scholarly journals Friction Behavior of a Wet Clutch Subjected to Accelerated Degradation

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Agusmian Partogi Ompusunggu ◽  
Thierry Janssens ◽  
Paul Sas
Keyword(s):  
Sliding Friction ◽  
Test Procedure ◽  
Applied Pressure ◽  
Friction Behavior ◽  
Friction Characteristics ◽  
Test Setup ◽  
Accelerated Degradation ◽  
Pressure Dependency ◽  
Wet Clutch ◽  
Systematic Methodology

This study aims at experimentally investigating the sliding friction characteristics of a wet clutch during its lifetime. More precisely, the objective is to understand how the Stribeck and the frictional lag (i.e, sliding hysteresis) parameters evolve as the clutch degradation progresses. For this purpose, a novel test procedure has been proposed and a set of experiments has been carried out on a fully assembled (commercial) clutch using a modified SAE#2 test setup. Furthermore, a systematic methodology for the Stribeck and the frictional lag parameters identification is developed. Regardless of the applied pressure, it appears that the first three identified Stribeck parameters tend to decrease with the progression of the degradation, while the last parameter tends to increase. In regard to the frictional lag parameter, the trend shows pressure dependency.

Friction Characteristics of Sliding Surfaces Undergoing Subsurface Plastic Flow

1960 ◽  
Vol 82 (2) ◽  
pp. 342-345 ◽  
Author(s):  
Milton C. Shaw ◽  
Abraham Ber ◽  
Pierre A. Mamin
Keyword(s):  
Plastic Flow ◽  
Metal Cutting ◽  
Sliding Friction ◽  
Test Procedure ◽  
Wire Drawing ◽  
Simple Test ◽  
Bulk Metal ◽  
Friction Characteristics ◽  
Sliding Surfaces ◽  
Coefficient Of Sliding Friction

It is well known that the load of an ordinary friction slider is supported by a large number of surface asperities having a collective area that is small compared with the apparent area of contact. The metal in bulk beneath such surface asperities is elastically loaded. In many metalworking operations, such as wire drawing, extruding, rolling, and metal cutting, the bulk metal undergoes plastic deformation as sliding occurs. The influence of this subsurface flow upon the coefficient of sliding friction is discussed. A simple test procedure for studying the friction characteristics of sliding metal surfaces, one of which is being subjected to plastic flow in bulk, is described, and representative data are presented for both dry and lubricated sliding.

scholarly journals Effects of operating and material parameters on the thermal characteristics of a wet clutch

2021 ◽  
Vol 13 (7) ◽  
pp. 168781402110341
Author(s):  
Zhigang Zhang ◽  
Ling Zou ◽  
Hang Liu ◽  
Yonglong Chen ◽  
Benzhu Zhang
Keyword(s):  
Heat Flux ◽  
Applied Pressure ◽  
Thermal Characteristics ◽  
Thermal Models ◽  
Material Parameters ◽  
Heat Transfer Theory ◽  
Friction Disk ◽  
Viscous Shear ◽  
Wet Clutch ◽  
Transient Thermal

Based on the frictional mechanism of a wet clutch, frictional models of wet clutch engagement were established using the modified Reynolds equation and the elastic contact model between frictional pairs. Then, the heat flux models for the viscous shear and asperity friction were built, and the two-dimensional transient thermal models for the separator plate, friction disk, and ATF heat convection model were deduced based on the heat transfer theory and conservation law of energy. Finally, the Runge–Kutta numerical method was used to solve the frictional and thermal models. The average temperature of the separator plate, friction disk, and ATF were calculated. The effects of operating and material parameters, such as applied pressure, initial angular velocity, friction lining permeability, surface combined roughness RMS, equivalent elastic modulus, and ATF flow, on the thermal characteristics of friction pairs and ATF during engagement, were studied. The simulation results show that the temperature characteristics of the separator plate, friction disk, and ATF depend mainly on the viscous shear and asperity friction heat flux, and that the operating and material parameters of the wet clutch also have significant impacts on the overall variation trend of the thermal characteristics of the separator plate, friction disk, and ATF.

