Enabling the complete mode conversion of Lamb waves into shear horizontal waves via a resonance-based elastic metamaterial

摘要

Manipulating the conversion phenomena among different wave modes is of great interest within the physics and engineering communities. In this Letter, a resonant elastic metamaterial is elaborately designed to achieve complete conversion from Lamb modes (A_0 and S_0) into the fundamental shear horizontal (SH_0) mode. The key to achieving this interesting behavior resides in the design of a pillared perforated metamaterial, providing the strong coupling between the stub modes in shear resonant motion and the plate modes in the substrate medium. Both numerical modeling and experimental verification are conducted to validate the achievement of the mode conversion phenomenon.