scholarly journals Experimental study of lubrication performance of partially/fully textured surface

2020 ◽  
Vol 1699 ◽  
pp. 012028
Author(s):  
Juan Chen ◽  
Liangcai Zeng ◽  
Min Yang ◽  
Wenting Guo
Keyword(s):  
Experimental Study ◽  
Textured Surface ◽  
Lubrication Performance

Numerical simulation of lubrication performance on chevron textured surface under hydrodynamic lubrication

2021 ◽  
Vol 154 ◽  
pp. 106704
Author(s):  
Zihan Shen ◽  
Fengchao Wang ◽  
Zhiguo Chen ◽  
Xiaopeng Ruan ◽  
Hanghang Zeng ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Hydrodynamic Lubrication ◽  
Textured Surface ◽  
Lubrication Performance

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.

Experimental Study on Anti-Friction Property of Groove Textured Surface with Different Direction Angles

2013 ◽  
Vol 281 ◽  
pp. 404-408 ◽  
Author(s):  
Chen Bo Ma ◽  
Jian Jun Sun ◽  
Hua Zhu ◽  
Jian Quan Li ◽  
Fei Zhou
Keyword(s):  
Experimental Study ◽  
Friction Coefficient ◽  
Smooth Surface ◽  
Combined Effect ◽  
Resistance Force ◽  
Textured Surface ◽  
Friction Property ◽  
Friction Effect ◽  
Direction Angle ◽  
Design And Application

To investigate the influence of different direction angles on groove textured surface, tribology experiments for smooth surface and groove textured surface with angles of 0°, 30°, 45°, 60°, 90° were carried on under various loads and velocities. The results show that, the friction coefficient decreases first and then increases with the increase of groove direction angle. And the optimal anti-friction effect could be obtained when the groove textured surface with angle of 60°, because of its superior combined effect of resistance force and liquid squeeze force, which are introduced by the groove. The findings could provide a theoretical guide for the design and application of groove textured surface.

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.

Experimental Study of Lubricating Property at Grinding Wheel/Workpiece Interface Under NMQL Grinding

2020 ◽  
pp. 275-297
Keyword(s):  
Molecular Structure ◽  
Carbon Nanotubes ◽  
Experimental Study ◽  
Minimum Quantity Lubrication ◽  
High Viscosity ◽  
Lubricating Oil ◽  
Grinding Wheel ◽  
Oxide Nanoparticles ◽  
Lubrication Performance ◽  
Lubricating Property

Nanofluid is the suspension formed by lubricating oil and nanoparticles with particles sizes of 1~100 nm, and common nanoparticles include metal nanoparticles (Cu, Ag, etc.), oxide nanoparticles (Al2O3, SiO2, ZrO2, etc.), carbides (CNT, diamond), and MoS2 nanoparticles, etc. Different nanoparticles exhibit various physicochemical properties (e.g., structure and shape), which can influence their tribological characteristics. In this work, six nanofluids, namely, MoS2, SiO2, diamond, carbon nanotubes (CNTs), Al2O3, and ZrO2, were used as minimum quantity lubrication grinding fluids to select the kind of nanoparticles with optimum lubrication performance in grinding nickel alloy GH4169. Experimental results concluded the following: 1) Nanoparticles with spherical or sphere-like molecular structure and nanofluids with high viscosity demonstrate superior lubrication performances. 2) The polishing effect of nanodiamond particles enhances their surface morphology. 3) The lubricating property of the six nanofluids is described in the following order: ZrO2 < CNTs < ND < MoS2 < SiO2 < Al2O3.

Experimental Study on Lubrication Performance of Slide Bearing with Groove on All Pads

2011 ◽  
Vol 199-200 ◽  
pp. 659-669
Author(s):  
Yong Guo ◽  
Wei Jun Zhao ◽  
Ling Yang ◽  
Xiao Yang Yuan
Keyword(s):  
Experimental Study ◽  
Reynolds Number ◽  
Flow State ◽  
Specific Pressure ◽  
Work Condition ◽  
Number Range ◽  
Lubrication Performance ◽  
Speed Range ◽  
Lubricating Property ◽  
Temperature And Pressure

This paper reports a case of lubricating property test of bearing. In order to seize the performance and the reasonable work condition of Ф480mm elliptical bearing with groove on all pads for 1000MW steam turbine, an experimental method that load is on the rotor was adopted in this paper. And the test focused on the bearing characteristics which is most concerned by designers such as power loses, temperature, flow, and flow state, etc. The influence on power loses, temperature rise, flow by the temperature and pressure of inlet oil, load, speed was studied in this test. The results show that the flow state in this bearing is changed from laminar to turbulent in the speed range 2000rpm~2200rpm and in the Reynolds number range 1325.8~1556.5. The specific pressure for the bearing with groove on the down pad is proper between 1.57MPa and 1.96MPa.

scholarly journals Experimental study of light output power for vertical GaN-based light-emitting diodes with various textured surface and thickness of GaN layer

AIP Advances ◽  
2012 ◽  
Vol 2 (2) ◽  
pp. 022127 ◽  
Author(s):  
Ho-Sang Kwack ◽  
Hyun Soo Lim ◽  
Hyun-Don Song ◽  
Sung-Hoon Jung ◽  
Hyun Kyong Cho ◽  
...  
Keyword(s):  
Experimental Study ◽  
Output Power ◽  
Light Emitting Diodes ◽  
Light Output ◽  
Textured Surface ◽  
Light Output Power ◽  
Light Emitting
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