scholarly journals INFLUENCE OF MACHINING TECHNOLOGIES ON VALUES OF RESIDUAL STRESSES OF OXIDE CUTTING CERAMICS

2017 ◽  
Vol 9 ◽  
pp. 13
Author(s):  
Jakub Němeček ◽  
Kamil Kolařík ◽  
Jiří Čapek ◽  
Nikolaj Ganev
Keyword(s):  
Residual Stresses ◽  
State University ◽  
X Ray Diffraction ◽  
Engineering Ceramic ◽  
Surface Residual Stresses ◽  
University Of Technology ◽  
Cutting Ceramic ◽  
Cutting Ceramics ◽  
Moscow State University ◽  
Made In

Currently, the intensive development of engineering ceramic and effort to replace sintered carbides as cutting materials are in progress. With the development of the sintering technology it is now possible to produce compact ceramic cutting samples with very good mechanical properties. The advantage of these materials is their easy accessibility and low purchase price. In this work, the influence of the finishing machine technology on the values of surface residual stresses of cutting ceramic samples Al2O3+TiC were studying. The samples were supplied by Moscow State University of Technology STANKIN. Measurements made in the X-ray diffraction laboratory at the Department of solid state engineering were performed for both the phases. The influence of the parameters of machining to residual stresses was studied and the resulting values were compared with each other.

Influence of Milling Parameters on Surface Residual Stresses of 7050-T7451 Aluminum Alloy

2012 ◽  
Vol 723 ◽  
pp. 208-213 ◽  
Author(s):  
Yi Wan ◽  
Chen Li ◽  
Zhan Qiang Liu ◽  
Shu Feng Sun
Keyword(s):  
Aluminum Alloy ◽  
Residual Stresses ◽  
Cutting Speed ◽  
Cutting Parameters ◽  
Milling Process ◽  
X Ray Diffraction ◽  
Orthogonal Direction ◽  
Mechanical Coupling ◽  
Surface Residual Stresses ◽  
Compressive Residual Stresses

Residual stresses generated in milling process affect the performance of machined components. Milling residual stresses correlate closely with the cutting parameters. In this paper, the generation and distribution of surface residual stresses in milling of aluminum alloy 7050-T7451 was investigated. The cutting speed changes from 300m/min to 3000m/min. In the experiments, the residual stresses on the surface of specimen are detected by X-ray diffraction technique. The result shows that compressive residual stresses are generated when cutting speed is under 500 m/min. In feed and its orthogonal direction, the effect of cutting speed and feed rate on residual stresses is similar. The formation of the residual stresses can be explained by thermo-mechanical coupling effects.

Nondestructive Monitoring of Variations of Residual Stresses in Steel Weldments by Magnetic Barkhausen Noise Method

2013 ◽  
Author(s):  
C. Hakan Gür ◽  
Gökhan Erian ◽  
Caner Batıgün ◽  
İbrahim Çam
Keyword(s):  
Residual Stresses ◽  
Calibration Procedure ◽  
Steel Plates ◽  
Barkhausen Noise ◽  
Nondestructive Monitoring ◽  
Magnetic Barkhausen Noise ◽  
X Ray Diffraction ◽  
Critical Data ◽  
Surface Residual Stresses ◽  
Welding Processes

Variations of surface residual stresses as a function of weld runs in API 5L X70 steel plates were non-destructively monitored by Magnetic Barkhausen Noise (MBN) method. After each weld run, MBN signal and hardness distributions were recorded. MBN signals were converted into stress values by using a specific calibration procedure. The results were analyzed by considering microstructure investigations and hardness measurements, and then, they were compared with the results of X-ray diffraction measurements. MBN method seems to be a good candidate for monitoring the variation of surface residual stresses. It may also provide critical data for computer simulation and process design of welding processes.

Problems Related to Creation of Scientific Schools in Pedagogy

10.12737/619 ◽  
2013 ◽  
Vol 2 (2) ◽  
pp. 3-7 ◽  
Author(s):  
Артемьева ◽  
Svetlana Artemyeva
Keyword(s):  
Quality Monitoring ◽  
Education Quality ◽  
Scientific School ◽  
State University ◽  
The Past ◽  
Scientific Schools ◽  
University Of Technology ◽  
School Formation ◽  
Moscow State University

The author analyzes the content of concept «scientific school» in the past and present times, describes the experience of «Education Quality Monitoring» scientific school formation on the basis of «Pedagogy and Psychology» Chair of Moscow State University of Technology and Management named after K.G. Razumovsky.

