The static and dynamic friction properties of a steel pin on polyoxymethelyne homopolymer disk were studied at temperatures ranging from 22 to 160 °C. Samples were tested at externally applied normal loads ranging from 20 to 80 N. Under this range of temperatures, the friction coefficients displayed a linearly increasing dependence on the load. The load dependence is attributed to an enhanced contribution of the plowing friction mechanism at higher loads. As load increases, the pin asperities penetrate into the hard, injection mold-induced skin layer, causing an increase in the frictional plowing. The coefficient of friction was observed to decrease from 0.08 at 22 °C to 0.05 at 50 °C, and subsequently rise to 0.07 at 160 °C. The initial drop was caused by a decrease in the modulus of elasticity attributed to the rise in molecular mobility with increased available thermal energy. As the temperature increased to 160 °C, however, the further decrease in modulus allowed the penetration of the pin asperities to increase significantly, requiring increased material displacement to initiate frictional motion.
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September 2017
Research-Article
Effect of Load and Temperature on the Tribological Characteristics of a Steel Pin on Polyoxymethylene Disk Interface
Matthew G. Larson,
Matthew G. Larson
Department of Mechanical Engineering,
Bradley University,
1501 W. Bradley Avenue,
Peoria, IL 61625
e-mail: mlarson@mail.bradley.edu
Bradley University,
1501 W. Bradley Avenue,
Peoria, IL 61625
e-mail: mlarson@mail.bradley.edu
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Shannon J. Timpe
Shannon J. Timpe
Department of Mechanical Engineering,
Bradley University,
1501 W. Bradley Avenue,
Peoria, IL 61625
e-mail: sjtimpe@fsmail.bradley.edu
Bradley University,
1501 W. Bradley Avenue,
Peoria, IL 61625
e-mail: sjtimpe@fsmail.bradley.edu
Search for other works by this author on:
Matthew G. Larson
Department of Mechanical Engineering,
Bradley University,
1501 W. Bradley Avenue,
Peoria, IL 61625
e-mail: mlarson@mail.bradley.edu
Bradley University,
1501 W. Bradley Avenue,
Peoria, IL 61625
e-mail: mlarson@mail.bradley.edu
Shannon J. Timpe
Department of Mechanical Engineering,
Bradley University,
1501 W. Bradley Avenue,
Peoria, IL 61625
e-mail: sjtimpe@fsmail.bradley.edu
Bradley University,
1501 W. Bradley Avenue,
Peoria, IL 61625
e-mail: sjtimpe@fsmail.bradley.edu
1Corresponding author.
Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received August 15, 2016; final manuscript received November 8, 2016; published online April 4, 2017. Assoc. Editor: Min Zou.
J. Tribol. Sep 2017, 139(5): 051603 (5 pages)
Published Online: April 4, 2017
Article history
Received:
August 15, 2016
Revised:
November 8, 2016
Citation
Larson, M. G., and Timpe, S. J. (April 4, 2017). "Effect of Load and Temperature on the Tribological Characteristics of a Steel Pin on Polyoxymethylene Disk Interface." ASME. J. Tribol. September 2017; 139(5): 051603. https://doi.org/10.1115/1.4035341
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