科研之友
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摘要
The residual magnetic field (RMF) of a ferromagnetic element is a value that can be affected by several physical effects. These are: the magneto-mechanical effect, the effect of magnetic field leakage caused by a discontinuity or a structural inhomogeneity of the material, and the processes of mutual interacting of magnetic fields with dislocations and their accumulation. The following paper presents the results of the RMF measurements performed on mechanically notched samples exposed to tensile loads. The distribution of the RMF was mapped for subsequent loads applied. There were substantial changes in the pattern of isolines and in all of the components of the RMF of the samples in comparison to the initial state. That indicates a high sensitivity of the RMF to any changes in stress. The results obtained were compared to the calculated maps of stresses and deformation. A correlation was found out between these values. Measurements of the RMF make it possible to determine the notch effect and a qualitative determination of the distribution of inner stresses.
- 出版日期2008-10
