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TECHNICAL PAPERS

Vapor-Phase Lubrication in Combined Rolling and Sliding Contacts: Modeling and Experimentation

[+] Author and Article Information
W. Gregory Sawyer, Thierry A. Blanchet

Department of Mechanical Engineering, Aeronautical Engineering and Mechanics, Rensselaer Polytechnic Institute, Troy, NY 12180

J. Tribol 123(3), 572-581 (Jul 06, 2000) (10 pages) doi:10.1115/1.1308039 History: Received January 27, 2000; Revised July 06, 2000
Copyright © 2001 by ASME
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References

Figures

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(a) A generic two-body combined rolling and sliding contact. Lubricous islands are drawn dark on an otherwise bare (white) surface. (b) In the model, the annular wear paths are unwrapped and represented as linear wear tracks with a length equal to the circumference. The shading in on the bare surface in the removal zone is used to distinguish it from the region where deposition may occur.
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A schematic of the WAM-1 combined rolling and sliding tribometer
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The friction coefficient responses to changing acetylene partial pressures (noted) in a combined rolling and sliding contact with M50 steel specimens at 540°C, 2 m/s rolling speed, 10 cm/s sliding speed, 100 N load, and a disk wear track diameter of 8.64 cm
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The friction coefficient responses to changing acetylene partial pressures (noted) in two tests of combined rolling and sliding contact with M50 steel specimens at 540°C, 2 m/s rolling speed, 20 cm/s sliding speed, 100 N load, and a disk wear track diameter of 8.64 cm
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Steady-state friction coefficient, taken from Fig. 4, versus acetylene partial pressure. The coefficient of determination for the model curve-fit R2=0.893 achieved using K=0.177*10−3 mm/N and ν=0.0988 kPa−1 s−1.
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The friction coefficient responses to changing sliding speed in three tests of combined rolling and sliding contact with M50 steel specimens at 540°C, 0.05 atmospheres of acetylene, 2 m/s rolling speed, 100 N load, and a disk wear track diameter of 8.64 cm
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Steady-state friction coefficient, taken from Fig. 6, versus sliding speed. The coefficient of determination for the model curve-fit R2=0.714 achieved using K=0.33 mm/N and ν=85.5 kPa−1 s−1.
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The friction coefficient responses to changing disk wear-track diameter (noted) in two tests of combined rolling and sliding contact with M50 steel specimens at 540°C, 0.05 atmospheres of acetylene, 10 cm/s sliding speed, 100 N load, and a constant disk rotational speed of 380 rpm. Acetylene partial pressure interrupted periodically, as noted by (0), to remove lubricant deposited during previous operating condition.
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Steady-state friction coefficient, taken from Fig. 8, versus the disk wear track diameter. The coefficient of determination for the model curve-fit R2=0.0726 achieved using K =0.16 mm/N and ν=49.4 kPa−1s−1.
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Normalized friction coefficient predictions as a function of the nondimensional deposition group over the range ζD*=0.001-10 (a) VR*=10,Fn*=10, and varying VS* (b) VS*=0.001,Fn*=10, and varying VR* (c) VS*=0.001,VR*=0.01, and varying Fn*
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Normalized friction coefficient predictions as a function of the nondimensional sliding speed group over the range VS*=0.001-200 (a) VR*=100,Fn*=10, and varying ζD* (b) ζD*=1,Fn*=1, and varying VR* (c) ζD*=1,VR*=100, and varying Fn*
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Normalized friction coefficient predictions as a function of the nondimensional rolling speed group over the range VR*=0.05-100 (a) VS*=0.1,Fn*=10, and varying ζD* (b) ζD*=1,Fn*=1, and varying VS* (c) ζD*=1,VS*=0.1, and varying Fn*
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Normalized friction coefficient predictions as a function of the nondimensional load group over the range Fn*=0.01-10,000 (a) VS*=0.01,VR*=100, and varying ζD* (b) ζD*=1,VR*=100, and varying VS* (c) ζD*=1,VS*=0.001, and varying VR*
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Contour plot of normalized friction coefficient for the pin-on-disk case as a function of the nondimensional deposition group D*=10−3−103 and load group Fn*=10−3−103

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