Wear-Rate Uncertainty Analysis

[+] Author and Article Information
Tony L. Schmitz, Jason E. Action, David L. Burris, John C. Ziegert, W. Gregory Sawyer

Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611

J. Tribol 126(4), 802-808 (Nov 09, 2004) (7 pages) doi:10.1115/1.1792675 History: Received September 13, 2003; Revised March 18, 2004; Online November 09, 2004
Copyright © 2004 by ASME
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Schematic of the reciprocating tribometer constructed for this study
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Normal force versus time for PTFE on steel contact; histograms of the upper and lower normal forces are shown to the right
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Schematic of the cosine error in the normal force measurements
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Results from testing used to determine the angular misalignment illustrated in Fig. 3
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Schematic of the counterface/sliding direction misalignment
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Histogram from a 10,000 point Monte Carlo simulation using values taken from Table 1; the mean value was 5.05×10−4 mm3/Nm with a standard deviation of 7.4×10−5 mm3/Nm
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Histogram from 21 experiments with PTFE on stainless steel; the mean value was K=5.04×10−4 mm3/Nm with a standard deviation of 6.0×10−5 mm3/Nm
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Interrupted wear-rate measurement results are shown; the light gray open circles and associated error bars correspond to measurements completed using the original scale and calipers; black error bars and regression line represent data gathered using the new scale and micrometer. The error bars in the vertical and horizontal directions are plotted in each case, but some cannot be observed at the plot scale. Using the new equipment, the caps on the error bars are longer than the bars themselves.




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