Elastic twisting metamaterial for perfect longitudinal-torsional wave mode conversion  

作　　者：Shengjie YAO Yijun CHAI Xiongwei YANG Yueming LI 

机构地区：[1]State Key Laboratory for Strength and Vibration of Mechanical Structures,Shaanxi Key Laboratory of Environment and Control for Flight Vehicle,School of Aerospace,Xi’an Jiaotong University,Xi’an 710049,China

出　　处：《Applied Mathematics and Mechanics(English Edition)》2023年第4期515-524,共10页应用数学和力学（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Nos.U2033208,52192633);the Natural Science Basic Research Plan in Shaanxi Province of China(No.2021JQ-006);the China Postdoctoral Science Foundation(No.2020TQ0241);the Innovative Scientific Program of China Nuclear Power Engineering Co.,Ltd。

摘　　要：In this work,we design a twisting metamaterial for longitudinal-torsional(L-T)mode conversion in pipes through exploring the theory of perfect transmodal FabryPerot interference(TFPI).Assuming that the axial and radial motions in pipes can be decoupled,we find that the metamaterial can be designed in a rectangular coordinate system,which is much more convenient than that in a cylindrical system.Numerical calculation with detailed microstructures shows that an efficient L-T mode conversion can be obtained in pipes with different radii.In addition,we fabricate mode-converting microstructures on an aluminum pipe and conduct ultrasonic experiments,and the results are in good agreement with the numerical calculations.We expect that the proposed LT mode-converting metamaterial and its design methodology can be applied in various ultrasonic devices.

关 键 词：elastic wave mode conversion elastic metamaterial ultrasonic device 

分 类 号：O343[理学—固体力学]