Measurement of magnetic particle for quantitative evaluation in magnetic particle testing

Abstract

As magnetic particle testing (MT) detects microcracks using a simplified method, it is used for non-destructive inspection of ferromagnetic materials in various industrial fields. However, MT can provide only a rough distribution shape of a crack; a quantitative technique for evaluating the crack shape has not been established in conventional MT. In the present study, the relationship between the crack shape and the shape of the adhered magnetic particles was revealed by image measurements using a high-speed video camera. We developed a technique for quantitatively evaluating the crack shape from the results of magnetic particle indication in MT.