Abstract
In this paper, a passive nondestructive evaluation method is proposed for inspection of damage in an austenitic stainless steel of SUS304 type based on the measurement of the magnetic field caused by the damage-induced magnetization. The detectability of the proposed method is investigated by introducing mechanical damages with tensile/fatigue test and measuring the magnetic field with the flux-gate sensors. The experimental results show that the plastic or fatigue damage is possible to be recognized from the measured signals of the natural magnetic field, which verified the feasibility to apply the proposed technique to the damage inspection.
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