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Tribology Letters

, Volume 56, Issue 3, pp 491–500 | Cite as

Experimental Investigation of Lubrication Film Starvation of Polyalphaolefin Oil at High Speeds

  • He Liang
  • Dan Guo
  • Jianbin Luo
Original Paper

Abstract

The lubrication behavior of starved elastohydrodynamic contacts at high speeds was investigated in this study. A new ball-on-disc test rig with the ability to measure traction force at high speeds up to 100 m/s and lubrication film thickness at speeds up to 42 m/s was built. The relative optical interference intensity technique was used to measure the film thickness. The experimental results show that the film thickness decreased rapidly and asymmetrically when the speed exceeded a critical speed under the starved lubrication condition. Starvation is governed by the amount of lubricant available both in the inlet region and on the side of the oil reservoir. The shape of the oil reservoir becomes asymmetric and the amount of oil gradually reduces against the speed at high speeds because of the centrifugal effects, under which the oil on the outer side of the oil reservoir will be thrown away and the oil on the inner side of the oil reservoir will be compressed. The balance of oil supply and oil loss due to centrifugal force determines the starvation behavior.

Keywords

High speeds Elastohydrodynamic lubrication Pure rolling Starvation Centrifugal force 

List of Symbols

λ

Wave length of the incident light

k

Reflective index of the lubricant

n

Interference order

I

Light intensity

Imax, Imin

Maximum or minimum interference light intensity

\(\bar{I}\)

Relative interference light intensity \(\bar{I} = (2I - I_{\hbox{max} } - I_{\hbox{min} } )/(I_{\hbox{max} } - I_{\hbox{min} } )\)

\(\bar{I}_{0}\)

Relative light intensity when the lubricant film thickness is zero

h

Lubricant film thickness (m)

hc

The central film thickness (m)

hmin

The minimum film thickness (m)

E

Reduced modulus (Pa)

t0

Operating temperature (K)

η0

Ambient viscosity (Pa s)

u

Lubricant entrainment speed, u = (u 1 + u 2)/2

u1, u2

Surface velocities of disc and ball (m/s)

pH

Maximum Herzian pressure (Pa)

w

Load (N)

Notes

Acknowledgments

The work was financially supported by the National Natural Science Foundation of China (51335005, 51375255, 51321092), the International Science & Technology Cooperation Project (No. 2011DFA70980) and National Key Basic Research Program of China (No. 2014CB046404).

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.State Key Laboratory of TribologyTsinghua UniversityBeijingChina

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