This paper presents a comprehensive review of the current state of knowledge of second
harmonic generation (SHG) measurements, a subset of nonlinear ultrasonic nondestructive …

The nondestructive assessment of the damage that occurs in components during service
plays a key role for condition monitoring and residual life estimation of in-service …

This research develops a robust experimental procedure to track the evolution of fatigue
damage in a nickel-base superalloy with the acoustic nonlinearity parameter, β⁠, and …

Dislocation dipole substructures formed during metal fatigue are shown to produce a
substantial distortion of ultrasonic waves propagating through the fatigued material. A model …

A reliable laser-based ultrasonic technique is developed to measure the second order
harmonic amplitude of a Rayleigh surface wave propagating in metallic specimens …

Nondestructive testing and evaluation (NDT&E) are commonly used in the industry for their
ability to identify damage and assess material conditions. Ultrasonic testing (UT) is one of …

Organized substructural arrangements of dislocations formed in wavy slip, face–centred–
cubic metals during cyclic stress–induced fatigue are shown analytically to engender a …

The objective of this research is to develop an accurate and reliable procedure to measure
the second order harmonic of a Lamb wave propagating in a metallic plate. There are two …

This letter reports on the experimental observation of a direct correlation between the
acoustic nonlinearity measured with Lamb waves and the level of plasticity in a metal …

This paper reports on a method that uses nonlinear Lamb waves to detect material
nonlinearity. Lamb waves are well suited for the interrogation of thin metallic layers which …