Stress dependence of ferromagnetic hysteresis loops for two grades of steel

Abstract Residual stress is an essential input into calculations of the remaining life of operational plant. However, many life predictions are inherently conservative because measurements of the absolute stress are unavailable. The magnetic properties of material are sensitive to stress, and in this paper, the magnetic properties (at maximum magnetisation, at remnance, and at the coercive field) of two grades of steel (Durehete 1055 and AS1548-7-46OR) under uni-axial stress are presented. The magnetic parameters are more sensitive to compressive stress than to tensile stress. A mathematical model using the Jiles–Atherton theory for ferromagnetic hysteresis is used to explain the trends in the experimental data. The ability of magnetic techniques to measure stress is demonstrated.

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