The Experts below are selected from a list of 10512 Experts worldwide ranked by ideXlab platform
R Schafer - One of the best experts on this subject based on the ideXlab platform.
-
effect of applied tensile stress on the Hysteresis Curve and magnetic domain structure of grain oriented transverse fe 3 si steel
Journal of Magnetism and Magnetic Materials, 2015Co-Authors: O Perevertov, J Thielsch, R SchaferAbstract:Abstract The effect of an elastic applied tensile stress on the quasistatic Hysteresis Curve and domain structure in conventional (110) [001] Fe-3%Si steel, cut transversely to the rolling direction, is studied. The magnetic domains and magnetization processes were observed by longitudinal Kerr microscopy at different levels of stress. It is shown that above 8 MPa the bulk Hysteresis loop can be described with a good accuracy by the action of an effective field, which is the product of the stress and a function of magnetization. Domain observation reveals that the reasons for the effective field are demagnetizing fields due to the disappearance of supplementary domains at low applied field and the formation of different domain systems in different grains at low and moderate fields. The latter are caused by differences in grain sensitivity to stress depending on the degree of misorientation and grain boundary orientation. A decrease of the effective field above 1 T is connected with a transformation of all grains into the same domain system – the column pattern. The Hysteresis loop behavior is qualitatively the same as for strips cut in rolling direction and for non-oriented strips.
-
influence of applied tensile stress on the Hysteresis Curve and magnetic domain structure of grain oriented fe 3 si steel
Journal of Physics D, 2014Co-Authors: O Perevertov, R SchaferAbstract:The influence of applied tensile stress on the Hysteresis Curve and domain structure in conventional (1 1 0)[0 0 1] Fe–3%Si steel, cut parallel to the rolling direction, is studied on samples with different grain sizes. Quasistatic Hysteresis loops under tensile stresses up to 70 MPa were measured. The magnetic domains and magnetization processes were observed by longitudinal Kerr microscopy at different levels of stress. It is shown that for stresses exceeding 5–10 MPa the bulk Hysteresis loop can be described with good accuracy by the action of an effective field, which is the product of a function of stress and a function of magnetization. The function of stress is approximately linear with a slope of one. Except for the sample with the smallest grains, the function of magnetization is linear in the magnetization range ±1.2–1.5 T, i.e. it has a typical demagnetizing field shape. Domain observation reveals that the effective field is caused by the demagnetizing fields occurring at grain boundaries and at the sheet surface due to the removal of closure domains transverse to the rolling direction by the tensile stress. The closure structure reappears at higher fields. Another indirect indication of demagnetizing fields is the fact that the Hysteresis losses drop continuously with stress and changes in the coercive force are small. The effective field of the sample with the smallest grains increases most nonlinearly with stress similar to the behaviour obtained for non-oriented material.
-
influence of applied compressive stress on the Hysteresis Curves and magnetic domain structure of grain oriented transverse fe 3 si steel
Journal of Physics D, 2012Co-Authors: O Perevertov, R SchaferAbstract:The influence of an applied compressive stress on the Hysteresis Curve and domain structure in conventional (1?1?0) [0?0?1] Fe?3%Si steel cut transverse to the rolling direction is studied. Quasistatic Hysteresis loops under compressive stress up to 75?MPa were measured. The magnetic domains and magnetization processes were observed by longitudinal Kerr microscopy at different levels of stress. It is shown that the bulk Hysteresis loop can be described with a good accuracy by the action of an effective field, which is the product of the stress and a function of magnetization. Domain observations have shown that the reasons for the effective field are demagnetizing fields due to the disappearance of supplementary domains along [0?1?0] and [1?0?0] at low fields and different domain systems in different grains at moderate fields. The latter are caused by differences in grain sensitivity to stress depending on the degree of misorientation. A decrease in the effective field above 1?T is connected with a transformation of all grains into the same domain system?the column pattern.
Fernando Jose Gomes Landgraf - One of the best experts on this subject based on the ideXlab platform.
-
excess loss localization on the Hysteresis Curve
IEEE Transactions on Magnetics, 2014Co-Authors: Adriano Alex De Almeida, Fernando Jose Gomes Landgraf, Laura Spinelli Pinheiro Perassa, D Rodrigues, Thomas Seiji Pascoto Nishikawa, Sebastiao Da Costa Paolinelli, Ramon Valls MartinsAbstract:Two alloys of nonoriented electrical steel, with 2.45 and 3.3%Si, respectively, had their magnetic properties characterized in an Epstein frame. Hysteresis Curves for total, quasi-static, and parasitic losses were plotted and overlapped to identify the region where the anomalous loss happens. It was observed that most anomalous loss is from the domain wall movement's region and a smaller contribution from nucleation and annihilation regions.
