Correlation between friction coefficient and friction vibration in running-in process based on cross recurrence plots

2021 ◽  
pp. 1-22
Author(s):  
Yuankai Zhou ◽  
Minglong Peng ◽  
Xue Zuo
Keyword(s):  
Friction Coefficient ◽  
Dynamic Analysis ◽  
Recurrence Rate ◽  
Dry Friction ◽  
Recurrence Plot ◽  
Line Length ◽  
Recurrence Plots ◽  
Lubrication Conditions ◽  
Cross Recurrence Plot ◽  
Diagonal Length

Abstract Friction coefficient is difficult to measure in real application, whether it can be replaced by friction coefficient for dynamic analysis is an urgent issue to be solved. To study the correlation between the two signals, the friction tests were carried out under dry friction, starved and flooded lubrications, respectively. Cross recurrence plot (CRP) and its measures (recurrence rate, determinism, average diagonal line length and entropy) were used to explore the correlation. The results show that the more obvious the diagonal structures in CRPs, the stronger the correlation between the two signals, and average diagonal length is more sensitive to the degree of correlation. Irrespective of lubrication conditions, friction coefficient and vibration measured in a friction system have similar recursive characteristics. Thus, friction coefficient or vibration can be selected according to the convenience of measurement to monitor the running-in process.

scholarly journals EXPERIMENTAL EVALUATION OF DRAW BEAD COEFFICIENT OF FRICTION

2017 ◽  
Vol 23 (4) ◽  
pp. 337 ◽  
Author(s):  
Tomasz Trzepieciński ◽  
Romuald Fejkiel ◽  
Andrzej Kubit
Keyword(s):  
Friction Coefficient ◽  
Dry Friction ◽  
Digital Image Analysis ◽  
Test Material ◽  
Experimental Investigations ◽  
Special Device ◽  
Degree Of Deformation ◽  
Tool Surface ◽  
Sheet Deformation ◽  
Lubrication Conditions

<p class="AMSmaintext">In this paper the results both of friction coefficient and springback testing using a drawbead test are presented. Deep drawing quality steel sheet (DC04 according to EN 10130:2009 standard) was used as a test material. The experimental investigations were carried out using a special device that allows a change in the degree of deformation of the sheet metal on the drawbead. The friction tests were carried out for different values of tool surface roughness, specimen widths and degrees of sheet deformation. Three lubrication conditions were analysed: dry friction, machine oil lubrication and lubrication by using methacrylic resin. The springback values are determined based on the digital image analysis for selected friction conditions. It was found that effectiveness of reducing of friction coefficient value during pulling a sheet on the drawbead depends not only on the used lubricant, but also on the degree of sheet deformation (displacement of the middle roll). The sheet widths influence the friction coefficient value by the character of sheet deformation during pulling the sheet through the drawbead.</p>

scholarly journals Cross recurrence plot based synchronization of time series

2002 ◽  
Vol 9 (3/4) ◽  
pp. 325-331 ◽  
Author(s):  
N. Marwan ◽  
M. Thiel ◽  
N. R. Nowaczyk
Keyword(s):  
Time Series ◽  
Sediment Cores ◽  
Real Data ◽  
Recurrence Plot ◽  
Magnetic Data ◽  
Data Series ◽  
Recurrence Plots ◽  
Makarov Basin ◽  
The Cross ◽  
Cross Recurrence Plot

Abstract. The method of recurrence plots is extended to the cross recurrence plots (CRP) which, among others, enables the study of synchronization or time differences in two time series. This is emphasized in a distorted main diagonal in the cross recurrence plot, the line of synchronization (LOS). A non-parametrical fit of this LOS can be used to rescale the time axis of the two data series (whereby one of them is compressed or stretched) so that they are synchronized. An application of this method to geophysical sediment core data illustrates its suitability for real data. The rock magnetic data of two different sediment cores from the Makarov Basin can be adjusted to each other by using this method, so that they are comparable.

