A closed-form time- and position-dependent model for coverage, based on the adsorption of environmental contaminants and their removal through the pin contact, is developed for reciprocating contacts. The model employs an adsorption fraction and removal ratio to formulate a series expression for the entering coverage at any cycle and location on the wear track. A closed-form solution to the series expression is presented and compared to other coverage models developed for steady-state coverage for pin-on-disk contacts, reciprocating contacts, or the time-dependent center-point model for reciprocating contacts. The friction coefficient is based on the average coverage under the pin contact. The model is compared to position- and time-dependent data collected on near-frictionless carbon self-mated contacts on a reciprocating tribometer in a nitrogen atmosphere. There are many similarities between the model curves and the data, both in magnitude and trends. No new curve fitting was performed in this paper, with all needed parameters coming from previous models of average friction coefficient behavior.
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January 2005
Technical Papers
A Gas-Surface Interaction Model for Spatial and Time-Dependent Friction Coefficient in Reciprocating Contacts: Applications to Near-Frictionless Carbon
P. L. Dickrell,
P. L. Dickrell
Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611
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W. G. Sawyer,
W. G. Sawyer
Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611
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J. A. Heimberg,
J. A. Heimberg
Naval Research Laboratory, Tribology Section Code 6176, Washington, DC 20375
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I. L. Singer,
I. L. Singer
Naval Research Laboratory, Tribology Section Code 6176, Washington, DC 20375
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K. J. Wahl,
K. J. Wahl
Naval Research Laboratory, Tribology Section Code 6176, Washington, DC 20375
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A. Erdemir
A. Erdemir
Argonne National Laboratory, Energy Technology Division, Argonne, IL 60439
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P. L. Dickrell
Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611
W. G. Sawyer
Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611
J. A. Heimberg
Naval Research Laboratory, Tribology Section Code 6176, Washington, DC 20375
I. L. Singer
Naval Research Laboratory, Tribology Section Code 6176, Washington, DC 20375
K. J. Wahl
Naval Research Laboratory, Tribology Section Code 6176, Washington, DC 20375
A. Erdemir
Argonne National Laboratory, Energy Technology Division, Argonne, IL 60439
Manuscript received March 2, 2004; revision received July 26, 2004. Review conducted by: M. Fillon.
J. Tribol. Jan 2005, 127(1): 82-88 (7 pages)
Published Online: February 7, 2005
Article history
Received:
March 2, 2004
Revised:
July 26, 2004
Online:
February 7, 2005
Citation
Dickrell , P. L., Sawyer, W. G., Heimberg , J. A., Singer , I. L., Wahl, K. J., and Erdemir, A. (February 7, 2005). "A Gas-Surface Interaction Model for Spatial and Time-Dependent Friction Coefficient in Reciprocating Contacts: Applications to Near-Frictionless Carbon ." ASME. J. Tribol. January 2005; 127(1): 82–88. https://doi.org/10.1115/1.1829719
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