-
anomalous loss Hysteresis loop
Materials Research-ibero-american Journal of Materials, 2014Co-Authors: Adriano Alex De Almeida, Laura Spinelli Pinheiro Perassa, Daniel Rodriguesjr, J Leicht, Fernando Jose Gomes LandgrafAbstract:This paper discusses the anomalous loss behavior in two electrical steels types. Starting from a non oriented electrical steel coil, three groups of samples with different grain sizes were produced. Grain oriented steel samples were produced from a commercially available material. The experimental procedure was performed by means of magnetic properties measurements using an Epstein frame. A procedure to draw the Hysteresis Curve of the anomalous loss is proposed. The results reported that anomalous loss has a different behavior when the two electrical steel types are compared. In non oriented steels anomalous loss is concentrated at the low induction region. In grain oriented steels, a remarkable participation of high induction region is observed.
-
modeling of sharp change in magnetic Hysteresis behavior of electrical steel at small plastic deformation
Journal of Applied Physics, 2005Co-Authors: M J Sablik, S Rios, Fernando Jose Gomes Landgraf, T Yonamine, M F De CamposAbstract:In 2.2% Si electrical steel, the magnetic Hysteresis behavior is sharply sheared by a rather small plastic deformation (0.5%). A modification to the Jiles–Atherton Hysteresis model makes it possible to model magnetic effects of plastic deformation. In this paper, with this model, it is shown how a narrow Hysteresis with an almost steplike Hysteresis Curve for an undeformed specimen is sharply sheared by plastic deformation. Computed coercivity and Hysteresis loss show a sharp step to higher values at small strain due to an n=1∕2 power law dependence on residual strain. The step is seen experimentally.
-
effect of grain size deformation aging and anisotropy on Hysteresis loss of electrical steels
Journal of Magnetism and Magnetic Materials, 2000Co-Authors: Fernando Jose Gomes Landgraf, M Emura, Julio C Teixeira, M F De CamposAbstract:The investigation of the effect of cold deformation, anisotropy, aging and grain size on the shape of the Hysteresis Curve of non-oriented electrical steels shows that most of the Hysteresis energy is dissipated in the high-induction region (above the maximum permeability induction). It indicates that more attention should be given to the energy dissipation mechanisms in that region, such as the domain annihilation and nucleation.
M F De Campos - One of the best experts on this subject based on the ideXlab platform.
-
modeling of sharp change in magnetic Hysteresis behavior of electrical steel at small plastic deformation
Journal of Applied Physics, 2005Co-Authors: M J Sablik, S Rios, Fernando Jose Gomes Landgraf, T Yonamine, M F De CamposAbstract:In 2.2% Si electrical steel, the magnetic Hysteresis behavior is sharply sheared by a rather small plastic deformation (0.5%). A modification to the Jiles–Atherton Hysteresis model makes it possible to model magnetic effects of plastic deformation. In this paper, with this model, it is shown how a narrow Hysteresis with an almost steplike Hysteresis Curve for an undeformed specimen is sharply sheared by plastic deformation. Computed coercivity and Hysteresis loss show a sharp step to higher values at small strain due to an n=1∕2 power law dependence on residual strain. The step is seen experimentally.
-
effect of grain size deformation aging and anisotropy on Hysteresis loss of electrical steels
Journal of Magnetism and Magnetic Materials, 2000Co-Authors: Fernando Jose Gomes Landgraf, M Emura, Julio C Teixeira, M F De CamposAbstract:The investigation of the effect of cold deformation, anisotropy, aging and grain size on the shape of the Hysteresis Curve of non-oriented electrical steels shows that most of the Hysteresis energy is dissipated in the high-induction region (above the maximum permeability induction). It indicates that more attention should be given to the energy dissipation mechanisms in that region, such as the domain annihilation and nucleation.
O Perevertov - One of the best experts on this subject based on the ideXlab platform.
