磁気飽和ECTによる微小き裂の探傷と傷形状推定
概要
In eddy current testing (ECT), the permeability distribution of the steel materials affects inspection results and the signal-to-noise (S/N) ratio decreases. Therefore, magnetizing the materials is required to reduce the magnetic noise. In this research, the spring steel materials that have artificial microcracks were magnetized and inspected to evaluate detection performance of a developed ECT probe. It was confirmed that the probe is able to detect the 40 ?m depth crack with the S/N ratio of 3 or more. In addition, the permeability distribution around the crack in the magnetic saturation ECT was clarified with a finite element method (FEM) analysis.
