Nonlinear Lamb waves for the detection of material nonlinearity

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Evaluation of fatigue damage using nonlinear guided waves (2009, methodology): “This study uses an improved version of a previously proposed experimental technique [9, 10] which is essentially the same as the one used in [12].”
Second harmonic generation at fatigue cracks by low-frequency Lamb waves: experimental and numerical studies (2018, background): “Nonlinear ultrasonic techniques detect the incipient damage based on nonlinear phenomena, such as higher harmonic generation [24], sub-harmonic generation [25], mixed frequency response [26,27] and nonlinear resonance [28].”
Acousto-ultrasonics-based fatigue damage characterization: Linear versus nonlinear signal features (2014, background): “(16) is defined for a one-dimensional medium, while for Lamb waves in plates, such an index can be achieved by multiplying a scaling factor [30], because a medium has an unchanged scaling factor at a given measurement point regardless of the occurrence of fatigue damage.”