scholarly journals Study on Friction and Lubrication Characteristics of Surface with Unidirectional Convergence Texture

Coatings ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 780 ◽  
Author(s):  
Chenchen Li ◽  
Xuefeng Yang ◽  
Shouren Wang ◽  
Yanjun Wang ◽  
Chongyang Lu ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Abrasive Wear ◽  
Simulation Analysis ◽  
Dynamic Pressure ◽  
Contact Fatigue ◽  
Hydrodynamic Pressure ◽  
Surface Friction ◽  
Textured Surface ◽  
Fatigue Wear ◽  
Lubrication Performance

In order to study the influence of texture on the wear and lubrication performance of the surface of the tools, three kinds of textures with unidirectional convergence morphology were processed on the surface of the samples, and each texture was designed with different area occupancy ratios. Simulation analysis shows that, owing to the reflow and convection effect of liquid in the texture, the lubricating film flowing through the textured surface has a high hydrodynamic pressure value, and the semicircular ring texture is the most prominent. By comparing the friction coefficient, when the area occupancy ratio of texture on the surface is 10%, the surface of the samples with different morphology has the lowest coefficient of friction; the friction coefficient of the semicircular ring textured surface is especially very low. Surface textures reduce the direct contact area between the friction pairs, and generate dynamic pressure lubrication and secondary lubrication, so that the surface friction coefficient of the samples is obviously reduced. The surfaces of the non-textured samples have abrasive wear and contact fatigue wear, and the surfaces of the textured samples have adhesive wear, abrasive wear, and cavitation.

scholarly journals Dry Rolling/Sliding Wear of Bainitic Rail Steels under Different Contact Stresses and Slip Ratios

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4678
Author(s):  
Jiapeng Liu ◽  
Yingqi Li ◽  
Yinhua Zhang ◽  
Yue Hu ◽  
Lubing Shi ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Abrasive Wear ◽  
Contact Stress ◽  
Wear Mechanism ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Wear Loss ◽  
Fatigue Wear ◽  
Slip Ratio

This study aims to deeply understand the effect of contact stress and slip ratio on wear performances of bainitic rail steels. The results showed that the wear loss increased as the contact stress and slip ratio increased. Based on the surface damage morphology and microstructural analyses, it revealed that the rolling contact fatigue wear mechanism played a significant role under the low slip ratio, but the dominant wear mechanism transferred to the abrasive wear at the high slip ratio. Meanwhile, the bainitic steel specifically presented worse wear resistance under the abrasive wear mode. Compared with the influence of a slip ratio, the increase in contact stress led to severer plastic flows and contributed to the propagation of cracks. In addition, the contact stress and slip ratio had the opposite effect on the friction coefficient, that is, the friction coefficient of bainitic steels behaved the inverse proportion with the contact stress, but positive proportion with the slip ratio. At last, the increase in slip ratio had more significant effect on the reduction of retained austenite (RA) than the enlargement of contact stress due to the fact that the RA would probably be removed before the martensitic transformation occurred under the abrasive wear mechanism.

scholarly journals Comparative Study on the Friction Property of Bearing Steel Modified Bygraphite/MoS2 Composite Coating and Manganese Phosphate Coating

2019 ◽  
Vol 25 (4) ◽  
pp. 383-393 ◽  
Author(s):  
Libin ZANG ◽  
Yong CHEN ◽  
Lixin RAN ◽  
Yang ZHENG ◽  
Kai LI ◽  
...  
Keyword(s):  
Surface Modification ◽  
Tribological Properties ◽  
High Performance ◽  
Contact Fatigue ◽  
Bearing Steel ◽  
Phosphate Coating ◽  
Wear Properties ◽  
Fatigue Wear ◽  
Manganese Phosphate ◽  
Lubrication Performance

