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research-article

Effect of Load and Temperature on the Tribological Characteristics of a Steel Pin on Polyoxymethylene Disk Interface

[+] Author and Article Information
Matthew G Larson

Department of Mechanical Engineering Bradley University 1501 W. Bradley Ave. Peoria, IL 61625
mlarson@mail.bradley.edu

Shannon J Timpe

Department of Mechanical Engineering Bradley University 1501 W. Bradley Ave. Peoria, IL 61625
sjtimpe@fsmail.bradley.edu

1Corresponding author.

ASME doi:10.1115/1.4035341 History: Received August 15, 2016; Revised November 08, 2016

Abstract

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 ploughing friction mechanism at higher loads. As load increases, the pin asperities penetrate into the hard, injection mold-induced skin layer, causing an increase in frictional ploughing. The coefficient of friction was observed to decrease from 0.08 at 22 °C to 0.05 at 50 °C, and to subsequently rise to 0.07 at 160 °C. The initial drop was caused by a decrease in 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.

Copyright (c) 2016 by ASME
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