Nonlinear ultrasonic techniques for nondestructive assessment of micro damage in material: A review

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Detection of changes in cracked aluminium plate determinism by recurrence analysis (2012, background): “Similar classical features together with the analysis of slow dynamics are used in ultrasonic testing to detect fatigue cracks [6, 7].”
Review of Second Harmonic Generation Measurement Techniques for Material State Determination in Metals (2015, background): “This review is intended to extend previous reviews [27,28], and will specifically focus on second harmonic generation experiments and applications explored particularly within the recent years.”
Acousto-ultrasonics-based fatigue damage characterization: Linear versus nonlinear signal features (2014, background): “, nonlinear resonant ultrasound spectroscopy), dual frequency mixing [34], to name a few, as surveyed comprehensively elsewhere [35].”