Main features of distributions of the magnetic flux leakage fields of defects different shapes

The features of topography of the magnetic fields of various defects are considered using the finite element method (FEM). The distinctive attributes of these defects are identified and some recommendations are given on determining different types of defects. It is shown that extremes of the normal component of the magnetic field created by defects are closely connected with an orientation and an angle of inclination of a defect in a plate. An approach for estimating this angle of inclination of surface defects and extended subsurface defects is proposed. © Published under licence by IOP Publishing Ltd.Ministry of Science and Higher Education of the Russian FederationThe research was carried out within the state assignment of Ministry of Science and Higher Education of the Russian Federation (theme «Diagnostics» No. АААА-А18-118020690196-3)

Highly effective system for excitation and reception of Lamb waves in ferromagnets

The paper presents the concept of a highly efficient system for excitation and reception of Lamb waves in ferromagnets. Methods for creating large polarizing fields allowing to increase the efficiency of generation and reception of Lamb waves in ferromagnets and the principles of unidirectional electromagnetic-acoustic transducers are proposed. The results obtained in this work can be used in the development of devices for non-destructive testing of the long ferromagnetic objects. © Published under licence by IOP Publishing Ltd