Torsional wave focusing in cylindrical structures with the conformal gradient-index phononic crystal lens

Okudan, Gorkem; Danawe, Hrishikesh; Ozevin, Didem; Tol, Şerife

doi:10.1063/5.0050295

Cited by 11 publications

(3 citation statements)

References 24 publications

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“…However, polarising a longer piezoelectric transducer is more difficult. Inspired by the performance of a shear-type piezoelectric wafer active sensor, Okudan et al [75] utilised d 35 piezoelectric actuators to excite the torsional guided wave T(0,1) in a pipe-like structure, which was [76].…”

Section: Piezoelectric Torsional Transducer Arraymentioning

confidence: 99%

A review of non-axisymmetric guided waves and their corresponding transducers for defect detection in circular tube structures

Fang

2023

Smart Mater. Struct.

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An axisymmetric guided wave mode is excited independently within a circular tube structure to reduce the complexity of signal interpretation through the prevention of unwanted wave polarisations and reflections. However, it is difficult to use the axisymmetric guided wave to determine the circumferential position and coverage of a defect within the circular tube structure. Non-axisymmetric guided waves can be used to mitigate the limitation of the axisymmetric guided wave through the adoption of a partially covered transducer design and analysis of the propagation characteristics. The partial excitation of non-axisymmetric guided waves can facilitate the arrangement of a transducer during defect detection. This paper reviews state-of-the-art research on non-axisymmetric guided waves for determining the axial positions, circumferential positions, and circumferential lengths of defects. First, the fundamental analysis of a specific non-axisymmetric guided wave mode based on the normal mode expansion method and beam directivity analysis method reveals that the propagation characteristics of the wave mode are closely related to the working principle and configuration of the corresponding transducer. Then, the advantages and disadvantages of the different types of transducers and transducer arrays for the excitation of non-axisymmetric guided waves are introduced and discussed. Finally, the current defect detection methods based on non-axisymmetric guided waves are discussed and summarised. This review can promote the application of non-axisymmetric guided waves in defect detection.

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Section: Piezoelectric Torsional Transducer Arraymentioning

confidence: 99%

A review of non-axisymmetric guided waves and their corresponding transducers for defect detection in circular tube structures

Fang

2023

Smart Mater. Struct.

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“…arrangement. In the past few decades, PnCs have come into the spotlight in the science community due to their properties of unorthodoxly controlling wave-energy flow in elastic realms, including the gradient refractive index [5], negative refraction [6], mode conversion [7], and collimation [8]. Inspired by the fact that ordinary structures do not implement these intriguing physical phenomena, PnCs have recently presented the feasibility of opening a new avenue in the development of new conceptual products in engineering fields [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Double piezoelectric defects in phononic crystals for ultrasonic transducers

Jo¹,

Lee²,

Yoon³

et al. 2023

J. Phys. D: Appl. Phys.

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Significant prior research has explored elastic wave-energy localization via a defect mode of a phononic crystal (PnC). The integration of defect-introduced PnCs and piezoelectric materials has paved the path for the development of new conceptual products for applications in energy harvesters, wave filters, and ultrasonic sensors. Recently, an attempt has been made to deviate from this paradigm and design an ultrasonic transducer that generates elastic waves. Unfortunately, the previous works have been limited to a single-defect situation. Therefore, as an advanced approach, this work aims to expand the PnC design space into double defects, which will make the ultrasonic transducer useful at several frequencies. As a first step, this study targets longitudinal wave generation. To predict the wave-generation performance, a previous analytical model that was built for energy-harvesting purposes under a single-defect situation is modified to be suitable for the present wave-generation purpose under a double-defect situation. Moreover, two parametric studies are executed to analyze how the output responses change based on changes to the input voltage setting and the spacing between the double defects. We hope that these ultrasonic transducers can be potentially applicable for nondestructive testing in structural health monitoring and ultrasonic imaging in medical science.

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“…For example, Okudan at al. (Okudan, Danawe, Ozevin, & Tol, 2021) presented periodic structure, consisting of cylindrical pillars, which focusing first mode of the torsional wave in certain point to increase the amplitude, which increases signal-to-noise ratio. Chen at al.…”

Section: Introductionmentioning

confidence: 99%

Influence of periodic structure with a different shape element on the torsional wave

I¹,

Lee²

2022

eJNDT

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Periodic structure is wildly used in metamaterial design in different fields. It has great potential in NDE and SHM fields due to different features, like focusing, bandgap, direction manipulation, and mode selection. First fundamental torsional mode T(0,1) can be focused by adding periodic structure based on phononic crystals and gradient index refraction. In the present study influence of the periodic structure with different element shape on torsional wave is discussed. Eigenfrequency analysis was performed for different configurations of the periodic structure by using the finite element method and floquet boundary condition. Dispersion curves for the torsional wave were obtained as an analysis result. Propagating wave creates a local resonance which leads to the bandgaps between modes and the first torsional mode T(0,1) becomes dispersive. The influence of the configuration on the dispersion curves is shown. Additionally mentioned that negative group velocity can be achieved.

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Torsional wave focusing in cylindrical structures with the conformal gradient-index phononic crystal lens

Cited by 11 publications

References 24 publications

A review of non-axisymmetric guided waves and their corresponding transducers for defect detection in circular tube structures

A review of non-axisymmetric guided waves and their corresponding transducers for defect detection in circular tube structures

Double piezoelectric defects in phononic crystals for ultrasonic transducers

Influence of periodic structure with a different shape element on the torsional wave

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