Calculation of relaxation coercive force of ferromagnetic body

2011 ◽  
Vol 82 (2) ◽  
pp. 115-119
Author(s):  
S. G. Sandomirskii
2019 ◽  
Vol 85 (1(I)) ◽  
pp. 35-44
Author(s):  
S. G. Sandomirski

The main magnetic parameters sensitive to the structure of steels are the parameters of their saturation loop of magnetic hysteresis: the coercive force Hcs and remanent magnetization Mrs. The saturation magnetization or saturation intensity Mr is most sensitive to the phase composition of steels. The variety of steel grades and modes of technological treatment (e.g., heat treatment, mechanical load) determined the use of magnetic structurescopy and magnetic characteristics — the coercive force Hc, remanent magnetization Mr , and specific hysteresis losses Wh on the subloops of the magnetic hysteresis of steels — as control parameters in diagnostics of the stressed and structural states of steel structures and pipelines. It has been shown that changes in Hc, Mr , and Wh are more sensitive to structural stresses and structures of steels than the parameters of the saturation hysteresis loop of magnetic hysteresis (Hcs, Mrs, and Mrs). The formulas for calculating Hc, Mr and Wh are presented to be used for estimation of changes in the parameters upon heat treatment of steels. Features of the structural sensitivity of the subloop characteristics and expediency of their use for magnetic structural and phase analyzes are determined. Thus, the range of changes in Ìr attributed to the structural changes in steels upon gradual Hm decrease is many times wider compared to the range of possible changes in Mrs under the same conditions. Conditions (relations between the magnetic parameters) and recommendations regarding the choice of the field strength Hm are given which provide the justified use of Hc, Mr and Wh parameters in magnetic structurescopy


Alloy Digest ◽  
1972 ◽  
Vol 21 (11) ◽  

Abstract BLENDALLOY 25-7904 is an 80% nickel-15% iron-5% molybdenum alloy having very high permeability and low coercive force for magnetic cores in such applications as transformer laminations, sensitive magnetic amplifiers and magnetic shielding. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ni-181. Producer or source: Spang Industries Inc..


Alloy Digest ◽  
2016 ◽  
Vol 65 (2) ◽  

Abstract Ancorsteel phosphorus alloys are ferrous base powders for PM parts requiring superior electromagnetic performance. Compared with parts made from pure, high compressibility iron powders, those made from the phosphorus alloys have higher resistivity, permeability and induction, and reduced coercive force. The presence of phosphorus also decreases the susceptibility of a PM component to nitrogen aging. These alloys are produced by making ferrophosphorus additions to the highly compressible iron powders Ancorsteel 1000B or Ancorsteel 1000C. This datasheet provides information on physical properties, and tensile properties. It also includes information on powder metal forms. Filing Code: CS-196. Producer or source: Hoeganaes Corporation.


Alloy Digest ◽  
1972 ◽  
Vol 21 (12) ◽  

Abstract RAECO-15 is a magnet alloy of samarium and cobalt which offers 15-million energy product, an extremely high intrinsic coercive force (Hci = 15,000 Oe), and a Curie Temperature of 750 C. It is especially attractive for use in severe demagnetizing environments at elevated temperatures. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on forming, heat treating, machining, and joining. Filing Code: Co-67. Producer or source: Raytheon Microwave and Power Tube Division.


Alloy Digest ◽  
2013 ◽  
Vol 62 (11) ◽  

Abstract MAGIVAL MG2 is a free machining ferritic stainless steel grade with the same high machinability and corrosion resistance as type 430F, but offering a higher magnetic permeability and lower coercive force than MG1 (Alloy Digest SS-1159, October 2013). Magival is a group of easily workable ferritic stainless steels developed for magnetic applications where high permeability and low coercive force are required. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-1161. Producer or source: Valbruna Stainless Steel.


2003 ◽  
Author(s):  
Robert D. Newberry
Keyword(s):  

2021 ◽  
Vol 34 (1) ◽  
pp. 171-202
Author(s):  
Brian Z. Tamanaha

A century ago the pragmatists called for reconstruction in philosophy. Philosophy at the time was occupied with conceptual analysis, abstractions, a priori analysis, and the pursuit of necessary, universal truths. Pragmatists argued that philosophy instead should center on the pressing problems of the day, which requires theorists to pay attention to social complexity, variation, change, power, consequences, and other concrete aspects of social life. The parallels between philosophy then and jurisprudence today are striking, as I show, calling for a pragmatism-informed theory of law within contemporary jurisprudence. In the wake of H.L.A. Hart’s mid-century turn to conceptual analysis, “during the course of the twentieth century, the boundaries of jurisprudential inquiry were progressively narrowed.”1 Jurisprudence today is dominated by legal philosophers engaged in conceptual analysis built on intuitions, seeking to identify essential features and timeless truths about law. In the pursuit of these objectives, they detach law from its social and historical moorings, they ignore variation and change, they drastically reduce law to a singular phenomenon—like a coercive planning system for difficult moral problems2—and they deny that coercive force is a universal feature of law, among other ways in which they depart from the reality of law; a few prominent jurisprudents even proffer arguments that invoke aliens or societies of angels.


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