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Pulsed magnetic apparatus for in situ stress measurement

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A pulsed electromagnetic apparatus has been designed and fabricated for the non-destructive evaluation of stress concentration in ferromagnetic material. The apparatus consists of a sensor, a pulsed field generator and a data acquisition system, which is developed in the LabView environment using a data acquisition card. The apparatus has been applied successfully to measure the hysteresis loops and magnetisation curves of Q235 steel under various fixed compressive stresses. The presented measurement for magnetically-open samples showed a good repeatability by locally magnetising the samples to saturation. The magnetic properties derived from the loops and curves are sensitive to applied stress. Remanence B r is more accurate and suitable for characterising the stress in a material.
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Keywords: APPLIED STRESS; HYSTERESIS LOOP; MAGNETIC MEASUREMENT; MAGNETIC PROPERTIES

Document Type: Research Article

Publication date: 2011-09-01

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