THE EFFECT OF PRESSURE AND TIME OF STATIONARY CONTACT UNDER LOAD ON THE STATIC FRICTION COEFFICIENT OF POLYURETHANE ELASTOMERS (EPUR) DURING FRICTION ON STEEL IN VARIOUS LUBRICATING CONDITIONS

Tribologia ◽  
2020 ◽  
Vol 289 (1) ◽  
pp. 21-29
Author(s):  
Dymitry CAPANIDIS ◽  
Justyna SOKOLSKA
Keyword(s):  
Friction Coefficient ◽  
Dry Friction ◽  
Contact Time ◽  
Static Friction ◽  
Polyurethane Elastomers ◽  
Static Friction Coefficient ◽  
High Adhesion ◽  
Stationary Contact ◽  
Lubrication Conditions ◽  
Unit Pressure

Tribological tests were aimed at determining the value of static friction coefficient μ0 of EPUR with hardnesses 75, 80, 83, and 93 ° Sh A, during friction on C45 steel under various lubrication conditions. In the tests, the unit pressure values in the range of p = 0.2 – 0.8 MPa and the time of stationary contact under load were changed in the range of t = 1 – 9 min, both in dry friction conditions, lubricating with water, and lubricating with two types of greases – with low and high adhesion to steel. The tests were carried out on a device whose operating principle is based on an inclined plane. The results of the tests showed that both the unit pressure and the stationary contact time have a significant impact on the value of the static friction coefficient in the EPUR-steel pair.

scholarly journals The Impact of Heat Treatment on the Behavior of a Hot-Dip Zinc Coating Applied to Steel During Dry Friction

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 660
Author(s):  
Dariusz Jędrzejczyk ◽  
Elżbieta Szatkowska
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Friction Coefficient ◽  
Dry Friction ◽  
Zinc Coating ◽  
Pin On Disc ◽  
The One ◽  
The Impact ◽  
Coating Hardness ◽  
Anticorrosion Properties

The analyzed topic refers to the wear resistance and friction coefficient changes resulting from heat treatment (HT) of a hot-dip zinc coating deposited on steel. The aim of research was to evaluate the coating behavior during dry friction after HT as a result of microstructure changes and increase the coating hardness. The HT parameters should be determined by taking into consideration, on the one hand, coating wear resistance and, on the other hand, its anticorrosion properties. A hot-dip zinc coating was deposited in industrial conditions (according EN ISO 10684) on disc-shaped samples and the chosen bolts. The achieved results were assessed on the basis of tribological tests (T11 pin-on-disc tester, Schatz®Analyse device, Sindelfingen, Germany), microscopic observations (with the use of optical and scanning microscopy), EDS (point and linear) analysis, and microhardness measurements. It is proved that properly applied HT of a hot-dip zinc coating results in changes in the coating’s microstructure, hardness, friction coefficient, and wear resistance.

scholarly journals Comparison Between the Action of Nano-Oxides and Conventional EP Additives in Boundary Lubrication

Lubricants ◽  
2020 ◽  
Vol 8 (5) ◽  
pp. 54
Author(s):  
Valdicleide Silva Mello ◽  
Marinalva Ferreira Trajano ◽  
Ana Emilia Diniz Silva Guedes ◽  
Salete Martins Alves
Keyword(s):  
Friction Coefficient ◽  
Boundary Lubrication ◽  
Friction And Wear ◽  
Film Formation ◽  
Environmental Issues ◽  
Protective Film ◽  
Extreme Pressure ◽  
Extreme Pressure Additives ◽  
Environmental Requirements ◽  
Lubrication Conditions

Additives are essential in lubricant development, improving their performance by the formation of a protective film, thus reducing friction and wear. Some such additives are extreme pressure additives. However, due to environmental issues, their use has been questioned because their composition includes sulfur, chlorine, and phosphorus. Nanoparticles have been demonstrated to be a suitable substitute for those additives. This paper aims to make a comparison of the tribological performance of conventional EP additives and oxides nanoparticles (copper and zinc) under boundary lubrication conditions. The additives (nanoparticles, ZDDP, and sulfur) were added to mineral and synthetic oils. The lubricant tribological properties were analyzed in the tribometer HFRR (high frequency reciprocating rig), and during the test, the friction coefficient and percentual of film formation were measured. The wear was analyzed by scanning electron microscopy. The results showed that the conventional EP additives have a good performance owing to their anti-wear and small friction coefficient in both lubricant bases. The oxides nanoparticles, when used as additives, can reduce the friction more effectively than conventional additives, and displayed similar behavior to the extreme pressure additives. Thus, the oxide nanoparticles are more environmentally suitable, and they can replace EP additives adapting the lubricant to current environmental requirements.

