Abstract
Finite element analysis is used to investigate an elastic-plastic coated spherical contact in full stick contact condition under combined normal and tangential loading. Sliding inception is associated with a loss of tangential stiffness. The effect of coating thickness on the static friction coefficient is intensively investigated for the case of hard coatings. For this case, with the increase in coating thickness, the static friction coefficient first increases to its maximum value at a certain coating thickness, thereafter decreases, and eventually levels off. The effect of the normal load and material properties on this behavior is discussed. Finally, a model for the static friction coefficient as a function of the coating thickness is provided for a wide range of material properties and normal loading.
Highlights
The selection of some important parameters, such as coating thickness and coating material, in coating applications still mainly relies on empiricism [9]
With fixed Esu and R, the material and geometric properties of a coated sphere can be determined by four dimensionless parameters Eco/Esu, Eco/Yco, Esu/Ysu, and till reaching a maximum m at (t/R), where subscripts ‘co’ and ‘su’ indicate the coating and substrate material, respectively
The present study was conducted with fixed Esu=200 GPa and R=10 mm and the results were verified to be independent of Esu and R as long as Eco/Esu, Eco/Yco, Esu/Ysu, and t/R and the dimensionless normal load were fixed
Summary
On one hand, it can be desirable in some cases such as a braking system [1] and power transmission system [2, 3]. It may not be favored as high friction can lead to severe material wear [4] and undesirable energy consumption [5]. Proper control of friction is an essential goal for the surface engineering community. Coating technology has been widely used in the industry and has been proven to be one of the most effective surface treatments to control the surface friction property [6−8]. A generic scientific theory is required so that the surface properties can be tailored precisely with less trial and error
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