Numerical simulation of nonlinear Lamb waves used in a thin plate for detecting buried micro-cracks

Compared with conventional linear ultrasonic inspection methods, which are sensitive only to severe defects, nonlinear ultrasonic inspection methods are better for revealing micro-cracks in thin plates. However, most nonlinear ultrasonic inspection methods have only been experimentally investigated...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2014-05, Vol.14 (5), p.8528-8546
Main Authors: Wan, Xiang, Zhang, Qing, Xu, Guanghua, Tse, Peter W
Format: Article
Language:English
Subjects:
Acoustics
amplitude of second harmonic
amplitude ratio
Computer simulation
contact acoustic nonlinearity effect
Cracks
Finite element analysis
Finite element method
Inspection
Lamb waves
Mathematical models
Mechanical engineering
Methods
micro-crack
Microcracks
nonlinear Lamb waves
Nonlinearity
Nuclear power plants
second harmonic
Sensors
Simulation
Thin plates
Ultrasonic testing
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Summary:Compared with conventional linear ultrasonic inspection methods, which are sensitive only to severe defects, nonlinear ultrasonic inspection methods are better for revealing micro-cracks in thin plates. However, most nonlinear ultrasonic inspection methods have only been experimentally investigated using bulk or Rayleigh waves. Numerical studies, especially numerical simulations of Lamb ultrasonic waves, have seldom been reported. In this paper, the interaction between nonlinear S0 mode Lamb waves and micro-cracks of various lengths and widths buried in a thin metallic plate was simulated using the finite element method (FEM). The numerical results indicate that after interacting with a micro-crack, a new wave-packet was generated in addition to the S0 mode wave-packet. The second harmonics of the S0 mode Lamb waves and the new wave-packet were caused by nonlinear acoustic effects at the micro-crack. An amplitude ratio indicator is thus proposed for the early detection of buried micro-cracks.
ISSN:1424-8220
1424-8220
DOI:10.3390/s140508528