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Research Papers: Elastohydrodynamic Lubrication

Comparisons of Tribological and Vibration Behaviors of Textured Point Contacts of Bearing Steel Lubricated With Oil and Grease Under Starved Conditions

[+] Author and Article Information
U. Sudeep

Department of Mechanical Engineering,
N.S.S. College of Engineering,
Palakkad 678008, India
e-mail: sudeep@nssce.ac.in

N. Tandon

ITMMEC,
Indian Institute of Technology Delhi,
Hauz Khas,
New Delhi 110 016, India
e-mail: ntandon@itmmec.iitd.ernet.in

R. K. Pandey

Department of Mechanical Engineering,
Indian Institute of Technology Delhi,
Hauz Khas,
New Delhi 110 016, India
e-mail: rajpandey@mech.iitd.ernet.in

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received February 17, 2015; final manuscript received October 27, 2015; published online March 21, 2016. Assoc. Editor: Ning Ren.

J. Tribol 138(3), 031504 (Mar 21, 2016) (12 pages) Paper No: TRIB-15-1058; doi: 10.1115/1.4032325 History: Received February 17, 2015; Revised October 27, 2015

Friction, wear, and vibration behaviors of oil-and grease-lubricated laser textured point contacts formed between AISI 52100 steel surfaces have been experimentally investigated under the unidirectional sliding motion using a ball-on-disk configuration. The performance behaviors of lubricated concentrated contacts formed between the lapped disk/lapped ball and textured disk/lapped ball have been compared at two Hertzian pressures (0.4 GPa and 0.7 GPa) and two sliding speeds (0.8 m/s and 2.4 m/s) using lubricating oil and grease. For the geometric configuration of point contacts adopted in the investigations, the textured point contacts lubricated with grease yielded reductions in the friction coefficient and specific wear rate (SWR) of the balls as compared to the oil-lubricated textured contacts. Moreover, reduction in the amplitudes of vibrations (at normal contact resonance frequencies) has also been observed with the grease-lubricated textured point contacts in comparison to the corresponding oil-lubricated cases.

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References

Sudeep, U. , Tandon, N. , and Pandey, R. K. , 2015, “ Performance of Lubricated Rolling/Sliding Concentrated Contacts WSurface Textures: A Review,” ASME J. Tribol., 137(3), p. 031501. [CrossRef]
Kovalchenko, A. , Ajayi, O. , Erdemir, A. , and Fenske, G. , 2011, “ Friction and Wear Behavior of Laser Textured Surface Under Lubricated Initial Point Contact,” Wear, 271(9–10), pp. 1719–1725. [CrossRef]
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Wang, W. , Huang, Z. , Shen, D. , Kong, L. , and Li, S. , 2013, “ The Effect of Triangle-Shaped Surface Textures on the Performance of the Lubricated Point-Contacts,” ASME J. Tribol., 135(2), p. 021503. [CrossRef]
Dumont, M. , Lugt, P. M. , and Tripp, J. H. , 2002, “ Surface Feature Effects in Starved Circular EHL Contacts,” ASME J. Tribol., 124(2), pp. 358–366. [CrossRef]
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Sudeep, U. , Tandon, N. , and Pandey, R. K. , 2015, “ Tribological Studies of Lubricated Laser Textured Point Contacts in Rolling/Sliding Reciprocating Motion With Investigations of Wettability and Nanohardness,” Tribol. Trans., 58(4), pp. 625–634. [CrossRef]
Greco, A. , Martini, A. , Liu, Y. , Lin, C. , and Wang, Q. J. , 2010, “ Rolling Contact Fatigue Performance of Vibro-Mechanical Textured Surfaces,” Tribol. Trans., 53(4), pp. 610–620. [CrossRef]
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Sudeep, U. , Pandey, R. K. , and Tandon, N. , 2013, “ Effects of Surface Texturing on Friction and Vibration Behaviors of Sliding Lubricated Concentrated Point Contacts Under Linear Reciprocating Motion,” Tribol. Int., 62, pp. 198–207. [CrossRef]
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Figures

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Fig. 1

Laser-textured disk: (a) photographic view of textured disk, (b) microscopic view of dimples, and (c) two-dimensional profile of dimples

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Fig. 2

Microscopic images of three surfaces employed in the tests: (a) lapped, (b) low-density texture, and (c) high-density texture

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Fig. 3

Pictorial description of experimental setup: (a) schematic diagram and (b) photographic view

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Fig. 4

Variation of friction coefficient with time

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Fig. 5

Photographic views of grease-lubricated textured and lapped tracks after the test (PH = 0.7 GPa and Us = 2.4 m/s)

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Fig. 6

Variation of coefficient of friction at oil- and grease-lubricated contacts at combinations of operating parameters

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Fig. 7

Micrographs of worn ball and disk surfaces (Us = 2.4 m/s and PH = 0.7 GPa): (a) oil-lubricated contacts and (b) grease-lubricated contacts

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Fig. 8

Schematic diagram showing the concept behind the wear volume calculation of the ball

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Fig. 9

SWR of balls at combinations of operating parameters

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Fig. 10

Vibration acceleration of the (a) oil- and (b) grease-lubricated contacts

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Fig. 11

RMS and kurtosis of the vibration acceleration at the oil- and grease-lubricated point contacts at combinations of operating parameters

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Fig. 12

Measured resonance frequencies of the oil-lubricated lapped concentrated contacts at two contact loads PH = 0.4 GPa and 0.7 GPa

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Fig. 13

Acceleration PSD of disk vibrations: (a) without contact and (b) with contact (PH = 0.4 GPa and Us = 0.8 m/s)

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Fig. 14

Acceleration power spectral density (PSD) of oil- and grease-lubricated contacts (PH = 0.4 GPa and Us = 0.8 m/s)

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Fig. 15

Acceleration PSD of oil- and grease-lubricated contacts (PH = 0.7 GPa and Us = 2.4 m/s)

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