A review on additive manufacturing of wave controlling metamaterial.

Phononic crystal (PnCs) is one of the metamaterials focusing on the wave controls. The fabrication of this metamaterial is the key for its further industrial applications. Due to the advantage on the direct combination of computer-aided design, additive manufacturing (AM) is one of the most efficient manufacturing technologies for the fabrication of this wave controlling metamaterial. Here we reviewed the recent applications of AM on the fabrication of the wave-controlling metamaterials. The new features generated from the printing of the metallic parts like quick temperature changes in heating and cooling and re-melting and reheating were introduced. The theoretical and numerical developments on the printing of alloys were combined with the existing knowledge on metallurgy for the explanations of the changes of mechanical properties. The variations of mechanical properties, the residual distortions, and the property-oriented design of AM were introduced with the focus on the shift of band gap characteristics from the theoretical design in the wave-controlling metamaterials. The relationship between the process parameters and the structural performance of the wave-controlling metamaterials and the mechanical properties of the AM objects were mainly summarized. [ABSTRACT FROM AUTHOR]