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Pulsed magnetic apparatus for in situ stress measurement

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Abstract:

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.

Keywords: APPLIED STRESS; HYSTERESIS LOOP; MAGNETIC MEASUREMENT; MAGNETIC PROPERTIES

Document Type: Research Article

DOI: http://dx.doi.org/10.1784/insi.2011.53.9.478

Publication date: September 1, 2011

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