Abstract
Monitoring fatigue crack propagation in industrial fields is very important. Crack can induce spontaneous abnormal magnetic signals in ferromagnetic material. During this research, tension–tension fatigue tests of center-cracked sheet specimens were carried out and the normal component of stray field signals, H p( y), on the surface of specimens were measured at different fatigue cycles. The results showed that there was a spontaneous abnormal peak which existed on the notch before loading, and reversed after loading. The Δ H p( y) value, i.e. peak-to-peak value of H p( y), increased with the fatigue crack propagation, and an approximate linear relationship was found between Δ H p( y) and crack length 2 a. The cause for this phenomenon was discussed, and the possibility of using Δ H p( y) to predict fatigue crack propagation life was analyzed. This method is simple and reliable for monitoring fatigue crack propagation in ferromagnetic materials.
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