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research-article

Asymmetric Lamb wave propagation and mode isolation in thin plate with spatiotemporal periodic stiffness

[+] Author and Article Information
Liuxian Zhao

50 Nanyang Ave Block N3.1 B3b-03 Singapore, 639798 Singapore lxzhao@ntu.edu.sg

Chang Quan Lai

50 Nanyang Ave Block N3, Room 02c-114 Singapore, 639798 Singapore cqlai@ntu.edu.sg

1Corresponding author.

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the Journal of Vibration and Acoustics. Manuscript received October 17, 2018; final manuscript received April 2, 2019; published online xx xx, xxxx. Assoc. Editor: Mahmoud Hussein.

ASME doi:10.1115/1.4043509 History: Received October 17, 2018; Accepted April 04, 2019

Abstract

The Lamb wave propagation through a thin plate with periodic spatiotemporal variation of material property was investigated through numerical simulations. It was found that regular oscillations of the Young's modulus in both space and time can lead to the creation of distinct band gaps for different modes of Lamb wave. Moreover, the dispersion relation for each mode was dependent on the direction of wave propagation (i.e. non-reciprocal). These results allow the Lamb wave modes to be reduced to a single mode travelling in a single direction for specific frequencies. This frequency range was observed to widen with increasing modulation amplitude of the Young's modulus but was not significantly altered by the modulation frequency. The insights derived from this study indicate that spatiotemporal control of material property can be used to effectively isolate Lamb wave modes and reduce reflections, leading to an improvement in the accuracy of the structural health monitoring of materials.

Copyright © 2019 by ASME
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