A Fundamental Study on Sliding Friction

1990 ◽  
Vol 18 (2) ◽  
pp. 104-115 ◽  
Author(s):  
N. Purushothaman ◽  
J. T. Tielking
Keyword(s):  
Experimental Investigation ◽  
Sliding Friction ◽  
Test Machine ◽  
Friction Test ◽  
Fundamental Study ◽  
Surface Samples ◽  
Friction Tester ◽  
Test Parameters ◽  
Contact Pressures ◽  
Tread Rubber

Abstract In this paper we report on an experimental investigation on the friction of tire tread sections sliding over a variety of surfaces. The Texas A&M friction tester was used to measure sliding friction at various speeds and contact pressures. The friction test machine is also described. Actual bituminous and concrete road pavements and artificial 3M Safety Walk were used as surface samples. Tread rubber sections taken from passenger car, truck, and aircraft tires were tested. The influence of major test parameters such as sliding speed, surface texture and contact pressure on friction are discussed.

Tribological Properties of TiN/DLC Nanocomposite Coatings

2006 ◽  
Vol 317-318 ◽  
pp. 385-388
Author(s):  
Won Jae Yang ◽  
Tohru Sekino ◽  
Jong Won Yoon ◽  
Kwang Bo Shim ◽  
Koichi Niihara ◽  
...  
Keyword(s):  
Friction And Wear ◽  
Sliding Friction ◽  
Tribological Behavior ◽  
Chemical Vapor ◽  
Nanocomposite Coatings ◽  
High Wear Resistance ◽  
Friction Test ◽  
Low Friction ◽  
Test Parameters ◽  
Flat Type

The TiN/DLC nanocomposite coatings were grown on Si wafers using Ar/CH4/TDMAT (Ti[(CH3)2N]4N2) gas mixtures by r.f. plasma enhanced chemical vapor deposition. The sliding friction tests were carried out using a ball-on-flat type tribometer. The different test parameters such as applied loads, counterpart materials and environment were applied to understand the tribological behavior in terms of friction and wear. The coatings provided a low friction coefficient and high wear resistance depending on the friction test conditions.

Contact Analysis of Tire Tread Rubber on Flat Surface with Microscopic Roughness3

2006 ◽  
Vol 34 (4) ◽  
pp. 237-255 ◽  
Author(s):  
M. Kuwajima ◽  
M. Koishi ◽  
J. Sugimura
Keyword(s):  
Surface Roughness ◽  
Finite Element ◽  
Sliding Friction ◽  
Tangential Force ◽  
Partial Slip ◽  
Real Contact Area ◽  
Element Analysis ◽  
Real Contact ◽  
Local Slip ◽  
Tread Rubber

Abstract This paper describes experimental and analytical studies of the dependence of tire friction on the surface roughness of pavement. Abrasive papers were adopted as representative of the microscopic surface roughness of pavement surfaces. The rolling∕sliding friction of tire tread rubber against these abrasive papers were measured at low slip velocities. Experimental results indicated that rolling∕sliding frictional characteristics depended on the surface roughness. In order to examine the interfacial phenomena between rubber and the abrasive papers, real contact length, partial slip, and apparent friction coefficient under vertical load and tangential force were analyzed with two-dimensional explicit finite element analysis in which slip-velocity-dependent frictional coefficients were considered. Finite element method results indicated that the sum of real contact area and local partial slip were larger for finer surfaces under the same normal and tangential forces. In addition, the velocity-dependent friction enhanced local slip, where the dependence of local slip on surface roughness was pronounced. It proved that rolling∕sliding friction at low slip ratio was affected by local frictional behavior at microslip regions at asperity contacts.

Experimental Investigation of aluminum doping crumb rubber/epoxy composite in reciprocating motion

2015 ◽  
Vol 3 ◽  
pp. 1
Author(s):  
Goutam Chandra Karar ◽  
Nipu Modak
Keyword(s):  
Experimental Investigation ◽  
Coefficient Of Friction ◽  
Epoxy Composite ◽  
Normal Load ◽  
Crumb Rubber ◽  
The Other ◽  
Reciprocating Motion ◽  
Molding Process ◽  
Friction Tester ◽  
The Coefficient Of Friction

The experimental investigation of reciprocating motion between the aluminum doped crumb rubber /epoxy composite and the steel ball has been carried out under Reciprocating Friction Tester, TR-282 to study the wear and coefficient of frictions using different normal loads (0.4Kg, 0.7Kgand1Kg), differentfrequencies (10Hz, 25Hz and 40Hz).The wear is a function of normal load, reciprocating frequency, reciprocating duration and the composition of the material. The percentage of aluminum presents in the composite changesbut the other components remain the same.The four types of composites are fabricated by compression molding process having 0%, 10%, 20% and 30% Al. The effect of different parameters such as normal load, reciprocating frequency and percentage of aluminum has been studied. It is observed that the wear and coefficient of friction is influenced by the parameters. The tendency of wear goes on decreasing with the increase of normal load and it is minimum for a composite having 10%aluminum at a normal load of 0.7Kg and then goes on increasing at higher loads for all types of composite due to the adhesive nature of the composite. The coefficient of friction goes on decreasing with increasing normal loads due to the formation of thin film as an effect of heat generation with normal load.

Synergistic Effects of MoDTC and Overbased Calcium Sulfonate Additive

2013 ◽  
Vol 651 ◽  
pp. 73-76 ◽  
Author(s):  
Zhao Zhou ◽  
Yan Qiu Xia ◽  
Xiang Yu Ge
Keyword(s):  
Sliding Friction ◽  
Synergistic Effects ◽  
Tribological Performance ◽  
Wear Properties ◽  
Sulfonate Additive ◽  
Alkyl Benzene ◽  
Friction Tester ◽  
Calcium Sulfonate ◽  
Alpha Olefin ◽  
Pure Poly

The synergetic effects of molybdenum dialkyldithiocarbamate (MoDTC) and overbased liner alkyl benzene synthetic calcium sulfonate (OBCaS) on the tribological performance of lubricant were investigated using reciprocating ball-on-disk sliding friction tester. The results showed that the two kinds of additives with a certain range of concent ration could improve tribological properties of alone MoDTC. The mass percent of 0.5% MoDTC and 2% OBCaS in pure poly-alpha-olefin (PAO) has the best friction reducing and anti-wear properties.

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