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Research Papers: Elastohydrodynamic Lubrication

The Effects of Microdimple Texture on the Friction and Thermal Behavior of a Point Contact

[+] Author and Article Information
S. Li

Department of Mechanical and
Materials Engineering,
Wright State University,
3640 Colonel Glenn Highway,
Dayton, OH 45435

U. Parmar

Department of Mechanical and
Materials Engineering,
Wright State University,
3640 Colonel Glenn Highway,
Dayton, OH 45435

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received November 2, 2017; final manuscript received January 26, 2018; published online March 2, 2018. Assoc. Editor: Xiaolan Ai.

J. Tribol 140(4), 041503 (Mar 02, 2018) (12 pages) Paper No: TRIB-17-1417; doi: 10.1115/1.4039228 History: Received November 02, 2017; Revised January 26, 2018

This study investigates the effects of the microdimple texture on the friction and surface temperature performances of a ball-on-disk contact, operating under the speed and load ranges that cover typical gearing applications. Circular-shaped microdimple arrays with different dimple center distances and dimple depths are implemented on the ball surface to quantify the impacts of these two parameters on the friction coefficient and the maximum ball surface temperature. In addition, the contacts of three surface texture combinations, namely microdimpled and polished ball surface versus polished disk surface, polished ball surface versus polished disk surface, and ground ball surface versus ground disk surface, are compared to demonstrate any beneficial or detrimental effect of microdimples in heavily loaded high-speed applications. This study adopts a thermal mixed EHL point contact model, whose capability and accuracy have been well demonstrated by comparing to the experimental measurements, to quantify the deterministic tribological behavior within the contact, allowing the exploration of the underlying mechanism that governs the role of microdimples in the elastohydrodynamic lubrication (EHL).

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Figures

Grahic Jump Location
Fig. 1

The contact setup between a circular ball and a flat disk

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Fig. 2

The surface topographies of (a) ball specimen and (b) disk specimen for the type I surface texture combination defined in Table 1

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Fig. 3

The surface topography of ground surface

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Fig. 4

The variations of W and ph with time for one complete ball-on-disk contact simulation

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Fig. 5

The distributions of (a) asperity contacts, (b) contact pressure, (c) lubricant temperature, and (d) ball surface temperature within the Hertzian zone. The surface texture combination is type I of Table 1. The microdimple array is case HaDa of Table 2. ur=10 m/s and ph=2.5 GPa.

Grahic Jump Location
Fig. 6

The comparisons of (a) μ¯ and (b) T¯1max between the microdimple array cases HaDa, HaDb, and HaDc (defined in Table 2) for the type I surface texture combination (defined in Table 1) under ur=10 m/s

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Fig. 7

The comparisons of the asperity contact activity (left column) and the contact pressure (right column) between the microdimple array cases: (a) HaDa, (b) HaDb, and (c) HaDc within the Hertzian zone. The surface texture combination is type I of Table 1. ur=10 m/s and ph=2.5 GPa.

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Fig. 8

The variations of μ¯ (left column) and T¯1max (right column) with the dimple center distance D and the dimple depth H at the rolling velocities (a) ur=10 m/s, (b) ur=5 m/s, and (c) ur=0.5 m/s and the lowest loading stage ph=0.5 GPa for the type I surface texture combination (defined in Table 1)

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Fig. 9

The variations of μ¯ (left column) and T¯1max (right column) with the dimple center distance D and the dimple depth H at the rolling velocities: (a) ur=10 m/s, (b) ur=5 m/s, and (c) ur=0.5 m/s and the median loading stage ph=1.5 GPa for the type I surface texture combination (defined in Table 1)

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Fig. 10

The variations of μ¯ (left column) and T¯1max (right column) with the dimple center distance D and the dimple depth H at the rolling velocities: (a) ur=10 m/s, (b) ur=5 m/s, and (c) ur=0.5 m/s and the highest loading stage ph=2.5 GPa for the type I surface texture combination (defined in Table 1)

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Fig. 11

The comparisons of μ¯ between type I (with HaDa dimple array), type II and type III surface texture combinations under (a) ur=10 m/s, (b) ur=5 m/s, and (c) ur=0.5 m/s

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Fig. 12

The comparisons of the asperity contact activity (left column) and the contact pressure (right column) between the surface texture combinations of (a) type I with HaDa dimple array, (b) type II, and (c) type III within the Hertzian zone. ur=10 m/s and ph=2.5 GPa

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Fig. 13

The comparisons of T¯1max between type I (with HaDa dimple array), type II and type III surface texture combinations under (a) ur=10 m/s, (b) ur=5 m/s, and (c) ur=0.5 m/s

Tables

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