Elastic Metamaterials and Their Applications to Wave Control

Abstract

Wave property of materials is intimately related to their microstructures. By carefully designing the microstructure, different wave functions not available for traditional materials can be envisaged. In this talk, I will demonstrated through three examples the elastic wave control by the design of elastic metamaterials. The first is elastic negative refraction by designing an elastic metamaterial with both negative effective mass and modulus. The second example focuses on elastic wave filtering, we show that solids with only single polarization mode (either transverse wave or longitudinal wave) can be designed with pentamode materials. Finally I will explain the principle to make an asymmetric metamaterials which breaks the property of symmetric stress, and apply it to design elastic wave cloak. These results demonstrate a great capacity of elastic wave tailoring by elastic metamaterials and will surely find engineering applications in the near future.