Elastic metamaterial rod for mode filtering in ultrasonic applications

S.K. Sikundalapuram Ramesh; M. Chitnaduku Thippeswamy; P. Rajagopal; K. Balasubramaniam

Elastic metamaterial rod for mode filtering in ultrasonic applications

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Author(s): S.K. Sikundalapuram Ramesh¹ ; M. Chitnaduku Thippeswamy¹ ; P. Rajagopal¹ ; K. Balasubramaniam¹
- Affiliations: 1: Centre for Non-Destructive Evaluation, Indian Institute of Technology Madras , Chennai-600036 , India
Source: Volume 56, Issue 19, 17 September 2020, p. 1024 – 1027
DOI: 10.1049/el.2020.1576 , Print ISSN 0013-5194, Online ISSN 1350-911X

Received 25/05/2020, Published 30/06/2020

The proposed 1D elastic metamaterial rod finds application in non-destructive evaluation, as a filter in the transduction side, where only the torsional and flexural modes need to be generated by isolating longitudinal modes. In this Letter, this is achieved by obtaining a wide bandgap in low-frequency ultrasound regime. The novelty of the proposed design arises from the use of a high impedance mismatch between the materials selected for the rod. The proposed concept is demonstrated and verified with numerical simulations. The effectiveness of the proposed technique is confirmed by comparing the results obtained from the rod made of a single material.

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Elastic metamaterial rod for mode filtering in ultrasonic applications

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