Chunli Li

Analysis of Relationships Between Three-Dimensional Magnetic Memory Signals and Artificial Defects Under Tensile Load

This paper mainly discusses the relationships between three-dimensional magnetic memory signals and artificial defects under different load levels. The correlations between the defect signal characteristic parameters and applied stress were analyzed. The magnetic signals at the surface of FV520B steels were measured by a 3D magnetic sensor. It has been concluded that three-dimensional magnetic signals had different detection sensitivity to the defects in different directions, and the defects can be accurately recognized based on the distinctive signal features. Additionally, the peak value of the tangential component and the peak-to-peak value of the normal component (i.e., Bxp and Bzp-p) presented different characteristics in elastic and plastic deformation stages with the increase of applied stress. The amplitude changes of the tangential component and maximum gradient value of the normal component (i.e., ΔBx and KG) were capable of estimating the mechanical damage degree of ferromagnetic materials.