Influences of non-coaxial magnetic field on magneto-mechanical effect of ferromagnetic steel

Abstract

Magneto-mechanical effect describes a phenomenon that mechanical stress changes the magnetization of ferromagnetic materials with the involvement of an external magnetic field. Mechanical stress and the external magnetic field are two key factors influencing the magneto-mechanical effect of ferromagnetic materials. Researches on influences of stress and coaxial magnetic field on the magneto-mechanical effect of ferromagnetic materials are adequate. However, few researches have been conducted to investigate the impacts of non-coaxial magnetic field on the magneto-mechanical effect of ferromagnetic materials. In order to explore the influences of stress and non-coaxial magnetic field on the magneto-mechanical effect, series of mechanical stresses combining with different directions of magnetic fields were applied into a ferromagnetic carbon steel specimen in this paper. A structure-continuous specimen made of a ferromagnetic carbon steel was manufactured. A magnetic field stimulated by an electromagnet in turn applied into the specimen in four different directions to provide multidirectional non-coaxial magnetic fields. During each magnetizing process, series of elastic stresses were loaded into the specimen. After each loading process, the applied magnetic field was powered off, the specimen was removed from the loading machine, and the residual leakage magnetic field of the specimen was scanned. Finally, the distributions and intensities of the residual leakage magnetic fields resulted from different stresses and non-coaxial magnetic fields were compared, the influences of non-coaxial magnetic field on the magneto-mechanical effect of ferromagnetic carbon steel were concluded.