Anisotropic phononic crystal structure with low-frequency bandgap and heat flux manipulation

• 来源期刊: 中国科学:物理学 力学 天文学（英文版）
• 年，卷（期）: 2020,（2）
• 页码范围: 93-103
• 页数: 11页
• 语种: 英文

摘要

This study presents a two-dimensional phononic crystal with heat flux manipulation and wide bandgaps of out-of-plane modes within the low-frequency range.The anisotropic matrix made of spiral-multilayered materials with different thermal conductivities,and the coating layer inserted with metal are designed for heat flux manipulation.Rubber-coated metal cylinders are periodically embedded in the anisotropic matrix to obtain the low-frequency bandgaps of out-of-plane modes.Numerical simulation is carried out to validate the heat and elastic characteristics of the spiral-multilayered anisotropic structure and reveal the effects of the laying angle and temperature on the bandgaps.Subsequently,a spiral-multilayered plate with periodic structures is studied,which shows an obvious vibration attenuation in the frequency ranges of the bandgaps and a deflected heat flux from the initial propagation direction.In the experimental investigation,the multi-phase spiral-multilayered anisotropic plate is simplified to a single-phase anisotropic plate made of aluminum.The characteristics of this type of anisotropic phononic crystal structure may pave the way for the design of a new kind of thermo-acoustic metamaterial serving in combined thermal and acoustic environments.