Research Papers: Elastohydrodynamic Lubrication

Transient Elastohydrodynamic Lubrication Film Thickness During Normal Approach Considering Shear-Thinning and Linear Piezoviscous Oils

[+] Author and Article Information
Punit Kumar

Department of Mechanical Engineering,
National Institute of Technology Kurukshetra,
Haryana 136119, India
e-mail: punkum2002@yahoo.co.in

Tapash Jyoti Kalita

Department of Mechanical Engineering,
National Institute of Technology Kurukshetra,
Haryana 136119, India
e-mail: tapashjyoti@gmail.com

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received August 3, 2014; final manuscript received January 21, 2015; published online February 12, 2015. Assoc. Editor: Dong Zhu.

J. Tribol 137(2), 021504 (Apr 01, 2015) (7 pages) Paper No: TRIB-14-1193; doi: 10.1115/1.4029673 History: Received August 03, 2014; Revised January 21, 2015; Online February 12, 2015

Transient film thickness behavior is investigated using full elastohydrodynamic lubrication (EHL) line contact simulations during film collapse due to sudden halt and impact loading. Due attention is given to realistic shear-thinning behavior and comparisons are made with a largely ignored class of EHL lubricants that exhibit linear pressure–viscosity dependence at low pressures. The EHL film collapse is found to be governed by the piezoviscous response and the linear P–V oils exhibit rapidly collapsing EHL entrapment. Under impact loading, the transient film thickness deviates markedly from the corresponding steady-state behavior and this departure is a function of lubricant rheology.

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Grahic Jump Location
Fig. 1

Collapsing film profiles pertaining to (a) mineral oil (uo = 0.1 m/s), (b) PAO (uo = 0.017 m/s), (c) LPVO-1 (uo = 2.9 m/s), and (d) LPVO-2 (uo = 2.1 m/s)

Grahic Jump Location
Fig. 2

Comparison of percentage reduction in central film thickness with respect to time for four test lubricants

Grahic Jump Location
Fig. 3

Effect of initial film thickness on film collapse characteristics pertaining to lubricants with linear pressure–viscosity response—LPVO-1 and LPVO-2

Grahic Jump Location
Fig. 4

Variation of instantaneous to nominal load ratio and maximum Hertzian pressure with time

Grahic Jump Location
Fig. 5

Variation of (a) minimum film thickness and (b) central film thickness over a loading cycle at uo = 0.1 m/s for mineral oil

Grahic Jump Location
Fig. 6

Variation of (a) minimum film thickness and (b) central film thickness over a loading cycle at uo = 0.1 m/s for PAO

Grahic Jump Location
Fig. 7

Variation of (a) minimum film thickness and (b) central film thickness over a loading cycle at uo = 0.1 m/s for LPVO-3




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