Assessment of Magnetomechanical Symptoms Caused Near Yield Area for the Purpose of Material Stress Evaluation

The article discusses the assessment of magnetomechanical symptoms near the yield area in steel materials, focusing on the implications of these phenomena for material diagnostics. The research explores how localized plastic deformation, particularly the area where the formation of Lüders bands is possible, affects the magnetic properties of materials. Lüders bands, which occur during the transition from elastic to plastic deformation, could significantly influence magnetic domain structures, leading to detectable changes in magnetic signals, such as magnetic Barkhausen noise (MBN) and magnetic flux leakage (MFL). The study presents a novel approach using a custom measurement setup to analyze the magnetic field distribution and magnetic susceptibility (denoted as the S parameter) on the surface of steel samples under mechanical stress. The experimental results highlight how changes in the magnetic properties correlate with different deformation phases, emphasizing the importance of identifying key diagnostic signals that indicate early stages of material degradation. The findings have practical applications for monitoring the structural health of steel components in critical industries, enabling early detection of fatigue and plastic deformation before catastrophic failures occur. The research contributes valuable insights into the complex interactions between mechanical stresses and magnetic properties, supporting the development of more advanced diagnostic techniques.