Monitoring the fatigue state of steel by evaluating the quasistatic and dynamic magnetic behavior

Abstract

For the evaluation of fatigue damage progression the application of quasistatic and dynamic magnetic measurements combined with the Preisach hysteresis model and the statistical loss theory is investigated. Throughout the fatigue lifetime hysteresis and excess magnetic behavior, both known to be sensitive to microstructural variations, are monitored. The magnetic evaluation results for fatigue tests executed on two steels depend on their initial microstructure and chemical composition. In addition the effect of low stress amplitude cyclic loading on the magnetic properties of electrical steel is investigated: after 1000cycles the excess losses are slightly decreased, while hysteresis properties stay invariant.

Magnetomechanical behavior for assessment of fatigue process in ferromagnetic steel

“…2,3 As a result, many attempts have been made to evaluate the destructive progress of fatigue using magnetic measurements. [4][5][6][7][8][9][10] In this research, the magnetization variation resulting from the cyclic loading is continuously monitored throughout the fatigue test. The goal is to investigate the relationship between the progressive degradation process of fatigue and the evolution of the magnetic field surrounding a ferromagnetic sample and explore the possibility to examine the fatigue process by exploiting the magnetomechanical effect.…”