Quantitative analysis of subsurface structure cracking using pulsed eddy current nondestructive testing

Abstract

This paper presents a three-dimensional finite element method for the nondestructive evaluation of forward problems utilizing the pulsed eddy current technique. The method visualizes and maps the distribution of responses resulting from the interaction between eddy currents and defects, facilitating defect characterization. The study elaborates on the defect characterization process using the pulsed eddy current technique, which encompasses both numerical and experimental analyses. Initially, the variation in pulse width of the pulsed eddy current technique is discussed, along with its effectiveness. Subsequently, the investigation into the application of pulsed eddy current testing for defects is conducted through the mapping of magnetic field distributions, implemented via time-stepping three-dimensional finite element modelling, with features extracted from the mapping for the purpose of defect characterization.