Due to their sensitivities to a specimen's microstructural evolution during processes
including heat treatment and plastic deformation, ultrasonic measurements of the acoustic …

This chapter gives readers fundamental understandings of various nonlinear acoustical
techniques. It briefly describes the nonlinear techniques that are popular today such as …

The operational life of components subjected to rolling contacts such as bearings and rail
wheels is limited by rolling contact fatigue (RCF). In RCF, materials undergo complex …

Nonlinear ultrasound (NLU) is a nondestructive evaluation method that is sensitive to
damage at length scales well below those detected by conventional ultrasonic methods …

Peri-ultrasound modeling which is based on nonlocal peridynamics is found and proven to
be effective for modeling nonlinear waves propagating and interacting with damages in …

The health state of concrete is deteriorating during its service. Nonlinear ultrasonic detection
based on the amplitude of the fundamental and the second harmonic is considered to be a …

The nonlinearity parameter is a powerful tool for nondestructive evaluation, as it provides a
measure of the state of damage of structural components. When carrying out nonlinearity …

Ultrasonic is one of the well-known methods for surface roughness measurement, but small
roughness will only lead to a subtle variation of transmission or reflection. To explore …

In this paper, a vibration-based damage detection method was employed to assess a hollow-
type prestressed concrete (BS12) girder in two different states using its dynamic …

The pulse-echo method is desirable in practice because it enables single-sided
measurement of the absolute nonlinear parameter (β), allowing quantitative characterisation …