Impact of indentor sliding velocity and loading repetition factor on shear strain and structure dispersion in nanostructuring burnishing

The article probes into a relationship of the shear strain intensity and the shear strain rate in the surface layer and the sliding velocity of a spherical indentor and its loading repetition factor. It brings forward an experimental procedure to evaluate the shear strain intensity and rate by analyzing the geometrical parameters of the bulge of plastically edged metal and the thickness of the shifted layer relative to different sliding velocities and feed rates. © 2019 by University of Niš, Serbia

Research into Dry Turning of Welded Surface by Replaceable Cutting Insert with Closed Loop Heat Removal

A special tool has been devised incorporating a closed loop system based on Peltier thermoelectric couples to cool replaceable hard alloy inserts. Experimental research has been done into dry turning of a X20Cr13 steel welded surface with a SECO cubic boron nitride circular plate at the cutting speed increasing from 100 to 300 m/min. It has been determined that Ra surface roughness decreases by 22% while Rz surface roughness goes down by 26%; in addition, the wear flat of tool tips diminishes by 17%. © 2018 Published under licence by IOP Publishing Ltd.The work was supported by Ministry of Education and Science of the Russian Federation, contract № 02.G25.31.0148 with Sverdlovsk Instrumental Plant within the framework of Research and Development Project No Н979.210.007/15, July 28, 2015 for the federal autonomous educational institution of higher education “Ural Federal University”

Impact of Friction Stir Processing Parameters on Forming the Structure and Properties in AISI 420 Steel Surface Layer

Research has been done into the influence of friction thermomechanical treatment parameters on forming the structure and properties in a surface layer of 20X13 steel. The paper presents a theoretical approach towards controlling the process variables. A hardened layer with a thickness of 1,7 mm was obtained after 20X13 steel had been subjected to the process. The thickness of the layer that had a microhardness of ≥600HV0,05 turned out to be about 0,75mm while the microstructure of the hardened layer was martensitic, martensitic and perlitic with dispersed inclusions of carbides. It was established that the feed has the biggest influence on the thickness of the hardened layer.     Keywords: friction stir processing, rotation speed, tool feed, normal force, microhardness, microstructure

Legal nature of judicial practice

Objective: a comprehensive theoretical and legal study of the nature of judicial practice.Methods: the methodological basis of the article is postclassical rationality, which allows studying judicial practice in the context of its impact on the public relations regulation and establishing the legal nature of this phenomenon. This determined the integration of methods developed in the legal science (formal legal, comparative legal methods, method of legal modeling) and other humanities (hermeneutical, discursive methods).Results: the article considers judicial practice as an individual legal regulation, i.e. the activities of the authorized judicial bodies of the state aimed at consideration and resolution of legal cases, as well as the creation of individual legal foundations for the lawful behavior of subjects of public relations. The authors proceed from the fact that judicial practice is a unity of cognition, activity, and result, as it actively participates in the construction of legal reality. This leads to the conclusion that judicial practice should be understood dichotomically – as the activity of judges, the result of which is the creation of individual and generalizing legal acts aimed at constructing a legal reality (a specific form of legal communication), and as a material source of law (a set of generalizing legal acts (positions of courts) that have a legal impact on the consciousness and behavior of an indefinite circle of subjects of the same name).Scientific novelty: in the article, for the first time in the Russian legal science, a study of judicial practice is transferred from the level of sectoral analysis to the philosophical-legal level. At the same time, the authors emphasize the interdisciplinary, general humanitarian nature of judicial practice. The analysis and interpretation of judicial practice are carried out at the ontological and axiological levels of legal reality. This allowed identifying the specific role of judicial practice in the legal system as a means of communication between individual and general legal regulation.Practical significance: the main provisions and conclusions of the article can be used in scientific and pedagogical activities when considering the essence and content of judicial practice and its role in the creation and functioning of the Russian legal reality, as well as for improving judicial activity at all levels

Legitimation of law in juridical discourse

Objective: to study the philosophical and social mechanisms of legitimization of law in the modern legal discourse. Methods: the methodological basis of the study is the concept of legal discourse by Y. Habermas, which allows considering the said issue in the context of legal interaction between the state and society, taking into account the modern trends of social and legal development.Results: it is concluded that the process of legitimization of law under modern conditions is of a conventional nature, implying the establishment of mutual rights and obligations of the state as a lawmaker and the society as a subject and object of state activity. As a subject, the society provides legal discourse with the necessary interpretation of social needs and forms a legitimate image of law, the implementation of which is based on socially active behavior of citizens. As an object, the society is the key element of the goal-setting of state law-making aimed at the creation and maintenance of security and legal order. The legislative activity and law enforcement acquire the necessary legitimacy only when the state’s perceptions of the images of objective and subjective social needs are identical.Scientific novelty: based on the discourse analysis of social development, the features of the law legitimization mechanism under modern conditions are revealed. In particular, the law created by this mechanism will be characterized by the following features: a) it acts as an intermediary in the interaction between the political system and a person (public administration and the economic system); b) it acts as a system of rules governing relations between the state and society at individual and normative levels of legal regulation. The legal norms establishing prohibitions must be justified in terms of moral and political discourse. This justification becomes an element of their legitimization and indicates the achievement of social consensus in relation to the claims of the state to its right/duty to form and maintain public security and the rule of law. Practical significance: the main provisions and conclusions of the article can be used in scientific and pedagogical activity when considering the nature and content of legal development

