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Research Papers: Elastohydrodynamic Lubrication

Effect of Kinematic Operating Conditions on Ridge Deformation—Numerical Study With Experimental Comparison

[+] Author and Article Information
Ildikó Ficza

Assistant Professor
Faculty of Mechanical Engineering,
Brno University of Technology,
Technicka 2896/2,
Brno 616 69, Czech Republic
e-mail: ficza@fme.vutbr.cz

Petr Šperka

Assistant Professor
Faculty of Mechanical Engineering,
Brno University of Technology,
Technicka 2896/2,
Brno 616 69, Czech Republic
e-mail: sperka@fme.vutbr.cz

Ivan Křupka

Professor
Faculty of Mechanical Engineering,
Brno University of Technology,
Technicka 2896/2,
Brno 616 69, Czech Republic
e-mail: krupka@fme.vutbr.cz

Martin Hartl

Professor
Faculty of Mechanical Engineering,
Brno University of Technology,
Technicka 2896/2,
Brno 616 69, Czech Republic
e-mail: hartl@fme.vutbr.cz

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received November 10, 2015; final manuscript received August 23, 2016; published online November 30, 2016. Assoc. Editor: Ning Ren.

J. Tribol 139(3), 031502 (Nov 30, 2016) (9 pages) Paper No: TRIB-15-1403; doi: 10.1115/1.4034764 History: Received November 10, 2015; Revised August 23, 2016

The behavior of roughness features under rolling–sliding inside highly loaded elastohydrodynamically lubricated (EHL) contacts is studied in detail for many years now. In particular, the roughness deformation was subject to different theoretical analyses as well as experiments. A recent experimental work developed by Šperka et al. (2016, “Experimental Study of Roughness Effects in a Rolling–Sliding EHL Contact—Part I: Roughness Deformation,” Tribol. Trans., 59(2), pp. 267–276) studied the effect of kinematic operating conditions (mean velocity and slide to roll ratio) on the deformed profile of a ridge. The current paper presents results of full numerical simulations and their direct comparison to experiments in order to study the dependency of roughness deformation on the operating conditions. The assumption of non-Newtonian lubricant behavior seems to have a significant influence on the results as well. Results indicate that, in agreement with experiments, the variation of mean velocity causes changes in the deformed profiles of roughness while, on the other hand, the magnitude of slide to roll ratio (for sliding larger than ±50%) does not have influence on the size of the deformation.

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References

Figures

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Fig. 1

Experimental and numerical flat-top transverse ridge

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Fig. 2

The behavior of the ridge inside EHL contact at different time steps: (a)–(c) SRR = 1.0 and (d)–(f) SRR = –1.0

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Fig. 3

Illustration of ridge deformation (RD) and complementary wave (CW) at given time steps for positive and negative rolling–sliding conditions

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Fig. 4

Deformed and undeformed ridge profiles: (a) pure rolling and (b) rolling–sliding SRR = 1.0. Contact inlet on the left.

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Fig. 5

Film thickness and pressure distributions for three different mean velocities and SRR = 1.0

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Fig. 6

Deformed ridge for a range of um and given SRR = ±1.0 for Eyring model

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Fig. 10

Deformed ridge for um = 0.04 and 0.08 m/s and SRR = ±1.0 for Newtonian (dashed lined) and Eyring (solid line) models

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Fig. 7

Deformed ridge profiles for a range of um = 0.02, 0.04, and 0.08 m/s and SRRs = ±0.5, ±1.0, and ±1.5: (a) positive SRRs and (b) negative SRRs

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Fig. 8

Comparison with experiments—from left to right: SRR = 0.5, SRR = 1.0, and SRR = 1.5. Contact inlet is on the left.

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Fig. 9

Comparison with experiments—from left to right: SRR = −0.5, SRR = −1.0, and SRR = −1.5. Contact inlet is on the left.

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