Finite element analysis of laser-generated Rayleigh wave for sizing subsurface crack in frequency domain

Wang, Chuanyong; Kong, Yi; Wang, Wen; Chen, Zhanfeng; Chen, Jian; Zhu, Wu-Le; Ju, Bing‐Feng

doi:10.1016/j.ijleo.2022.169145

Cited by 7 publications

(1 citation statement)

References 19 publications

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“…Recently, the laser ultrasonic technique (LUT) has been widely exploited for the detection and evaluation of various types of structural damage [21][22][23][24][25][26], due to its superior merits such as the noncontact excitation and wideband reception of ultrasonic waves, high sensitivity to damage and spatial resolution, accessibility to harsh environments and complexed structures. According to numerical and experimental results, multiple types of ultrasonic waves can be generated by a pulsed laser beam, including the skimming longitudinal wave, body longitudinal wave, shear wave, and Rayleigh wave.…”

Section: Introductionmentioning

confidence: 99%

Frequency-dependent Scattering of Wideband Laser-generated Rayleigh Waves for Vertical Surface Crack Characterization

Su²,

Yang³

et al. 2023

Smart Mater. Struct.

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Wideband laser-generated Rayleigh waves have been extensively exploited for surface crack characterization, most of which, nonetheless, are of a nature of either numerical simulation or experimental observation. Earlier, an elastodynamic reciprocity theorem-based theoretical model was proposed by the authors [1, 2], aimed at scrutinizing the interaction of narrowband Rayleigh-Lamb waves with a surface or subsurface crack. In this study, the model is expanded to a wideband scenario to analytically explore the interaction of a wideband laser-generated Rayleigh wave with a surface crack, as well as the resultant crack-scattered Rayleigh wavefield. First, under the narrowband scenario, a dimensionless parameter is formulated based on the closed-form solution to the magnitude of the narrowband scattered Rayleigh wavefield, revealing that the scattering effect of a surface crack on the Rayleigh waves is frequency-dependent and there exists a characteristic frequency, at which the crack-scattered Rayleigh wavefield manifests the strongest intensity. Similarly, under the wideband scenario, such dependence can be calibrated by a spectral damage indicator (SDI), which facilitates the evaluation of the severity of the surface crack using the wideband laser-generated Rayleigh wave. Proof-of-concept simulation is performed to verify the model. Quantitative agreement between the analytical and numerical results validates the accuracy of the proposed model and SDI. Experiment is also conducted to demonstrate the effectiveness of the frequency-dependent scattering of wideband laser-generated Rayleigh waves for vertical surface crack characterization.

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