Surface modification is an important method to improve the contact fatigue life of transmission parts. The preparation of high performance coating with good tribological properties on the gears and bearings has become the research trends. This paper presents graphite/MoS2 composite spray and manganese phosphate conversion coating prepared on the AISI52100 steel surface and investigates their anti-fatigue mechanism. The tribological properties of the modified layers were studied using a SRV-IV multifunctional friction and wear tester. The microstructure and interfacial components of the coating and wear surfaces were analyzed by SEM and EDS, respectively. The surface morphology and phase composition of the coating were evaluated through laser 3D microscopy and XRD analyses, respectively. Both modified layers showed good anti-friction and anti-wear properties. The friction coefficients of the surfaces modified by manganese phosphate coating and graphite/MoS2 decreased by 7 % and 14 %, respectively, and the corresponding extreme pressure properties increased by 11 % and 55 %, respectively. But the mechanism of anti-fatigue wear and the corresponding interfacial phenomena of the surface modification of the graphite/MoS2 composite spraying layer is different from those of manganese phosphate coating. The hard-ceramic particles with graphite and MoS2 are sprayed on the substrate to obtain the surface hardening layer, resulting in higher wear resistance. The graphite and MoS2 modified layer can greatly reduce the friction coefficient and improve the lubrication performance on the surface. Manganese phosphate coating serves as a chemical soft coating and is filled with rough corrugated caused by surface processing, which induces an ideal meshing surface after initial friction phase. The obtained hole-shaped structure and "infiltration" role contribute to the storage of lubricants and thus improves the lubrication performance.

A Research on Friction Properties of Concave Laser-Textured Surface

2012 ◽  
Vol 184-185 ◽  
pp. 33-36
Author(s):  
Hua Qi Liang ◽  
Hui Fang Kong ◽  
Gen Fu Yuan
Keyword(s):  
Friction Coefficient ◽  
Nd:Yag Laser ◽  
Steel Surface ◽  
Surface Friction ◽  
Concave Surface ◽  
Textured Surface ◽  
Textured Surfaces ◽  
Friction Property ◽  
Fine Surface ◽  
Test Result

An object’s fine surface can change the object's surface friction property. So this paper aims to study the friction property of concave laser-textured surface through experiment. First, the Nd:YAG laser is used to generate micro-pores on Cr12 steel surface in the research and then its impact on object's surface friction property is studied. The test result shows that compared with the non-textured surfaces, the concave surface with area density of 5% and depth of I10.8 can reduce the friction coefficient significantly.

scholarly journals Surface Texturing Technique Based on Ultrasonic Turning for Improving Tribological Properties

2022 ◽  
Vol 16 (1) ◽  
pp. 78-86
Author(s):  
Keisuke Hara ◽  
Toshihiro Fukuda ◽  
Kyosuke Taguchi ◽  
Hiromi Isobe ◽  
◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Tribological Properties ◽  
Radial Direction ◽  
Principal Direction ◽  
Surface Texturing ◽  
Target Surface ◽  
Textured Surface ◽  
Rotation Direction ◽  
Lubrication Performance ◽  
Efficiency Performance

Tribological properties such as lubrication, friction, and wear resistance greatly affect machine operation efficiency, performance, and service life. Surface texturing methods such as scraping can be used to improve these properties. Scraping creates many small depressions on the target surface. These depressions, which are evenly distributed, function as oil holes and thus improve lubrication performance. This paper describes a surface texturing technique based on ultrasonic vibration-assisted turning (UVAT) that simultaneously improves tribological properties and machinability. In UVAT, the cutting tool is oscillated mainly in the principal direction. Vibration in the radial direction, which is induced by Poisson deformation, periodically digs up or pushes the workpiece surface in the radial direction, creating a textured surface. A surface subjected to UVAT has periodic depressions along the workpiece rotation direction. The texturing rate of UVAT is up to 6700 mm2/min, which is higher than that of manual scraping. To evaluate the tribological performance of a surface textured by UVAT, the friction coefficient between a stainless steel pin and the surface was measured under oil dipping conditions. The results of friction experiments show that the friction coefficient of the UVAT-treated surface and its fluctuation were lower than those of a conventional turned surface. The UVAT-treated surface had stable friction properties.

