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The Evaluation of Surface Crack in Paramagnetic Material by FEF Technique  

Kim, Hoon (Department of Automotive Engineering, Yosu National University)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.24, no.5, 2004 , pp. 532-537 More about this Journal
Abstract
FEF(Focused Electromagnetic Field) technique was newly developed that is based on the induction principle exciting electromagnetic field. The technique consists of an induction wire and a sensor for detecting electromagnetic field, and is applied in a non-contact mode. In this study, the technique was applied to the evaluation of EDM slits in some conductive materials - aluminum alloy, stainless steel and Inconel alloy. The voltage in the non-defect region is depended upon the measurement lift-off. The voltage signals on defects are measured with peak values, and the peak values changed with the depth of defects. The voltage distributions for all conductive materials are the same trend.
Keywords
electromagnetic field; FEF technique; non-contact mode; paramagnetic material; 2 dimensional surface defect; lift-off;
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