Applied Mathematics and Mechanics (English Edition) ›› 2023, Vol. 44 ›› Issue (4): 515-524.doi: https://doi.org/10.1007/s10483-023-2978-7

• 论文 •    下一篇

Elastic twisting metamaterial for perfect longitudinal-torsional wave mode conversion

Shengjie YAO, Yijun CHAI, Xiongwei YANG, Yueming LI   

  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
  • 收稿日期:2022-10-31 修回日期:2023-01-07 出版日期:2023-04-01 发布日期:2023-03-30
  • 通讯作者: Xiongwei YANG, E-mail: op.yangxw@xjtu.edu.cn
  • 基金资助:
    the National Natural Science Foundation of China (Nos. U2033208 and 52192633), the Natural Science Basic Research Plan in Shaanxi Province of China (No. 2021JQ006), the China Postdoctoral Science Foundation (No. 2020TQ0241), and the Innovative Scientific Program of China Nuclear Power Engineering Co., Ltd.

Elastic twisting metamaterial for perfect longitudinal-torsional wave mode conversion

Shengjie YAO, Yijun CHAI, Xiongwei YANG, Yueming LI   

  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
  • Received:2022-10-31 Revised:2023-01-07 Online:2023-04-01 Published:2023-03-30
  • Contact: Xiongwei YANG, E-mail: op.yangxw@xjtu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China (Nos. U2033208 and 52192633), the Natural Science Basic Research Plan in Shaanxi Province of China (No. 2021JQ006), the China Postdoctoral Science Foundation (No. 2020TQ0241), and 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 Fabry-Perot 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 L-T 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

Abstract: In this work, we design a twisting metamaterial for longitudinal-torsional (L-T) mode conversion in pipes through exploring the theory of perfect transmodal Fabry-Perot 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 L-T mode-converting metamaterial and its design methodology can be applied in various ultrasonic devices.

Key words: elastic wave, mode conversion, elastic metamaterial, ultrasonic device

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