scholarly journals Analysis of tribotechnical characteristics of self-fluxing coating under rolling and sliding at non-stationary loading

2016 ◽  
Vol 2 (1(28)) ◽  
pp. 4
Author(s):  
Оксана Александровна Микосянчик ◽  
Борис Артемович Ляшенко ◽  
Максим Сергеевич Агеев ◽  
Виталий Николаевич Лопата
Keyword(s):  
Stationary Loading ◽  
Tribotechnical Characteristics

Tribotechnical Characteristics of Titanium Nitride Coating for Heavy-Duty Friction Clutches.

1980 ◽  
Vol 41 (5) ◽  
pp. 558-566
Author(s):  
O. Yu Elagina ◽  
◽  
D.O. Kolbas ◽  
A.G. Buklakov ◽  
N. Derr ◽  
...  
Keyword(s):  
Titanium Nitride ◽  
Nitride Coating ◽  
Heavy Duty ◽  
Titanium Nitride Coating ◽  
Tribotechnical Characteristics

Tribotechnical characteristics of hard alloys in sliding friction units

2020 ◽  
pp. 87-97
Author(s):  
K. D. Khromushkin ◽  
B. G. Ushakov ◽  
A. V. Kochergin ◽  
R. A. Suleev ◽  
O. N. Parmenova
Keyword(s):  
Experimental Data ◽  
Sliding Friction ◽  
Heating Temperature ◽  
Hard Alloys ◽  
Friction Units ◽  
Wear And Friction ◽  
Friction Path ◽  
Friction Parameters ◽  
Tribotechnical Characteristics ◽  
Temperature Surface

The paper presents experimental data on the study of the friction parameters of hard alloys in sliding friction units, including the heating temperature, surface roughness, wear and friction coefficient, depending on the duration of the test and the friction path.

Probabilistic Analysis of Random Structural Intensity for Structural Members under Stochastic Loadings

2015 ◽  
Vol 12 (03) ◽  
pp. 1550013 ◽  
Author(s):  
Siu-Siu Guo ◽  
Dongfang Wang ◽  
Zishun Liu
Keyword(s):  
Energy Flow ◽  
Early Stage ◽  
Structural Members ◽  
Structural Intensity ◽  
Dynamic Loadings ◽  
Arbitrary Section ◽  
Stationary Loading ◽  
Fpk Equation ◽  
Definition Of ◽  
Probability Density Function Pdf

The concept of structural intensity (SI) is extended to the random domain by introducing a physical quantity denominated random structural intensity (RSI). This quantity is formulated for mechanical systems whose dynamical responses are stochastic due to random excitations. In order to fully characterize the stochastic behavior of a system under random loadings, it is imperative to obtain the probability density function (PDF) of RSI. Based on the elastic theory and the definition of SI, RSI is expressed as functions of system responses. In general, the PDF of system responses is governed by Fokker–Planck–Kolmogorov (FPK) equation under the assumption that random dynamic loadings are idealized as white noise excitations. Therefore, the PDF of RSI is derived with the joint PDF of system responses. In the present study, four demonstrating cases of beams and plates under separately concentrated and uniform random loadings are studied to investigate the properties of RSI. Stationary and non-stationary PDFs of RSI at arbitrary section of beam and plate are obtained. Numerical results show that the PDF of RSI is transient at early stage of stationary loading and then converges to the exact stationary ones as time increases. With the obtained PDFs of RSI, energy transmission path over the beam and plate can be determined, which is guided from the locations with lower probabilities of RSI to the ones with higher probabilities of RSI. Furthermore, virtual energy flow sinks on the plate and beam can be found, which are identified by the locations with the maximum probabilities of RSI.

Thermochemical synthesis of tribotechnical coatings based on molybdenum diselenide MoSe2 on structural steels

2021 ◽  
Author(s):  
T.A. Lobova ◽  
◽  
A.G. Kolmakov ◽  
V.I. Bodnarchuk ◽  
E.A. Marchenko ◽  
...  
Keyword(s):  
Structural Steels ◽  
Study Results ◽  
Selenium Vapor ◽  
Molybdenum Diselenide ◽  
Time Parameters ◽  
Temperature Time ◽  
Tribotechnical Characteristics ◽  
Selenization Process ◽  
Thermochemical Synthesis

The study results of the influence of parameters of the process of chemical-thermal treatment in selenium vapor during the preparation of solid lubricating coatings from molybdenum diselenide on specimens of structural steels with a plasma Mo-coating are presented. An empirical mathematical model of the temperature-time parameters of the Mo selenization process is proposed, which makes possible to control the quality of the obtained coatings depending on requirements for their tribotechnical properties. An assessment of their tribotechnical characteristics in air and in vacuum in the temperature range 20—600 °С has been carried out.

