scholarly journals Discussion: “Friction Characteristics of Sliding Surfaces Undergoing Subsurface Plastic Flow” (Shaw, Milton C., Ber, Abraham, and Mamin, Pierre A., 1960, ASME J. Basic Eng., 82, pp. 342–345)

1960 ◽  
Vol 82 (2) ◽  
pp. 345-346
Author(s):  
Edmond E. Bisson
Keyword(s):  
Plastic Flow ◽  
Friction Characteristics ◽  
Sliding Surfaces

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.

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.

The Conflicting Roles of Carbontetrachloride as a Boundary Lubricant

1978 ◽  
Vol 100 (2) ◽  
pp. 244-248 ◽  
Author(s):  
T. Shirakashi ◽  
R. Komanduri ◽  
M. C. Shaw
Keyword(s):  
Beneficial Effect ◽  
Plastic Flow ◽  
Coefficient Of Friction ◽  
Shear Stresses ◽  
Low Speed ◽  
Sliding Surfaces ◽  
Boundary Lubricant ◽  
Normal And Shear Stresses

Under certain conditions, carbontetrachloride is found to be a negative boundary lubricant (gives a higher coefficient of friction than that of dry surfaces in air), while under other conditions, it lowers friction and gives a beneficial effect. Both of these situations are illustrated for heavily loaded sliding surfaces where the subsurface is undergoing gross plastic flow and an explanation is presented which appears to be consistent with all experimental facts. Carbontetrachloride is found to be more reactive chemically when the sliding surfaces are heavily strained or galled under high normal and shear stresses and containing microcracks, a situation that arises when cutting at low speed.

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