scholarly journals Frictional Properties of AZ80 and ZE10 Magnesium Alloys Under Dry and Lubricated Contact Conditions

2014 ◽  
Vol 81 ◽  
pp. 1836-1841 ◽  
Author(s):  
Maziar Ramezani ◽  
Thomas Neitzert ◽  
Timotius Pasang ◽  
Miguel Angel Sellès
Keyword(s):  
Magnesium Alloys ◽  
Contact Conditions ◽  
Frictional Properties ◽  
Lubricated Contact

Lubrication of Rough Surfaces by a Boundary Film-Forming Viscosity Modifier Additive

2005 ◽  
Vol 127 (1) ◽  
pp. 223-229 ◽  
Author(s):  
R. P. Glovnea ◽  
A. V. Olver ◽  
H. A. Spikes
Keyword(s):  
Rough Surface ◽  
Rough Surfaces ◽  
Viscosity Index ◽  
Functionalized Polymers ◽  
Contact Conditions ◽  
Film Forming ◽  
Boundary Film ◽  
Surface Contact ◽  
Lubricated Contact ◽  
Rough Surface Contact

In previous work it was shown that some functionalized polymers used as viscosity index improvers are able to form thick boundary lubricating films. This behavior results from adsorption of the polymer on metal surfaces to form a layer of enhanced viscosity adjacent to the surface. In the current work the behavior of one such polymer in rough surface contact conditions is studied, using both model and real rough surfaces. It is found that the polymer is able to form a thick boundary film in rough surface contact, just as it does with smooth surfaces. It is also shown that the effect of this boundary film is to significantly reduce friction in rolling-sliding, rough surface, lubricated contact.

scholarly journals The sliding contact of a rigid wavy surface with a viscoelastic half-space

2014 ◽  
Vol 470 (2169) ◽  
pp. 20140392 ◽  
Author(s):  
N. Menga ◽  
C. Putignano ◽  
G. Carbone ◽  
G. P. Demelio
Keyword(s):  
Half Space ◽  
Applied Load ◽  
Sliding Velocity ◽  
Contact Conditions ◽  
Frictional Properties ◽  
Single Asperity ◽  
Partial Contact ◽  
Pressure Distributions ◽  
Full Contact ◽  
Asperity Contacts

In this paper, the contact of a rigid sinusoid sliding on a viscoelastic half-space is studied. The solution of the problem is obtained by following the path drawn by Hunter for cylindrical contacts. Results show that depending on the remote applied load, a transition from full contact conditions to partial contact may occur depending on the sliding velocity. This effect, which is not observed in smooth single asperity contacts, is related to the viscoelastic stiffening of the material and to the periodicity of the contacts. Frictional properties as well as contact area, displacement and pressure distributions are discussed in detail.

The Wear Mechanism of DLC Films at Variable Working Conditions

2011 ◽  
Vol 199-200 ◽  
pp. 683-688 ◽  
Author(s):  
Chong Liang Chen ◽  
Li Guo Liu ◽  
Zi Feng Ni
Keyword(s):  
Wear Rate ◽  
Working Conditions ◽  
Frictional Coefficient ◽  
Contact Condition ◽  
Contact Conditions ◽  
Frictional Properties ◽  
Full Contact ◽  
Initial Decrease ◽  
Steel Surfaces ◽  
Frictional Coefficients

The Diamond-like carbon coating (DLC) was derived by the PVCD method on the 45 steel surfaces. The frictional properties and fatigue failure of 45 steel with the DLC films were investigated under three different conditions including full contact condition, horizontal reciprocating movements and vertical reciprocating movements. It was found that (a) at full contact conditions: the increase in the load leads to the initial decrease in the frictional coefficient and then increase, and a lowest frictional coefficient of 0.205 appears at 250N; (b) at horizontal reciprocating conditions: the slow decrease in the frictional coefficient was caused by the increase in load, and frictional coefficients of 0.213 and 0.178 appears at 100N and 300N, respectively; (c) at vertical reciprocating conditions: the frictional coefficient was initially enhanced and then followed by a decrease trend; the highest frictional coefficients of 0.640 appears at load of 200N. The wear rate was slightly enhanced as the load is lower than 200N, and was sharply increased with the further increase in the load. The lowest wear rate was 1.55 mg/10000r, and the highest wear rate was 15.6mg/10000r.

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