Study of operational properties of steel friction pairs with antifriction coating from copper alloys produced by electric spark alloying

2021 ◽  
Vol 4 ◽  
pp. 31-41
Author(s):  
L. I. Kuksenova ◽  
◽  
D. A. Kozlov ◽  
M. S. Alekseeva ◽  
◽  
...  
Keyword(s):  
Friction Pair ◽  
Copper Alloys ◽  
Protective Atmosphere ◽  
Coated Steel ◽  
Antifriction Coating ◽  
Wear Mode ◽  
Number Of Passes ◽  
Surface Mechanics ◽  
Tribotechnical Characteristics ◽  
High Contact Pressure

Improving the reliability, durability and safety of operation of heavily loaded friction units is an urgent problem in physics, chemistry and surface mechanics. The tribotechnical characteristics of coatings made of bronzes BrAZhMts10-3-1.5 and BrMtsF3-6, applied by electrospark alloying on bushings made of structural steel 30KhGSN2A for operation under conditions of high contact pressure under friction without lubrication, have been investigated. Modes of coating deposition from the standpoint of tribology (the value of the electric discharge current in a pulse, the value of the longitudinal electrode feed per one rotation of the part, the rotation speed of the workpiece, the number of passes during processing, finishing of the coating) have been developed. It was found that when applying bronze BrMtsF3-6 to obtain a high-quality coating, the process must be performed in a protective atmosphere of argon to prevent phosphorus burnout. The tribotechnical efficiency of coatings when working under dry friction conditions is shown. For the steady-state wear mode, the friction coefficient is 0.10 – 0.13 at a pressure of 200 – 250 MPa, the wear resistance of coated steel is doubled. Steel with a bronze coating BrAZhMts10-3-1.5 has a higher bearing capacity, with BrMtsF3-6 coating — a higher antifriction. The ways of increasing the service life of steel-coated steel friction pair are analyzed.

scholarly journals High temperature creep of steel 09G2S under non-stationary loading

2017 ◽  
Vol 894 ◽  
pp. 012123 ◽  
Author(s):  
S V Iyavoynen ◽  
I A Banshchikova ◽  
I V Lubashevskaya ◽  
M A Legan
Keyword(s):  
High Temperature ◽  
High Temperature Creep ◽  
Steel 09G2s ◽  
Temperature Creep ◽  
Stationary Loading

scholarly journals Forecasting the properties of linear block-copoliurethanes based on oligoesters of regular structure

2021 ◽  
pp. 4-10
Author(s):  
V.N. Anisimov ◽  
◽  
V.V. Anisimov
Keyword(s):  
Molecular Structure ◽  
Regular Structure ◽  
High Strength ◽  
Operating Conditions ◽  
Properties Of Materials ◽  
Reasonable Choice ◽  
The Relationship ◽  
Tribotechnical Characteristics ◽  
Quality Indexes ◽  
Linear Block

We showed that the development of recommendations for a reasonable choice of linear block copolyurethanes that would be optimal for given operating conditions is still intuitive and does not consider the features of the molecular structure and the nature of initial components. We suggested a new scientifically grounded approach to the creation of linear block-copolyurethanes with increased wear resistance in relation to strength, deformation, thermophysical and tribotechnical characteristics. To simplify analysis of the properties of the studied materials, a mathematical model was developed, which describes the relationship between all considered properties of materials and their structure. We proposed to assess the relationship between structure and properties of the investigated materials by using quality indexes. Maximum values of quality indexes, depending on the operating conditions, correspond to different contents of hard blocks (Pc), and, consequently, to different molecular structure of the studied polyurethanes. Thus, it is reasonable to use block-copolyurethanes based on OBGA500 with a maximum content of hard blocks (Рс>60%) for operating conditions where it is necessary to provide high strength characteristics. Polyurethanes synthesized with the formation of clusters of hard blocks in the range of 45–55% are recommended for the use as wear-resistant materials.

scholarly journals Design of mated parts using polymeric materials with enhanced tribotechnical characteristics

2020 ◽  
Vol 5 (12 (107)) ◽  
pp. 49-57
Author(s):  
Anatolii Kobets ◽  
Viktor Aulin ◽  
Oleksii Derkach ◽  
Dmytro Makarenko ◽  
Andrii Hrynkiv ◽  
...  
Keyword(s):  
Polymeric Materials ◽  
Tribotechnical Characteristics
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