A review of elastic plate wave metamaterials

Yang, Shili; Zhong, Yuhao; Yan, Shiling; Zhang, Zidong; Li, Xin; Yu, Siyuan; Lu, Mengji

doi:10.1360/tb-2021-1310

Cited by 3 publications

(1 citation statement)

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“…As the understanding of the bandgap properties of PCs has deepened, researchers have begun to contemplate how these periodic structures can be employed to achieve physical control over signals [16,17]. At present, periodic metamaterials have been widely studied in the field of non-destructive testing (NDT) and structural health monitoring (SHM) [18]. Non-Destructive Testing (NDT) encompasses various methods, including visual inspection (VI), acoustic emission (AE), and ultrasonic testing (UT) [19].…”

Section: Introductionmentioning

confidence: 99%

Second Harmonic Modulation for Ultrasonic Signals Based on the Design of the Phononic Crystal Filter

Zhu,

Zhao,

Cao

2023

Sensors

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Nonlinear ultrasonic non-destructive testing (NDT) is a widely used method for detecting micro-damages in various materials and structures due to its high sensitivity and directional capability. However, the extraction and modulation of extremely weak nonlinear ultrasonic signals is quite a challenge in practical applications. Therefore, this paper focuses on the second harmonic modulation signal method in nonlinear ultrasonic NDT and proposes the design of the phononic crystal filter (PC filter) to achieve this filtering function. Through finite element simulations, it is demonstrated that the filtering frequency of the filter is influenced by the structural configuration, material wave speed, and geometric characteristics. Then, the design method for cubic PC filters is established. Furthermore, a time-domain finite element method is introduced to verify the filtering ability of the filter and further validate the rationality of this design approach.

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