Article Article
Stress Measurement Apparatus Based on Pulsed Magnetic Field

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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