Jin-Yeon Kim

TL;DR: In this article, the authors developed a robust experimental procedure to track the evolution of fatigue damage in a nickel-base superalloy with the acoustic nonlinearity parameter, β, and demonstrates its effectiveness by making repeatable measurements of β in multiple specimens, subjected to both high and low-cycle fatigue.

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.

TL;DR: In this article, the second order harmonic amplitude of a Rayleigh surface wave propagating in metallic specimens is measured using a laser-based ultrasonic technique, and the results show that there is a significant increase in the second-order harmonic amplitude at monotonic tensile loads above the material's yield stress.

TL;DR: In this article, a simple three-dimensional fracture-mechanical model has been developed to describe the initiation and growth of a fatigue crack emanating from a pit and in predicting the dependence of reduction of fatigue life on pit size.

TL;DR: In this paper, the second order harmonic of a Lamb wave propagating in a metallic plate is measured using a hybrid wedge generation and laser interferometric detection system, and the results show that the proposed procedure is able to characterize the inherent material nonlinearity of two different aluminum plates whose absolute nonlinearness parameters are known from longitudinal wave measurements.