Measurement and Evaluation of Magnetic Barkhausen Noise of Oriented Silicon Steel Sheet under Mechanical Stress

The magnetization and loss properties of magnetic material are closely related with the residual stress in the material, and the stress state in the material is hard to determine in advance. Magnetic Barkhausen noise (MBN) can be used to evaluate the microstructure changes, stress states, micro-damage defects and so on within a certain depth of ferromagnetic materials, and to realize the evaluation of fatigue, micro-cracks and other early performance degradation. In this paper, the measurement methods and detection platform of Barkhausen noise signal of oriented electrical silicon steel sheets under mechanical stresses are presented, and the Jiles-Atherton hysteresis model is combined with the Barkhausen noise evaluation model to propose a method to evaluate the mechanical stresses states of oriented electrical silicon steel sheets.