Evaluation of fatigue damage using nonlinear guided waves

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Ultrasonic waves for materials evaluation in fatigue, thermal and corrosion damage: A review (2019, unknown): “So, to obtain the value of the non-linear ultrasonic coefficient 𝛽 is necessary to measure the absolute amplitude of the ultrasonic wave 𝐴 1 and 𝐴 2 [45] [46] [47].”
Review of Second Harmonic Generation Measurement Techniques for Material State Determination in Metals (2015, background): “uration at higher fatigue cycles was also seen with nonlinear Lamb waves in an Al-1100 alloy [84].”
Fatigue damage evaluation in A36 steel using nonlinear Rayleigh surface waves (2012, result): “This behavior is consistent with experimental results in other materials with a variety of loading conditions [1–10], and adds additional credence to the conclusion that the measured acoustic nonlinearity is plasticity driven.”
Simulation Methods for Guided Wave-Based Structural Health Monitoring: A Review (2015, background): “investigated the detection of plasticity and fatigue damage with Lamb waves [200, 201].”
Guided wave based structural health monitoring: A review (2016, methodology): “The Lamb wavedispersion plot with response spectrogram indicating same wave velocities for fundamental and second harmonics [272] is presented in figure 10(a) and the corresponding frequency domain response is shown in figure 10(b) for a low cycle fatigue aluminum specimen.”