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An available analytical expression for irreversible variations of the remanent magnetization in an open-shaped ferromagnetic body resulting from mechanical loading is examined experimentally. The analysis was carried out using results of studies performed for chromium steels and Fe-Co alloys subjected to various heat treatments, as well as for R-Fe alloys.It is well known [1-5] that a ferri or ferromagnetic body characterized by remanent magnetization 1/ J and nonzero magnetostriction ( λ s ≠ 0) is demagnetized irreversibly during a deformation. In this case, the demagnetization value depends on applied external stresses σ and the number of loading-off-loading cycles (H-P).This phenomenon is the basis for the operation of magnetoelastic transducers for peak mechanical loads [6][7][8]. An open-shaped ferromagnetic body brought into the remanent magnetized state serves as a sensing element of such a transducer. Mechanical loading of the sensing element leads to an irreversible decrease in its magnetization. On the basis of this irreversible change in the magnetization, the load applied to the sensing element is determined.To improve the metrological properties of such transducers, the functional relationship between the irreversible decrease in the magnetization and the applied mechanical load need to be known.The aim of the presented work is to check experimentally, in a series of materials, an available analytical dependence of irreversible variations of the remanent magnetization of an open-shaped ferromagnetic body on applied mechanical stresses.The analysis was carried out using results of studies performed for chromium steels and Fe-Co alloys (Vicalloy) subjected to various heat treatments, as well as for R-Fe alloys [3,5,8].The investigation was performed using the following cylindrical samples: steel samples 5.5 mm in diameter and 15 mm in length, Vicalloy samples 6.0 mm in diameter and 14.7 mm in length, and samples of rare earth metal-containing alloys 10 mm in diameter and 31 mm in length. Measurements were carried out using the following scheme.The samples were magnetized to saturation along their length by an electromagnet and subsequently subjected to loading-off-loading using a test bed, which was designed on the basis of a tensile-testing machine. Then the magnetization of samples in the off-loaded state was determined.The magnetization was determined by a pulled-off coil method. The coercive force was measured by a vibrating-sample magnetometer. The magnetostriction was determined using bonded strain gages connected to a dc bridge circuit.The following expression, which relates the remanent magnetization of an open-shaped ferromagnetic body to the applied mechanical stress, was suggested in [7]:(1)where J r is the remanent magnetization of a sample before the loading, J is the magnetization of the sample subjected to loading and subsequent off-loading, σ is the absolute value of the mechanical stress, and β 1 is a coefficient. In this formula, β 1 is constant for a given material.To check the valid...
An available analytical expression for irreversible variations of the remanent magnetization in an open-shaped ferromagnetic body resulting from mechanical loading is examined experimentally. The analysis was carried out using results of studies performed for chromium steels and Fe-Co alloys subjected to various heat treatments, as well as for R-Fe alloys.It is well known [1-5] that a ferri or ferromagnetic body characterized by remanent magnetization 1/ J and nonzero magnetostriction ( λ s ≠ 0) is demagnetized irreversibly during a deformation. In this case, the demagnetization value depends on applied external stresses σ and the number of loading-off-loading cycles (H-P).This phenomenon is the basis for the operation of magnetoelastic transducers for peak mechanical loads [6][7][8]. An open-shaped ferromagnetic body brought into the remanent magnetized state serves as a sensing element of such a transducer. Mechanical loading of the sensing element leads to an irreversible decrease in its magnetization. On the basis of this irreversible change in the magnetization, the load applied to the sensing element is determined.To improve the metrological properties of such transducers, the functional relationship between the irreversible decrease in the magnetization and the applied mechanical load need to be known.The aim of the presented work is to check experimentally, in a series of materials, an available analytical dependence of irreversible variations of the remanent magnetization of an open-shaped ferromagnetic body on applied mechanical stresses.The analysis was carried out using results of studies performed for chromium steels and Fe-Co alloys (Vicalloy) subjected to various heat treatments, as well as for R-Fe alloys [3,5,8].The investigation was performed using the following cylindrical samples: steel samples 5.5 mm in diameter and 15 mm in length, Vicalloy samples 6.0 mm in diameter and 14.7 mm in length, and samples of rare earth metal-containing alloys 10 mm in diameter and 31 mm in length. Measurements were carried out using the following scheme.The samples were magnetized to saturation along their length by an electromagnet and subsequently subjected to loading-off-loading using a test bed, which was designed on the basis of a tensile-testing machine. Then the magnetization of samples in the off-loaded state was determined.The magnetization was determined by a pulled-off coil method. The coercive force was measured by a vibrating-sample magnetometer. The magnetostriction was determined using bonded strain gages connected to a dc bridge circuit.The following expression, which relates the remanent magnetization of an open-shaped ferromagnetic body to the applied mechanical stress, was suggested in [7]:(1)where J r is the remanent magnetization of a sample before the loading, J is the magnetization of the sample subjected to loading and subsequent off-loading, σ is the absolute value of the mechanical stress, and β 1 is a coefficient. In this formula, β 1 is constant for a given material.To check the valid...
Magnetoelastic tests of 30KH13 (30X13) steel were carried out under cyclic loadings. The article focuses on the property of magnetoelastic power relaxation of remanent magnetization. With the load amplitude increasing, complexes of power approximation coefficients reflect typical mechanical loads at various tempering temperatures.
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