Numerical Investigation on the Mixed Lubrication Performance of Water-Lubricated Coupled Journal and Thrust Bearings

2019 ◽  
Author(s):  
Yanfeng Han ◽  
Guo Xiang ◽  
Jiaxu Wang
Keyword(s):  
Friction Coefficient ◽  
Film Thickness ◽  
Thrust Bearing ◽  
Journal Bearing ◽  
Load Capacity ◽  
Hydrodynamic Pressure ◽  
Mixed Lubrication ◽  
Eccentricity Ratio ◽  
Thrust Bearings ◽  
Lubrication Performance

Abstract The mixed lubrication performance of water-lubricated coupled journal and thrust bearing (simplified as coupled bearing) is investigated by a developed numerical model. To ensure the continuity of hydrodynamic pressure and flow at the common boundary between the journal and thrust bearing, the conformal transformation is introduced to unify the solution domain of the Reynolds equation. In the presented study, the coupled effects between the journal and thrust bearing are discussed. The effects of the thrust bearing geometric film thickness on the mixed lubrication performance, including the load capacity, contact load and friction coefficient, of the journal bearing are investigated. And the effects of the journal bearing eccentricity ratio on the mixed lubrication performance of the thrust bearing are also investigated. The simulated results indicate the mutual effects between the journal and thrust bearing cannot be ignored in the coupled bearing system. The increasing thrust bearing geometric film thickness generates a decrease in load capacity of journal bearing. There exists an optimal eccentricity ratio of journal bearing that yields the minimum friction coefficient of the thrust bearing.

Influence of Cutting Parameters on Frictional Coefficient of Micro-Textured Tool

2016 ◽  
Vol 693 ◽  
pp. 807-812
Author(s):  
Hong Yun Chen ◽  
Hai Dong Yang ◽  
Zheng Ye ◽  
Ning Ding
Keyword(s):  
Friction Coefficient ◽  
Feed Rate ◽  
Cutting Tools ◽  
Frictional Coefficient ◽  
Surface Friction ◽  
Cutting Parameters ◽  
Textured Surface ◽  
Best Value ◽  
Cemented Carbide Tools ◽  
Better Than

Micro-textured technology which studies in the field of tribology shows that micro-textured surface can effectively improve the situation of friction between the friction interfaces. In this article, micro-textured surface technology has been applied to the cutting tools, in order to study the cutting mechanism of micro-textured carbide tools. The effect of cutting parameters on surface friction characteristics was studied when cutting 45 steel with YT15 cemented carbide tools. The results shown that all surface friction coefficient of the samples got the best value when the feed rate is 0.14mm/r; an appropriate increasing in feed rate can reduce the surface friction coefficient in the low-speed cutting. Throughout the course of the test, the average of the surface friction coefficient of the 4th and the 5th sample tools are better than other tools.

A study on the wear behavior of tin-based journal bearing under different working conditions

2019 ◽  
Vol 72 (3) ◽  
pp. 359-368
Author(s):  
Hulin Li ◽  
Zhongwei Yin ◽  
Yanzhen Wang
Keyword(s):  
Friction Coefficient ◽  
Abrasive Wear ◽  
Working Conditions ◽  
Wear Mechanisms ◽  
Journal Bearing ◽  
Journal Bearings ◽  
Operating Conditions ◽  
Wear Loss ◽  
Fatigue Wear ◽  
Content Type

Purpose The purpose of this paper is to study the friction and wear properties of journal bearings under different working conditions. Design/methodology/approach Friction coefficient and wear losses of journal bearing under different working conditions have been determined by a bearing test rig. The worn surfaces of bearing were examined by scanning electron microscopy and laser three-dimensional micro-imaging profile measurements, and the tribological behavior and wear mechanisms were investigated. Findings The wear loss and friction coefficient of bearing under starting-stopping working condition is far greater than that of steady-state working conditions. In addition, the maximum wear loss under start-up and stop conditions is about 120 times of that under stable operating conditions. Under stable working conditions, the main wear forms of bearings are abrasive wear, under starting-stopping working conditions the main wear mechanisms of bearings are adhesion wear, abrasive wear and fatigue wear. Originality/value These research results have certain practical value for understanding the tribology behavior of journal bearings under different working conditions.

