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Technical Briefs

Measurement of Load-Carrying Capacity of Thin Lubricating Films

[+] Author and Article Information
Xia Li, Feng Guo, Shuyan Yang

School of Mechanical Engineering,  Qingdao Technological University, 11 Fu Shun Road, Qingdao, Shandong Province, P. R. China

P. L. Wong

Department of Mechanical and Biomedical Engineering,  City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, P. R. China

J. Tribol 134(4), 044501 (Aug 21, 2012) (5 pages) doi:10.1115/1.4007109 History: Received February 14, 2012; Revised May 29, 2012; Published August 21, 2012; Online August 21, 2012

This paper presents an experimental procedure to evaluate the load-carrying capacity of a fixed-incline slider bearing (dimensionless load W versus convergence ratio K) using a slider-on-disk lubricating film test rig. In general, the applied load is the dependent variable and is directly measured for different convergence ratios such that the relation of the load-carrying capacity W and the convergence ratio K can be obtained. The load and slider inclination are fixed in the present approach, and the film thickness is measured at different speeds. As the dimensionless load can be a function of speed and film thickness, the variation of load-carrying capacity with respect to speed can be obtained even under a constant load and a fixed incline. It is shown that the measured load-carrying capacity is lower than that predicted by the classical hydrodynamic theory. Nevertheless, the experimental results acquire the same trend in the variation of dimensionless loads with convergence ratios. The theory holds that the load-carrying capacity is a single function of the convergence ratio. However, the experimental results show that the dimensionless load-carrying capacity is affected by the inclination angle of the slider, load, and the properties of lubricating oils.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

A fixed-incline slider bearing model

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Figure 2

Load-carrying capacity curve of an infinite slider bearing

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Figure 3

Schematic illustration of the test apparatus

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Figure 4

Measured film thickness h0 versus speed ud

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Figure 5

Measured load-carrying capacity and the theoretical curves

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Figure 6

Measurement of load-carrying capacity curves under different incline angles

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Figure 7

Load-carrying capacity under different lubricating oil

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Figure 8

Load-carrying capacity curves under different loads

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Figure 9

Film thickness versus load under different incline angle

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Figure 10

Dimensionless load-carrying capacity versus different load under different outlet film thickness

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