Journal ArticleDOI
Nonlinear Lamb wave-mixing technique for micro-crack detection in plates
TLDR
In this paper, nonlinear Lamb wave-mixing was applied in the detection of micro-cracks in plates, and the analysis of the nonlinear interaction of these waves with cracks of various lengths and widths was performed using finite-element simulations.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.read more
Citations
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Journal ArticleDOI
Damage detection techniques for wind turbine blades: A review
TL;DR: A comprehensive review of state-of-the-art damage detection techniques for WTBs, including most of those updated methods based on strain measurement, acoustic emission, ultrasound, vibration, thermography and machine vision are provided.
Journal ArticleDOI
Nonlinear ultrasonic detection for evaluating fatigue crack in metal plate
TL;DR: In this paper, a structural health monitoring method to evaluate micro-sized metal fatigue cracks is proposed. But, the method is limited to the case of metal materials and it is not suitable for other materials.
Journal ArticleDOI
Nonlinear Lamb wave mixing for assessing localized deformation during creep
TL;DR: In this paper, the authors demonstrate the use of nonlinear Lamb wave mixing technique to assess the localized deformation in modified 9Cr 1Mo steel during creep and reveal that this technique could be used to estimate the localized degradation of the steel much prior to its failure.
Journal ArticleDOI
Mixing of ultrasonic Lamb waves in thin plates with quadratic nonlinearity.
TL;DR: It is shown that an A0‐mode wave can be generated by a pair of S0 and A0 mode waves only when mixing condition is satisfied, and mixing wave signals are capable of locating the damage zone.
Journal ArticleDOI
Nonlinear guided wave mixing in pipes for detection of material nonlinearity
Carman Yeung,Ching-Tai Ng +1 more
TL;DR: In this paper, the nonlinear features generated due to mixing of torsional guided waves and material nonlinearity in pipes at low frequency range are investigated by 3D finite element (FE) models.
References
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Journal ArticleDOI
Nonlinear ultrasonic techniques for nondestructive assessment of micro damage in material: A review
TL;DR: In this paper, the authors reviewed the overall progress in nonlinear ultrasonic technique with the brief introduction of basic principle in the application of each nonlinear Ultrasonic phenomenon, including higher harmonic generation, subharmonic generation, nonlinear resonance, or mixed frequency response.
Journal ArticleDOI
The use of Lamb waves for the long range inspection of large structures
Peter Cawley,D. N. Alleyne +1 more
TL;DR: In this paper, the authors discuss the selection of an appropriate mode and its excitation and reception for the use of Lamb waves for the detection of delaminations in composite materials and corrosion in pipes.
Journal ArticleDOI
Review of Second Harmonic Generation Measurement Techniques for Material State Determination in Metals
TL;DR: In this article, the authors present a comprehensive review of the current state of knowledge of second harmonic generation (SHG) measurements, a subset of nonlinear ultrasonic non-destructive evaluation techniques.
Journal ArticleDOI
Modelling of nonlinear crack–wave interactions for damage detection based on ultrasound—A review
TL;DR: In this paper, a review of modeling approaches used for nonlinear crack-wave interactions is presented, including models of crack-induced elastic, thermo-elastic and dissipative nonlinearities.