Dual-functional metamaterial with vibration isolation and heat flux guiding

Metamaterials can provide many engineering applications such as vibration attenuation and heat flux cloaking. However, the problems of isolating elastic waves and directing heat flux via a metamaterial device have not been resolved completely yet. In this paper, a dual-functional metamaterial, with cylindrical stub periodically attached on the multilayered plate, is initially designed and investigated numerically and experimentally. Numerical results demonstrate that the elastic wave band gaps can be opened and tuned effectively with the evolution of the rotation angle of the matrix plate. Furthermore, the path of heat flux can be controlled differently when the laminated plate is rotated to various extents. On this basis, a metamaterial plate with finite size is designed and fabricated by assembling unit cells with different orientation angles together for experimental verification. Vibration transmission measured by the corresponding experiment matches well with the band gap predicted by the band structure. Also, the heat flux is found to be guided desirably by comparing the temperature profile captured by the infrared camera with that of the simulation. Even though the fabrication of the specimen is restricted by the materials and the machining process, the dual-functional metamaterial proposed in this study paves a good way to freely engineer the multi-physics fields in integrated metamaterial device.

https://doi.org/10.1016/j.jsv.2019.115122