strength but low density inspired by nature have been developed and applied since many years. Sandwich structures are one special kind of the most famous lightweight structures, which have been widely used in air crafts, automobiles and civil engineering. Despite the high stiffness-to-density ratio, it is still rather difficult to control acoustic or elastic waves in sandwich structures.Recently, investigations on wave propagation in periodic structures, known as the phononic crystals, have been received considerable attention. The most important characteristic of periodic structures is the so-called band-gap, the frequency range in which the propagation of elastic or acoustic waves is prohibited. The generating mechanisms of bandgaps are Bragg scattering and local resonances. Thus, numerous efforts have been made by using both mechanisms of the bandgaps to efficiently control the elastic wave propagation in the sandwich structures. In this study, we develop a chessboard design of pyramid-core sandwich structures which improves the wave attenuation property significantly but maintains the high stiffness-to-density ratio.