In this paper, the possibility of applying the damage induced magnetic fields to the detection of mechanical damages in austenitic stainless steel is investigated by measuring magnetic fields induced by plastic and fatigue damages and reconstructing the magnetic charges distribution in the material. Mechanical damages are introduced to test-pieces of SUS304 stainless steel at first through a tensile and a zero tension fatigue testing. The magnetic field over the planar surface of the test-piece was measured with the use of advanced flux-gate sensors. Finally, the distribution of the magnetic charges, which is considered to be correlated to the status of mechanical damages. was reconstructed from the measured magnetic field by applying a deterministic algorithm. The reconstructed distribution of the magnetic charges agrees with that observed with the magnetic colloidal method, which gives a strong Support to the inspection method using magnetic field measurement.
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