Research Papers: Friction and Wear

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 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

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 139(5), 051603 (Apr 04, 2017) (5 pages) Paper No: TRIB-16-1263; doi: 10.1115/1.4035341 History: Received August 15, 2016; Revised November 08, 2016

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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Grahic Jump Location
Fig. 1

(a) The pin-on-disk test apparatus with the normal load applied using a free floating loading arm and a load cell positioned to measure the tangential load and (b) a close-up view of the interface

Grahic Jump Location
Fig. 2

A characteristic data set. The upper dashed line indicates the initial peak in friction forces corresponding to the static friction and the lower dashed line corresponds to the dynamic friction force during steady-state sliding.

Grahic Jump Location
Fig. 3

The static and dynamic friction coefficients as a function of the externally applied normal load. The markers represent individual measurements. All tests were performed at 160 °C.

Grahic Jump Location
Fig. 4

The static coefficient of friction as a function of the test temperature. The bottom and top error bars represent the minimum and maximum values, the lower and upper boxes represent the lower and upper quartiles, and the central lines represent the median values.



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