Publication: Publication Date: 1 August 2016Testing Method:

Publication: Publication Date: 1 August 2016Testing Method:

An apparatus was designed for measuring the internal stress in steel. Extrinsic hysteresis loops, magnetization curves, and surface field loops were measured at a pulsed magnetic field of 5 kA/m. It was found that the magnetic parameters change monotonically with compressive stress. The technical index shows that maximum magnetic flux density is an excellent evaluation parameter, reflecting stress with a precision of 1.6% and standard deviation of 3.185 × 10–4 T. In addition, the detection depth can reach 5 mm by employing this technique.

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