1. Nonlinear Lamb wave-mixing technique for micro-crack detection in plates.
- Author
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Jingpin, Jiao, Xiangji, Meng, Cunfu, He, and Bin, Wu
- Subjects
- *
LAMB waves , *MICROCRACKS , *STRUCTURAL plates , *NONLINEAR waves , *FINITE element method - Abstract
In engineering practice, failures due to fatigue cracks in metallic structures have always been difficult to predict. In our study, nonlinear Lamb wave-mixing was applied in the detection of micro-cracks in plates. The analysis of the nonlinear interaction of these waves with cracks of various lengths and widths was performed using finite-element simulations. The simulation results showed that the sideband at the sum frequency provide a sensitive means for micro-crack detection. Moreover, the sideband amplitudes show a monotonic increase with micro-crack length, but a decrease with micro-crack width. Experiments using Lamb wave-mixing were conducted on plates with fatigue cracks. The experimental results show that a proposed acoustic nonlinearity parameter related to the sideband at the sum frequency is sensitive to micro-cracks in plate, and is well correlated with the damage degree. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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