Assessment of material damage in a nickel-base superalloy using nonlinear Rayleigh surface waves

By J. Herrmann, Jin-Yeon Kim, Laurence J. Jacobs, Jianmin Qu, J. W. Littles, M. Savage. 2006

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Fatigue damage evaluation in A36 steel using nonlinear Rayleigh surface waves (2012, background): “Starting from the displacement potentials that describe the longitudinal and shear wave components, and using the fact that the acoustic nonlinearity for the shear wave vanishes in an isotropic material, the expression for the acoustic nonlinearity parameter b in terms of measured normal surface dis”
Evaluation of fatigue damage using nonlinear guided waves (2009, background): “longitudinal [1, 2, 4] and Rayleigh [5] waves.”
Ultrasonic waves for materials evaluation in fatigue, thermal and corrosion damage: A review (2019, unknown): “Interactions between propagated elastic waves and medium characteristics were found in both cement [36] [37] and metal fields [38] [39].”
Review of Second Harmonic Generation Measurement Techniques for Material State Determination in Metals (2015, methodology): “[38] derived the acoustic nonlinearity parameter in terms of out-of-plane components of the first and second harmonic amplitude as:”