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research-article

Assessment of Topography Parameters During Running-in and Subsequent Rolling Contact Fatigue Tests

[+] Author and Article Information
Deepak K. Prajapati

Mechanical Engineering Department Kanpa Road, Bihta Patna, BIHAR 801103 India deepak.pme14@iitp.ac.in

Mayank Tiwari

IIT Patna Bihta Bihar, 801103 India mayankt@iitp.ac.in

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the Journal of Tribology. Manuscript received September 6, 2018; final manuscript received January 25, 2019; published online xx xx, xxxx. Assoc. Editor: Sinan Muftu.

ASME doi:10.1115/1.4042676 History: Received September 06, 2018; Accepted January 25, 2019

Abstract

Rolling contact fatigue is one of the major problems observed in gear mechanisms, which leads to high friction ultimately resulting in high energy consumption. This paper demonstrates the evolution of surface topography during running-in and subsequent rolling contact fatigue (RCF) tests under boundary or mixed-elastohydrodynamic lubrication regimes. The case-hardened discs of equal surface finish and hardness are used in the experiments, and the evolution of surface topography is investigated using a white light interferometer (WLI). Surface topography at different load stages is measured at three distinct points, on the disks and average roughness and topography parameters are reported. Semi-quantitative techniques are used to determine the asperity level parameters at different load stages. From the running-in experiment, it is found that running-in is a fast process where substantial change in surface topography occurs due to plastic deformation of most prominent asperity. From the rolling contact fatigue test (RCF) test, it is concluded that within range of the fatigue cycles, the RMS roughness (Sq) is negatively correlated with the summit radius (R), autocorrelation length (Sal) and positively correlated with summit density (Sds) and RMS slope (Sdq). Scanning Electron Microscope (SEM) analysis reveal disappearance of grinding ridges, the formation of micro pits at very small scale and pit growth in sliding direction.

Copyright © 2019 by ASME
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