Research Papers: Friction and Wear

Wear Rate and Entropy Generation Sources in a Ti6Al4V–WC/10Co Sliding Pair

[+] Author and Article Information
J. S. Rudas

Tribology and Surfaces Group,
Universidad Nacional de Colombia,
Medellin 050041, Colombia;
Energy Research and Innovation Group,
Institución Universitaria Pascual Bravo,
Medellin 050034, Colombia
e-mail: jsrudas@unal.edu.co

L. M. Gómez

Research Group in Dynamic Processes,
Universidad Nacional de Colombia,
Medellin 050041, Colombia
e-mail: limage@unal.edu.co

A. Toro

Tribology and Surfaces Group,
Universidad Nacional de Colombia,
Medellin 050041, Colombia
e-mail: aotoro@unal.edu.co

J. M. Gutiérrez

Material Composite Group,
University of Cádiz,
Algeciras 11202, Spain
e-mail: josemaria.gutierrez@uca.es

A. Corz

Material Composite Group,
University of Cádiz,
Algeciras 11202, Spain
e-mail: alfonso.corz@uca.es

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received December 28, 2016; final manuscript received March 10, 2017; published online July 10, 2017. Assoc. Editor: Sinan Muftu.

J. Tribol 139(6), 061608 (Jul 10, 2017) (8 pages) Paper No: TRIB-16-1405; doi: 10.1115/1.4036321 History: Received December 28, 2016; Revised March 10, 2017

The potential of applying thermodynamics to study the tribological response of a tribological system is addressed in this paper. In order to do so, a model was developed to obtain the entropy flow generated by three different dissipative processes present in dry sliding, namely, thermal gradient, heat conduction, and abrasion. The flash and bulk temperatures at the contact interface were obtained with the aid of the finite element method (FEM), and pin-on-disk tests were performed by using titanium alloy (Ti6Al4V) disks and tungsten carbide (WC/10Co) pins. Then, the wear rate obtained from the tribological tests was correlated with the calculated entropy flow, and a degradation coefficient was associated to the sliding process. A linear dependence of the wear rate and the degradation coefficient was observed regardless of the variation of the points of operation of the system, so it is proposed that the coefficient of degradation used is inherent to the tribological system.

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Fig. 1

Abstraction of contact interface on pin-on-disk configuration: heat and mass flow

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Fig. 2

fab factor representation [19]

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Fig. 3

Schematic of the proposed algorithm for calculating the degradation coefficient

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Fig. 4

Schematic of the different contact path diameters used to guarantee the same relative sliding speed in all the tests (a) and typical setup for the wear tests (b)

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Fig. 5

General configuration and mesh used for the developed FEM models

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Fig. 6

Temperature distribution on the disk and the pin during a test. Angular velocity ω = 6.91 rad/s: (a) Ø1/8 in pin and (b) Ø1/4 in pin.

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Fig. 7

Temperature distribution on the disk and the pin during a test. Angular velocity ω = 10.37 rad/s: (a) Ø1/8 in pin and (b) Ø1/4 in pin.

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Fig. 8

Temperature distribution on the disk and the pin during a test. Angular velocity ω = 18.43 rad/s: (a) Ø1/8 in pin and (b) Ø1/4 in pin.

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Fig. 9

Entropy generated by the three dissipation mechanisms studied as a function of the angular velocity: (a) Ø1/4 in pin and (b) Ø1/8 in pin

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Fig. 10

Comparison of degradation coefficients for Ø1/4 in and Ø1/8 in pins





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