Evaluation of inclined angle and depth of 2-dimensional surface crack using induced current focusing potential drop (ICFPD) technique

In the life management and safety evaluation of constructs base on a fracture mechanics, the size of defect is the very important parameter. ICFPD technique has been newly developed for the purpose of the detection and sizing of defects that are existing in not only solace but also inside and interior of structural components. The principle of this technique is to induce a focusing current at an explorating region by a straight induction wire flowing an alternating current (AC) that is a constant ampere and frequency. The potential distributed on the surface of metallic material is measured by potential pick-up pins that are settled on the probe. In this paper, this new NDI technique (ICFPD) was applied to the evaluation of inclined angle and depth of a 2-dimensional surface cracks in plate specimens. The results of this present study show that inclined surface cracks are distinguished with the distribution of potential drop and the inclined angle and depth of cracks can be estimated with the normalized potential drops which are each estimating parameter.