Research on the Friction and Wear Properties of the NBR under Dry Sliding and Water Lubrication

2013 ◽  
Vol 420 ◽  
pp. 234-239
Author(s):  
Feng Yan Yang ◽  
Shi Jie Wang ◽  
Xiao Ren Lv
Keyword(s):  
Friction Coefficient ◽  
Abrasive Wear ◽  
Coefficient Of Friction ◽  
Testing Machine ◽  
Water Lubrication ◽  
Wear Testing ◽  
Wear Loss ◽  
Dry Sliding ◽  
Wear Properties ◽  
Lubrication Performance

The wear mechanisms of different graphite contents of NBR by 45# steel under dry sliding and water lubrication were investigated. On MPV-600 computer-controlled abrasive wear testing machine, the coefficients of friction were measured continuously. Results showed that under dry sliding condition, the rubber wear loss is big, the coefficient of friction is higher, the temperature of the friction surface is rise obviously. Wear loss and friction coefficient of NBR decrease with the increase of graphite contents; With the increase of graphite contents wear loss and the friction coefficient decreases, and is mainly due to the graphite lubrication performance and increase the stiffness of the rubber contact area. At low content of graphite, adhesive wear of NBR is showed, in the high content of graphite, abrasive wear is showed. Water lubrication condition, wear surface level off, the wear loss is very small, and the lubrication and cooling effect of water makes the friction coefficient decrease. Graphite content is higher, the wear loss and coefficient of friction is smaller.

Tribological characterization of all-polymer prosthesis based on multi-directional motion

2021 ◽  
pp. 089270572110286
Author(s):  
Xinyue Zhang ◽  
Dekun Zhang ◽  
Kai Chen ◽  
Handong Xu ◽  
Cunao Feng
Keyword(s):  
Friction Coefficient ◽  
Abrasive Wear ◽  
Wear Mechanism ◽  
Friction And Wear ◽  
Quantitative Relationship ◽  
Motion Path ◽  
Aspect Ratios ◽  
Directional Motion ◽  
Motion Paths ◽  
Prosthesis Material

The complex movement of artificial joints is closely related to the wear mechanism of the prosthesis material, especially for the polymer prosthesis, which is sensitive to motion paths. In this paper, the “soft-soft” all-polymer of XLPE/PEEK are selected to study the influence of motion paths on the friction and wear performance. Based on the periodic characteristics of friction coefficient and wear morphology, this paper reveals the friction and wear mechanism of XLPE/peek under multi-directional motion path, and obtains the quantitative relationship between friction coefficient and the aspect ratios of “∞”-shape motion path, which is of great significance to reveal and analyze the wear mechanism of “soft” all-polymer under multi-directional motion path. The results show that the friction coefficient is affected by the motion paths and have periodicity. Morever, under the multi-directional motion paths, the wear of PEEK are mainly abrasive wear and adhesive wear due to the cross shear effect, while the wear of XLPE is mainly abrasive wear with plastic accumulation. In addition, the friction coefficient is greatly affected the aspect ratios Rs-l of “∞”-shape and loads. Meanwhile, the wear morphologies are greatly affected by the aspect ratios Rs-l of “∞”-shape, but less affected by loads.

Abrasive wear response of Al-Si–SiCp composite: Effect of friction heat and friction coefficient

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Raj Kumar Singh ◽  
Amit Telang ◽  
Satyabrata Das
Keyword(s):  
Heat Treatment ◽  
Friction Coefficient ◽  
Abrasive Wear ◽  
Applied Load ◽  
Frictional Heating ◽  
Matrix Alloy ◽  
Composite Effect ◽  
Friction Heat ◽  
Wear Response ◽  
Abrasive Size

Abstract The effects of friction heat and friction coefficient on the abrasive wear response of Al-7.5Si–SiCp composite against low-cost hypereutectic (Al-17.5Si) alloy were investigated as functions of the abrasive size and applied load in both as-cast and after heat-treatment conditions. Experiments were performed on pin-on-disc apparatus at 38 –80 μm abrasive size, 5 – 20 N applied load, 100 –400 m abrading (sliding) distances and 1 m s–1 constant sliding speed. The frictional heating of as-cast and heat-treated composite was superior compared to the matrix alloy and hypereutectic alloy, whereas the trend reversed for the friction coefficient. The frictional heating and friction coefficient of the materials increased with the abrasive size and applied load in both as-cast and after heat-treatment. The worn surface and wear debris particles were examined by using field emission scanning electron microscopy to understand the wear mechanism.

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