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Generation Mechanism of Nonlinear Rayleigh Surface Waves for Randomly Distributed Surface Micro-Cracks

1
College of Aerospace Engineering, Chongqing University, Chongqing 400044, China
2
Key Laboratory of Optoelectronic Technology and Systems of the Education Ministry of China, Chongqing University, Chongqing 400044, China
3
Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China
*
Authors to whom correspondence should be addressed.
Materials 2018, 11(4), 644; https://doi.org/10.3390/ma11040644
Received: 11 April 2018 / Revised: 19 April 2018 / Accepted: 19 April 2018 / Published: 23 April 2018
(This article belongs to the Section Structure Analysis and Characterization)
This paper investigates the propagation of Rayleigh surface waves in structures with randomly distributed surface micro-cracks using numerical simulations. The results revealed a significant ultrasonic nonlinear effect caused by the surface micro-cracks, which is mainly represented by a second harmonic with even more distinct third/quadruple harmonics. Based on statistical analysis from the numerous results of random micro-crack models, it is clearly found that the acoustic nonlinear parameter increases linearly with micro-crack density, the proportion of surface cracks, the size of micro-crack zone, and the excitation frequency. This study theoretically reveals that nonlinear Rayleigh surface waves are feasible for use in quantitatively identifying the physical characteristics of surface micro-cracks in structures. View Full-Text
Keywords: nonlinearity; Rayleigh surface waves; micro-cracks; numerical simulation nonlinearity; Rayleigh surface waves; micro-cracks; numerical simulation
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Ding, X.; Li, F.; Zhao, Y.; Xu, Y.; Hu, N.; Cao, P.; Deng, M. Generation Mechanism of Nonlinear Rayleigh Surface Waves for Randomly Distributed Surface Micro-Cracks. Materials 2018, 11, 644.

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