Friction and Wear Behaviors of Solid Lubricants/Polyimide Composites in Liquid Mediums

2010 ◽  
Vol 654-656 ◽  
pp. 2763-2766 ◽  
Author(s):  
Li Wen Mu ◽  
Xin Feng ◽  
Yi Jun Shi ◽  
Huai Yuan Wang ◽  
Xiao Hua Lu
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Tribological Properties ◽  
Alkaline Solution ◽  
Dry Friction ◽  
Friction And Wear ◽  
Solid Lubricants ◽  
Polyimide Composites ◽  
Inorganic Fillers ◽  
Ptfe Composites

The tribological properties of polyimide (PI) composites reinforced with graphite or MoS2 sliding in liquid alkali and water as well as dry friction were investigated using a ring-on-ring tester. The results show that the friction coefficient (μ) and wear rate (W) for both graphite/PI and MoS2/PI composites in different liquid mediums are μdry>μwater >μalkali and Wwater>Wdry >Walkali. Results also indicate that the friction coefficient and wear rate of the PI composites filled with different solid lubricants are μMoS2 >μgraphite and W MoS2 >Wgraphite in different liquid mediums. In addition, the hydrophobic inorganic fillers are fit for the reinforcement of polymer-based composites sliding in liquid mediums. It is also concluded from the authors’ work that the wear rate and friction coefficient of polymer-based (such as PI, PTFE) composites in the alkali lubricated conditions is lowest among all the friction conditions. This may be attributed to the ionic hydration in the alkaline solution.

Numerical Investigation of Size Effect on Dry Friction Behavior in Micro Upsetting Process

2014 ◽  
Vol 997 ◽  
pp. 321-324
Author(s):  
Wei Zheng ◽  
Guang Chun Wang ◽  
Bing Tao Tang ◽  
Xiao Juan Lin ◽  
Yan Zhi Sun
Keyword(s):  
Friction Coefficient ◽  
Size Effect ◽  
Dry Friction ◽  
Normal Pressure ◽  
Friction Model ◽  
Strain Hardening Exponent ◽  
Forming Process ◽  
Friction Behavior ◽  
Initial Yield Stress ◽  
Coulomb’S Friction

After modifying the Wahime/Bay friction model, a new friction model suitable for micro-forming process without lubrication is established. In this model, it is shows that the friction coefficient is a function of strain hardening exponent, the normal pressure and the initial yield stress of material. Based on the experimental data, the micro-upsetting process is simulated using the proposed friction model. The simulation results are used to investigate the size effect on the dry friction behavior. It is found that the Coulomb’s friction coefficient is dropping with miniaturization of specimens when the amount of reduction is not too large.

scholarly journals Revisiting the friction of high entropy alloys and coatings

2019 ◽  
pp. 34-37
Author(s):  
Viktor Mikhailovich Yurov ◽  
Sergei Alekseevich Guchenko
Keyword(s):  
Friction Coefficient ◽  
Gibbs Energy ◽  
Dry Friction ◽  
Nonlinear Dependence ◽  
High Entropy Alloys ◽  
New Approach ◽  
High Entropy

In this paper, the authors propose a new approach to the consideration of the friction phenomenon in HEAs and, in particular, dry friction. An equation is obtained that shows the nonlinear dependence of the friction coefficient on Gibbs energy G0, on temperature T, on the concentration of the number of electrons N and which allows predicting the formation of high entropy alloys and coatings.

Tribology research of the turned zirconium-dioxide ceramics

2012 ◽  
Vol 3 (3) ◽  
pp. 181-190
Author(s):  
G. Fledrich ◽  
R. Keresztes ◽  
L. Zsidai
Keyword(s):  
Friction Coefficient ◽  
Friction Force ◽  
Dry Friction ◽  
Zirconium Dioxide ◽  
Steel Specimen ◽  
Friction Condition ◽  
Normal Direction ◽  
Basic Material ◽  
Series Production ◽  
Ceramic Specimen

The zirconium dioxide as basic material is suitable to machine by tool with regular edge derivingfrom lower ceramic hardness and from other characteristics so in case of piece production or small – andmedium series production, at quick prototype production can become potential material alike. The aims tocompare the arising frictional characteristics in case of dry friction condition in case of ceramic – steelsurface pairs machined with different sets. We have developed for an equipment to carry out tribologicaltests. During the test we pressure the steel counter face with determined normal direction force thecasing surface of the rotating ceramic specimen and in the meantime we measure the value of the frictionforce with force meter cell. We have calculated the friction coefficient characterizing the system from thenormal direction force and the friction force as well as we measured the wear of the steel specimen andits deformation.

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