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Hydrodynamic Lubrication

Performance, Characterization and Design of Textured Surfaces

[+] Author and Article Information
B. Podgornik1

 Institute of Metals and Technology, Lepi pot 11, SI-1000 Ljubljana, Sloveniabojan.podgornik@imt.si

M. Sedlacek

 University of Ljubljana, Ljubljana, Centre for Tribology and Technical Diagnostics, Bogišičeva 8, SI-1000 Ljubljana, Slovenia

1

Corresponding author.

J. Tribol 134(4), 041701 (Aug 21, 2012) (7 pages) doi:10.1115/1.4007108 History: Received December 24, 2011; Revised April 17, 2012; Published August 21, 2012; Online August 21, 2012

In recent years the efforts to better control friction and wear have focused on surface-topography modification through surface texturing. Although a lot of effort, including experimental and analytical work, has been put into finding the optimal texturing parameters and design rules for reduced friction, optimization is still too often limited and based on a trial-and-error approach. Therefore, the aim of the present research work was to investigate the possibility of using kurtosis and skewness as the design parameters for selecting the optimal texturing pattern for contact surfaces operating under lubricated conditions. The results of this investigation performed on groove- and dimple-textured surfaces under low-load, low-sliding speed conditions confirmed the correlation between the kurtosis and skewness parameters and the coefficient of friction. For textured surfaces an increase in the kurtosis and a more negative skewness, obtained by reducing the cavity size, increasing the cavity depth and decreasing the texturing density, were found to yield a lower friction. Furthermore, kurtosis and skewness were recognized as suitable parameters for the optimization of textured surfaces.

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Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Virtually textured profile

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Figure 2

Example of laser textured surfaces with (a) grooves (G2-2) and (b) dimples (D2-2)

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Figure 3

Tribological test setup configuration

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Figure 4

Tribological testing of textured specimens (a) grooves and (b) dimples

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Figure 5

Example of steady-state coefficient of friction determination: specimen G3-2

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Figure 6

Effect of (a) cavity width and (b) spacing between the cavities on kurtosis and skewness

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Figure 7

Influence of (a) reduced measurement area and (b) increased distance between profiles on the kurtosis and skewness values for a dimple-textured surface

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Figure 8

Effect of the measurement direction on (a) kurtosis and (b) skewness for a dimple-textured surface

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Figure 9

Steady-state coefficient of friction for specimens with grooves: (a) effect of spacing between the grooves and (b) effect of the groove width

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Figure 10

Influence of dimple depth and density on the steady-state coefficient of friction; vs  = 0.2 m/s

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Figure 12

Correlation between kurtosis and skewness and coefficient of friction for surfaces with (a) grooves and (b) dimples

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Figure 11

Effect of sliding direction on the coefficient of friction for a dimple depth of 11 μm; vs  = 0.2 m/s

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