주파수 변화에 따른 축대칭 관결함의 와전류탐상 수치해석

Numerical Analysis of Eddy Current Testing for Pipe with Axi-symmetric Defect According to Frequency Changes

This paper presents a numerical analysis of the eddy current testing for pipe with axi-symmetric defect according to frequency changes using the finite element method(FEM). The defects used in this analysis are inner and outer axi-symmetric type. In order to obtain the behaviors of the signals by changing the frequency, the defects with different depths are modeled and analyzed using FEM. It is important to choose proper frequency because of the effect of skin depth in eddy current testing. This paper describes signal characteristics of each defects as frequency is changed.