SELF-EMITTING MAGNETIC SIGNALS BEHAVIOR OF FERROMAGNETIC MATERIAL DURING FATIGUE CRACK PROPAGATION UNDER LOAD-ON CONDITION
Cite this article:
. SELF-EMITTING MAGNETIC SIGNALS BEHAVIOR OF FERROMAGNETIC MATERIAL DURING FATIGUE CRACK PROPAGATION UNDER LOAD-ON CONDITION. Acta Metall Sin, 2011, 47(3): 257-262.
Abstract Variations of self-emitting magnetic signals during fatigue crack propagation of central crack testing specimen of 45CrNiMoVA steel was studied. The results showed that the initial abnormal magnetic peak occurred in all the measured lines, and there was a maximum peak-to-peak value in the center measured line before loading. However, the first abnormal magnetic peak occurred on the position of the precut notch after loading, while magnetic signals curve presented linear on the position without precut notch, at this time fatigue crack did not initiate. During fatigue crack propagation, the second abnormal magnetic peak occurred in the measured lines in turn. The peak-to-peak value of the second abnormal magnetic signals and the slope coefficient between peak-to-peak can be used to characterize fatigue crack propagation life dynamically. The behavior of self-emitting magnetic signals during fatigue crack propagation was analyzed on the basis of magnetic charge and effective magnetic field theory under loading condition.
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