Abstract
The application of two magnetic nondestructive evaluation techniques is investigated to monitor material degradation caused by metal fatigue. First, a set of experimentally obtained major and minor quasistatic magnetization loops is analyzed within the framework of the moving Preisach formalism: the mean-field parameter k is found to increase with the number of stress cycles n and, moreover, the ratio dk∕dn is higher during the last 10% of the fatigue lifetime. Second, during the fatigue test a constant magnetic field is applied to the sample and the magnetization variation during each stress cycle due to the magnetomechanical effect is monitored: the peak-to-peak magnetization first increases, then stabilizes, and finally starts to decrease at 95% of the fatigue lifetime.
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