-
effect of applied tensile stress on the Hysteresis Curve and magnetic domain structure of grain oriented transverse fe 3 si steel
Journal of Magnetism and Magnetic Materials, 2015Co-Authors: O Perevertov, J Thielsch, R SchaferAbstract:Abstract The effect of an elastic applied tensile stress on the quasistatic Hysteresis Curve and domain structure in conventional (110) [001] Fe-3%Si steel, cut transversely to the rolling direction, is studied. The magnetic domains and magnetization processes were observed by longitudinal Kerr microscopy at different levels of stress. It is shown that above 8 MPa the bulk Hysteresis loop can be described with a good accuracy by the action of an effective field, which is the product of the stress and a function of magnetization. Domain observation reveals that the reasons for the effective field are demagnetizing fields due to the disappearance of supplementary domains at low applied field and the formation of different domain systems in different grains at low and moderate fields. The latter are caused by differences in grain sensitivity to stress depending on the degree of misorientation and grain boundary orientation. A decrease of the effective field above 1 T is connected with a transformation of all grains into the same domain system – the column pattern. The Hysteresis loop behavior is qualitatively the same as for strips cut in rolling direction and for non-oriented strips.
-
influence of applied tensile stress on the Hysteresis Curve and magnetic domain structure of grain oriented fe 3 si steel
Journal of Physics D, 2014Co-Authors: O Perevertov, R SchaferAbstract:The influence of applied tensile stress on the Hysteresis Curve and domain structure in conventional (1 1 0)[0 0 1] Fe–3%Si steel, cut parallel to the rolling direction, is studied on samples with different grain sizes. Quasistatic Hysteresis loops under tensile stresses up to 70 MPa were measured. The magnetic domains and magnetization processes were observed by longitudinal Kerr microscopy at different levels of stress. It is shown that for stresses exceeding 5–10 MPa the bulk Hysteresis loop can be described with good accuracy by the action of an effective field, which is the product of a function of stress and a function of magnetization. The function of stress is approximately linear with a slope of one. Except for the sample with the smallest grains, the function of magnetization is linear in the magnetization range ±1.2–1.5 T, i.e. it has a typical demagnetizing field shape. Domain observation reveals that the effective field is caused by the demagnetizing fields occurring at grain boundaries and at the sheet surface due to the removal of closure domains transverse to the rolling direction by the tensile stress. The closure structure reappears at higher fields. Another indirect indication of demagnetizing fields is the fact that the Hysteresis losses drop continuously with stress and changes in the coercive force are small. The effective field of the sample with the smallest grains increases most nonlinearly with stress similar to the behaviour obtained for non-oriented material.
-
influence of applied compressive stress on the Hysteresis Curves and magnetic domain structure of grain oriented transverse fe 3 si steel
Journal of Physics D, 2012Co-Authors: O Perevertov, R SchaferAbstract:The influence of an applied compressive stress on the Hysteresis Curve and domain structure in conventional (1?1?0) [0?0?1] Fe?3%Si steel cut transverse to the rolling direction is studied. Quasistatic Hysteresis loops under compressive stress up to 75?MPa were measured. The magnetic domains and magnetization processes were observed by longitudinal Kerr microscopy at different levels of stress. It is shown that the bulk Hysteresis loop can be described with a good accuracy by the action of an effective field, which is the product of the stress and a function of magnetization. Domain observations have shown that the reasons for the effective field are demagnetizing fields due to the disappearance of supplementary domains along [0?1?0] and [1?0?0] at low fields and different domain systems in different grains at moderate fields. The latter are caused by differences in grain sensitivity to stress depending on the degree of misorientation. A decrease in the effective field above 1?T is connected with a transformation of all grains into the same domain system?the column pattern.
J Thielsch - One of the best experts on this subject based on the ideXlab platform.
-
effect of applied tensile stress on the Hysteresis Curve and magnetic domain structure of grain oriented transverse fe 3 si steel
Journal of Magnetism and Magnetic Materials, 2015Co-Authors: O Perevertov, J Thielsch, R SchaferAbstract:Abstract The effect of an elastic applied tensile stress on the quasistatic Hysteresis Curve and domain structure in conventional (110) [001] Fe-3%Si steel, cut transversely to the rolling direction, is studied. The magnetic domains and magnetization processes were observed by longitudinal Kerr microscopy at different levels of stress. It is shown that above 8 MPa the bulk Hysteresis loop can be described with a good accuracy by the action of an effective field, which is the product of the stress and a function of magnetization. Domain observation reveals that the reasons for the effective field are demagnetizing fields due to the disappearance of supplementary domains at low applied field and the formation of different domain systems in different grains at low and moderate fields. The latter are caused by differences in grain sensitivity to stress depending on the degree of misorientation and grain boundary orientation. A decrease of the effective field above 1 T is connected with a transformation of all grains into the same domain system – the column pattern. The Hysteresis loop behavior is qualitatively the same as for strips cut in rolling direction and for non-oriented strips.