Determination of Surface Residual Stresses in Machined Ceramics Using Indentation Fracture

1996 ◽  
Vol 118 (4) ◽  
pp. 483-489 ◽  
Author(s):  
Y. Ahn ◽  
S. Chandrasekar ◽  
T. N. Farris
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Soda Lime Glass ◽  
X Ray Diffraction ◽  
Reliable Technique ◽  
X Ray ◽  
Indentation Technique ◽  
Vickers Indenter ◽  
Surface Residual Stresses ◽  
Zn Ferrite

Machining produces surface residual stresses which significantly influence the strength and wear resistance of ceramic components. As new methods are developed for machining ceramics, a quick and reliable technique for measurement of residual stresses would be valuable in assessing the viability of these methods from a residual stress perspective. The residual stresses on ground and polished (i.e. machined) surfaces of soda-lime glass, Ni-Zn ferrite, and silicon nitride have been measured using an indentation technique with a Vickers indenter. In this technique, the surface extent of the median/radial cracks produced by the Vickers indenter in machined and in annealed ceramics are measured. These are then combined with a fracture mechanics analysis to estimate the surface residual stresses produced by machining. In order to determine the validity of the indentation technique for estimating machining residual stresses, these stresses were also measured using an X-ray diffraction and a deflection method. The residual stress values determined using the indentation technique in the machined ceramics were found to be reasonably close to those obtained from the X-ray diffraction and deflection methods. Since the indentation technique is relatively simple and easily applied, it offers a promising method for evaluating surface residual stresses in machined ceramics.

scholarly journals Protestivity and civic activism in youth: problems and contradictions

2021 ◽  
Vol 103 ◽  
pp. 01051
Author(s):  
Irina V. Polozhentseva ◽  
Galina N. Yulina ◽  
Tat’yana L. Kashchenko ◽  
Vitaly V. Kalita
Keyword(s):  
Empirical Study ◽  
Social Expectations ◽  
State University ◽  
Civic Activism ◽  
Network Interaction ◽  
University Of Technology ◽  
Methodological Approaches ◽  
Definition Of ◽  
Moscow State University ◽  
Protest Activity

The present study combines a theoretical analysis of youth protest as a special social phenomenon and the results of an empirical study. Based on the empirical study conducted by the authors in the Moscow State University of Technology and Management (First Cossack University), an analysis of the protest activity of youth (students) in the 2010s is conducted. The authors rely on a set of methodological approaches and methods of analysis: conceptual, behaviorist, and socio-cultural approaches, as well as the network approach aimed at understanding the basic constructs of the digital age and digital communications as a new social reality. The authors develop the method of discourse analysis to demonstrate the protest activism being contingent on the rapidly changing conditions. The modern definition of protest is analyzed. The term protestivity is introduced and its heuristic value is substantiated. The distinction between civic activism and protestivity is drawn. The authors explore the preconditions for the formation of protest: youth lumpenization, deprivation (inconsistency between the increased social expectations of young people and the real possibilities for their realization). The manifestations of youth protestivity in the modern conditions increasingly acquiring the structure of network interaction are studied. It is concluded that the repertoire of youth protestivity in a digital society is modifying. The article demonstrates that positive (constructive) forms of protest activity contribute to the formation of a conventional form of interaction between youth and authorities. Involvement in positive forms of activism stops the natural potential of youth protest. The future largely depends on what status the authorities assign to youth.

scholarly journals INVESTIGATION OF SURFACE MACROSCOPIC RESIDUAL STRESSES OF CUTTING CERAMICS AFTER MECHANICAL MACHINING

2018 ◽  
Vol 17 ◽  
pp. 6
Author(s):  
Jakub Němeček ◽  
Jiří Čapek ◽  
Nikolaj Ganev ◽  
Kamil Kolařík
Keyword(s):  
Residual Stresses ◽  
Surface Structure ◽  
Cemented Carbides ◽  
Machining Parameters ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cutting Ceramics ◽  
Mechanical Machining