Frictional Behavior of Textile Fabrics Part I: Sliding Phenomena of Fabrics on Metallic and Polymeric Solid Surfaces

1997 ◽  
Vol 67 (11) ◽  
pp. 793-802 ◽  
Author(s):  
Luis Virto ◽  
Arun Naik
Keyword(s):  
Sliding Friction ◽  
Solid Material ◽  
Solid Surfaces ◽  
Friction Behavior ◽  
Stick Slip ◽  
Compression Load ◽  
Physical Description ◽  
Frictional Behavior ◽  
Textile Fabrics ◽  
Polymeric Solid

This paper presents experimental results on the sliding of fabrics on metallic and polymeric solid surfaces, showing the influence of the compression load at the solid-fabric interface and the nature of the solid material, and the effect of sliding speed on the sliding friction coefficient. At the same time, a physical description of the sliding phenomenon is given. On the basis of these observations, a theoretical approach is developed to explain the sliding friction behavior of fabrics on solid surfaces. Part II will deal with the waving and stick-slip phenomena, which are evident in the sliding process under certain conditions.

Size Effect of CeO2 Particle On Nanoscale Single-Asperity Sliding Friction

2021 ◽  
Author(s):  
Ning Xu ◽  
Jiahui Ma ◽  
Qi Liu ◽  
Weizhong Han ◽  
Zhiwei Shan
Keyword(s):  
Mechanical Properties ◽  
Size Effect ◽  
Sliding Friction ◽  
Abrasive Particle ◽  
Friction Behavior ◽  
Single Asperity ◽  
Ultra Precision ◽  
Ceo2 Particle ◽  
Cutting Regimes ◽  
Tip Radius

Abstract The size of abrasive particle has a great impact on the fundamental friction behavior and mechanical properties of the abrasive during ultra-precision polishing performance. Here, the size effect of the tribological behavior and mechanical properties of CeO2 single abrasive were studied. Experimental results show that the size effect plays a role on coefficient of friction (COF) of each regime in single-asperity sliding friction, especially in ploughing and cutting regimes. The residual depth of the scratch and COF both decrease with the increase of the CeO2 tip radius. These results relate to the mechanical properties of CeO2 nanoparticles. We found that the effective modulus increases with the decrease of abrasive size, which corresponds to the size effect of the single-asperity sliding friction experiment.

Experimental study on the friction stability of paper-based clutches concerning groove patterns

2019 ◽  
Vol 72 (4) ◽  
pp. 541-548 ◽  
Author(s):  
Liang Yu ◽  
Biao Ma ◽  
Man Chen ◽  
He Yan Li ◽  
Jikai Liu
Keyword(s):  
Experimental Study ◽  
Surface Temperature ◽  
Design Methodology ◽  
Automatic Transmission ◽  
Applied Pressure ◽  
Friction Torque ◽  
Content Type ◽  
Rotating Speed ◽  
Wet Clutch ◽  
Transmission Fluid

Purpose This paper aims to study and compare the friction stability of wet paper-based clutches with regard to the radial grooves (RG) and waffle grooves (WG). Design/methodology/approach This paper presents an experimental study of a wet clutch concerning the effect of groove patterns on the friction torque and surface temperature. The friction stabilities of RG and WG are investigated with the applied pressure, rotating speed and automatic transmission fluid (ATF) temperature taken into consideration. Findings The friction torque and surface temperature of WG are larger than those of RG under the same operating condition. The friction torque difference between RG and WG grows with the increase of applied pressure and narrows with the increase of ATF temperature. Additionally, their temperature difference expands via increasing the rotating speed and ATF temperature or reducing the applied pressure; in this way, not only the variable coefficient difference between RG and WG can be narrowed, but also the friction stability of the clutch can be improved dramatically. Originality/value This paper explains the thermodynamic differences between RG and WG; moreover, it is verified experimentally that WG has a better friction stability than RG.

