CHANGES OF FERROMAGNETIC PARAMETERS DURING CYCLIC STRESSING

Changes of ferromagnetic properties of low carbon steel during cyclic stressing are studied. Two kinds of experiments are carried out: a) me asurements of magnetic hysteresis loops in the conditions of very slow stressing (coercive force H(c), remanent magnetic induction B(r), sat urated magnetic induction B(s), and hysteresis losses P(dis) are measu red), b) measurements of changes of remanent magnetic field inside the loaded specimen. The obtained results show that there are two differe nt mechanisms playing a role during the loading of a ferromagnetic mat erial: the elastic deformation of the crystal lattice that causes a mo notonic change of all the ferromagnetic properties and the plastic def ormation connected with a motion of dislocations that destroy eventual ly the magnetic structure of the metal: changes of ferromagnetic prope rties are not monotonic there and display a certain ''hysteresis''.