Currently, the extensive research in the field of cutting ceramics is conducted and there are efforts to replace cemented carbides by these materials. However, the problem is to improve the production of ideal compact samples. Therefore, the influence of mechanical machining technologies on the values of macroscopic residual stresses was investigated by X-ray diffraction. The resulting values were discussed depending on machining parameters and surface structure of the studied samples.

scholarly journals Material Removal, Correction and Laboratory X-Ray Diffraction

2014 ◽  
Vol 996 ◽  
pp. 181-186 ◽  
Author(s):  
Eric Wasniewski ◽  
Baptiste Honnart ◽  
Fabien Lefebvre ◽  
Eric Usmial
Keyword(s):  
Residual Stress ◽  
Stress Relaxation ◽  
Stress Field ◽  
Residual Stresses ◽  
Material Removal ◽  
Stress Gradient ◽  
X Ray Diffraction ◽  
X Ray ◽  
Surface Residual Stresses ◽  
Residual Stress Gradient

Laboratory X-ray diffraction is commonly used for surface residual stresses determination. Nevertheless, the in-depth residual stress gradient also needs to be known. Chemical or electro-polishing method is generally used for material removal. However, material removal may seek a new equilibrium and stress field may change in such a way that experimental residual stress values must be corrected. Different methods exist to account for the residual stress relaxation associated with the material removal operation and will be discussed in this paper.

scholarly journals ИССЛЕДОВАНИЕ АБСОРБЦИИ УГЛЕКИСЛОГО ГАЗА В ВОЛОКНИСТОМ ТУМАНОУЛОВИТЕЛЕ

2010 ◽  
Vol 18 (1) ◽  
pp. 32-37 ◽  
Author(s):  
Arnold Waldberg ◽  
Evgenija Polienova
Keyword(s):  
Effective Means ◽  
Main Element ◽  
Experimental Plant ◽  
Co2 Absorption ◽  
State University ◽  
Municipal Services ◽  
Fibrous Filters ◽  
Quantitative Results ◽  
Moscow State University ◽  
Made In

Industrial tests of fibrous filters have shown that, above mist drop collecting, they are effective means for adsorption of gaseous impurities. Considering it, there were made tests that enabled reaching quantitative results on CO2 absorption by aqueous solution of sodium. Tests were made on experimental plant using apparatus with fibrous nozzle as its main element. Absorber studies were made in the laboratory of engineering ecology of municipal services at Moscow State University of Environmental Engineering (MSUEE). Experimental plant is automated: controlling and regulation of regime parameters of the absorber are made using the monitor of a personal computer. Santrauka Atlikus pluoštiniu filtru pramoninius tyrimus nustatyta, kad šie filtrai, laikomi virš ruko lašeliu, efektyviai adsorbuoja dujose esancius nešvarumus. Atsižvelgiant i tai buvo atliekami tyrimai su natrio šarmo tirpalu ir gauti kiekybiniai CO2 absorbcijos rezultatai. Tirta eksperimentinimis salygomis naudojant prietaisus su pluoštiniu antgaliu. Absorberio tyrimai buvo atliekami Miestu inžinerinis ekologijos laboratorijoje Maskvos valstybiniame aplinkos inžinerijos universitete (AIMVU). Eksperimentinis tyrimas automatizuotas, absorberio režimo parametrai kontroliuojami ir reguliuojami asmeniniu kompiuteriu. Резюме Промышленные испытания волокнистых фильтров показали, что помимо улавливания капель туманов, они достаточно эффективно поглощают и газообразные вредности. В связи с этим на экспериментальной установке, основным элементом которой являлся аппарат с волокнистой насадкой, были проведены исследования, позволившие получить количественные результаты по абсорбции СО2 водным раствором соды. Исследования абсорбера проводились в лаборатории кафедры «Инженерная экология городского хозяйства» Московского государственного университета инженерной экологии (МГУИЭ). Экспериментальная установка автоматизирована: контроль и регулировка режимных параметров абсорбера осуществляются с экрана персонального компьютера.

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