Sliding Friction Behavior of Bulk Ti3SiC2 under Difference Normal Pressures

2007 ◽  
pp. 1353-1356 ◽  
Author(s):  
Zhen Ying Huang ◽  
Hong Xiang Zhai ◽  
Yang Zhou ◽  
Yi Fan Wang ◽  
Zhi Li Zhang
Keyword(s):  
Sliding Friction ◽  
Friction Behavior

Analysis of Temperature Field on Combining Friction Discs of Wet Clutch

2014 ◽  
Vol 551 ◽  
pp. 399-406
Author(s):  
Jie Li ◽  
Xiao Yan Wang ◽  
Qi Jin ◽  
Jun Zhi Luo ◽  
Liang Hai Yi
Keyword(s):  
Temperature Field ◽  
Sliding Friction ◽  
Axial Direction ◽  
Element Model ◽  
Flow Density ◽  
Heat Flow Density ◽  
Wet Clutch ◽  
Exchange Function ◽  
The Finite Element Model ◽  
Heat Field

Because of overheat and over wear, the distortion and invalidation will be produced easily in combining friction discs of wet clutch of heavy vehicle transmission system. So the paper studies the sliding friction force of a pair of steel and friction disc, calculates the heat flow density, obtains the heat exchange function with axial symmetry, and establishes the finite element model of temperature field. And then the transient heat field simulation is analyzed, and temperature field distribution curves of combining pairs are obtained. Thus the connection is found between time and temperature along radial and axial direction, and temperature field characteristics are obtained with touch press, relative speed, and sliding time.

scholarly journals Cupronickel B10 and YG6 interface friction characteristics tested on a friction device for metal cutting

2019 ◽  
Vol 11 (11) ◽  
pp. 168781401989022
Author(s):  
Chunjian Liu ◽  
Daochun Xu ◽  
Qingqing Li
Keyword(s):  
Friction Coefficient ◽  
Metal Cutting ◽  
Vibration Reduction ◽  
Interface Temperature ◽  
Friction Behavior ◽  
Conduction Model ◽  
Friction Characteristics ◽  
Interface Friction ◽  
Cupronickel B10 ◽  
Solid Liquid

Friction behavior is an important component of the metal-cutting mechanism. A simple and effective friction device that can yield the desired friction characteristics is required. In this article, a friction device with a solid–liquid–gas vibration reduction was proposed to research the interface friction characteristics. The interface friction characteristics of cupronickel B10 and YG6 were obtained through the new friction device, including the friction force, friction temperatures, and friction coefficient. The results show that an experimental solid–liquid–gas vibration reduction is feasible and effective to obtain the interface friction characteristics. The relationship between the friction-interface temperature T2 and the measured-point temperature T1 that was obtained by a heat-conduction model is linear. For cupronickel B10 and YG6, the friction coefficient gradually decreases with an increase in friction speed, and increases initially and then decreases with an increasing load. Based on the effect of friction temperature, friction speed, and load, a friction model for the interface friction characteristics of cupronickel B10 and YG6 was obtained.

Coordinated test-rig and ToF-SIMS experiments to investigate the influence of phosphate glass layers on the friction behavior of a wet clutch

2014 ◽  
Vol 46 (S1) ◽  
pp. 401-404 ◽  
Author(s):  
C. Mayer ◽  
D. Lipinsky ◽  
F. Wohlleber ◽  
H. Pflaum ◽  
K. Stahl ◽  
...  
Keyword(s):  
Phosphate Glass ◽  
Test Rig ◽  
Friction Behavior ◽  
Tof Sims ◽  
Wet Clutch

Wet clutch transmission fluid for AWD differentials: base fluid influence on friction characteristics

Tribotest ◽  
10.1002/tt.4 ◽  
2005 ◽  
Vol 12 (1) ◽  
pp. 47-56 ◽  
Author(s):  
Rikard Mäki ◽  
Bager Ganemi ◽  
Richard Olsson
Keyword(s):  
Base Fluid ◽  
Friction Characteristics ◽  
Wet Clutch ◽  
Transmission Fluid
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