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 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.

Paper 16: Friction in Wet Clutches

1967 ◽  
Vol 182 (14) ◽  
pp. 132-138 ◽  
Author(s):  
E. M. Evans ◽  
J. Whittle
Keyword(s):  
Coefficient Of Friction ◽  
Power Transmission ◽  
Sliding Speed ◽  
Friction Materials ◽  
Friction Characteristics ◽  
Sliding Surfaces ◽  
Base Oils ◽  
Wet Friction ◽  
Friction Clutch ◽  
The Coefficient Of Friction

This paper is intended to demonstrate that designers of wet clutches for power transmission can obtain the optimum friction characteristics for specific applications by considering the interaction between friction materials and lubricants. A friction clutch plate rig is described and the friction results obtained are presented. It is shown that a wide variation of coefficients of friction and frictional characteristics in wet friction clutches can be obtained by changing the oils and friction materials. In particular the coefficient of friction is dependent upon (1) the oil, (2) the materials of the sliding surfaces, (3) sliding speed, and (4) temperature. It is also shown that the coefficient of friction is affected by ( a) refining treatment given to the oil, ( b) different base oils, and ( c) additives.

Finite Element Analysis of Circular Wedge Connections

2000 ◽  
Author(s):  
Christoph Grossmann ◽  
Oliver Tegel
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Analytic Function ◽  
Sliding Friction ◽  
Power Transmission ◽  
Structural Performance ◽  
Element Analysis ◽  
Coefficient Of Sliding Friction ◽  
The Finite Element Analysis

Abstract In this paper, the finite element analysis of circular wedge connections is described, and conclusions for the performance of the connection are derived. In the foreground of the examinations are stresses and deformations while tightening of the connection. Starting with the general structural performance, the influences on power transmission like slope, number of wedges, coefficient of sliding friction and outer hub diameter are discussed. An analytic function to describe the gap pressure within the tightened joint is introduced and rates to explain the problem of centering of circular wedge connections are shown. Finally two concepts for dimensioning are presented and recommendations for application of this connection are given.

Sign in / Sign up

Export Citation Format

Share Document