3D EXPERIMENTAL DATA ANALYSIS OF DIRECT AND INVERSE PROBLEM USING MULTIFREQUENCY AND EMAT APPROACH FOR CRACK DETECTION IN PLATE STRUCTURE

Abstract

The analysis of information, resulting from eddy currents nondestructive testing method proves very interesting, for the detection and identification of defects in many different industrial structures. We review in this paper, a three dimensional numerical approach based on AV-A formulation in order to determine interaction of induced eddy currents in the metal test specimen with flaws, and the coupling of these interaction effects with the moving test probe. In this paper, experimental and theoretical results are illustrated of three dimensional planar crack defect modeling, located in Benchmark metal plate structure by analyzing change in impedance of an absolute coil probe using multifrequency and electromagnetic acoustic transducer (EMAT) technique. An evaluation material characterization using neural network optimization technique is done