Discourse of corruption in the Russian society

Objective: to study the socio-cultural and legal nature of the corruption phenomenon in a discursive and communicative context.Methods: the methodological basis of the article is the synthesis of the discursive and communicative theory of J. Habermas and W. Krawietz’s integrative theory of legal reality, focusing on the interdisciplinary study of corruption as an interdisciplinary category, taking into account not only objective, but also subjective components. This determined the choice of research methods (comparative, hermeneutic, and discursive methods).Results: corruption as a phenomenon and the interdisciplinary category reflecting it is determined by social, cultural and psychological factors of the legal reality development. Acting as a complex legal archetype, it defines the value attitudes of consciousness and behavior of the legal communication participants, orienting them to carry out actions aimed at satisfying individual (less often group and social) interests, even if they contradict the law. Corrupt behavior is perceived by a large part of the Russian society as a model of hierarchical interaction of the legal communication subjects, the purpose of which, according to the addressee, is to increase the effectiveness of the addressee’s activities. In addition, corruption is becoming an informal means of “liberation” from the legal requirements, rigid and unfair, according to some representatives of the society. In these conditions, the success of the institutional fight against corruption can be achieved only if this fight involves not only improvement of anti-corruption legislation, but also countering shadow norms, creating a system of anti-incentives for corrupt behavior, including ideologically, through the formation of value attitudes of citizens to reject corrupt practices as unpatriotic and harmful to the rule of law and the legal culture of the society as a whole.Scientific novelty: for the first time in Russian jurisprudence, a study of the category of corruption in the communicative and discursive aspect was conducted.Practical significance: the main provisions and conclusions of the article can be used in scientific and pedagogical activities when considering the issues of the essence and content of the Russian legal reality, in the anti-corruption activities of state and municipal bodies, as well as in anti-corruption education

Crystal Undulator As A Novel Compact Source Of Radiation

A crystalline undulator (CU) with periodically deformed crystallographic planes is capable of deflecting charged particles with the same strength as an equivalent magnetic field of 1000 T and could provide quite a short period L in the sub-millimeter range. We present an idea for creation of a CU and report its first realization. One face of a silicon crystal was given periodic micro-scratches (grooves), with a period of 1 mm, by means of a diamond blade. The X-ray tests of the crystal deformation have shown that a sinusoidal-like shape of crystalline planes goes through the bulk of the crystal. This opens up the possibility for experiments with high-energy particles channeled in CU, a novel compact source of radiation. The first experiment on photon emission in CU has been started at LNF with 800 MeV positrons aiming to produce 50 keV undulator photons.Comment: Presented at PAC 2003 (Portland, May 12-16

Effects of Sliding Velocity and Thermal Conduction of the Tool on X20Cr4 Steel Friction Coefficient and Structure in Nanostructuring Burnishing

The developmental study has succeeded in finding how the sliding velocity of an indenter affects the friction coefficient and changes the structure and phase state in the surface layer of a X20Cr13 stainless steel when nanostructuring burnishing is done with a tool with no heat removal and, alternatively, when the tool is equipped with a cooling system. It has been shown that structural dispersion of the treated material results in obtaining 20⋯80 nm nanocrystallites if the friction coefficient of the spherical synthetic diamond indenter is within 0.15⋯0.18 nm. Application of a compact cooling system, based on Peltier's thermoelectric module, made it possible to stabilize the friction coefficient at 0.17 and to increase the sliding velocity from 13 m/min, this being the case of no heat removal, to 45 m/min in the case when the cooling system having a cooling performance of 120 W was used. TEM and SEM analyses of the surface layer structure confirmed that there is a correlation between the friction coefficient and the size of nanocrystallites and the thickness of the dispersed layer. EBSD analysis of the structure showed that a maximum permissible sliding velocity can be established as referenced to the nucleation and growth of γ-phase grains in the nanostructured layer caused by heating of the material under deformation and reaching the temperature beyond the point α→γ phase transition as well as by behavior of dynamic recrystallization. It was established that the heat removal ensures suppression of dynamic recrystallization when the sliding velocity is increased up to 50 m/min. © 2018 Published under licence by IOP Publishing Ltd