2020 年 28 巻 2 号 p. 63-68
The maximum magnetic flux leakage from a crack is obtained when the magnetic flux is distributed orthogonally towards the crack; thus, clear magnetic particle indications are formed, which enables accurate inspection of cracks via magnetic particle testing (MT). However, cracks may be overlooked in a complex 3D shape because a magnetizer often cannot be configured to the complex portion being inspected and the test object cannot be appropriately magnetized.
In this study, the MT with a rotating magnetic field was executed for an H-shaped test object replicating a complex mechanical part, and the flaw detection performance in its complex shape portions was evaluated. Additionally, distributions of rotating magnetic flux density in a test object were analyzed with the finite element method. The analytical results and the actual magnetic particle testing results were compared.
