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RESEARCH PAPERS: Offshore Mechanics

Finite Element Modeling of Remote-Field Eddy Current Problems for the Nondestructive Testing of Metal Tube

[+] Author and Article Information
R. Palanisamy

Nondestructive Evaluation and Sensor Technology Group, The Timken Company, Canton, OH 44706

J. Offshore Mech. Arct. Eng 111(2), 101-108 (May 01, 1989) (8 pages) doi:10.1115/1.3257082 History: Received January 01, 1986; Revised October 05, 1988; Online October 30, 2009

Abstract

The remote-field eddy current effect refers to a low frequency eddy current nondestructive testing (NDT) phenomenon in tubular conductors (magnetic or nonmagnetic) in which the behavior of both amplitude and phase of induced magnetic field are in apparent contradiction to the conventional eddy current theory. Equal detection sensitivity across the wall thickness, linear relationship between the output signal phase-lag and the wall thickness, and absence of the lift-off problem are some of the attractive and contradicting features of this technique. Despite its early recognition and useful application in down-hole inspection of oil-well casing, no development of adequate scientific base that could explain this phenomenon has been reported. This paper describes modeling of this phenomenon using the finite element numerical analysis technique. Amplitude and phase of the sensor coil output have been predicted using this model for different axisymmetric test geometries, material properties, and excitation frequencies.

Copyright © 1989 by ASME
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