Tribological behavior and thermoelastic instability demonstrated in ball-bearing -like specimens operating in dry contacts and with grease lubrication

Chang Fu Han, Hsiao Yeh Chu, Po Chun Kuo, Neng Tung Liao, Yih Chyun Hwang, Yueh Lin Chiu, Jen Fin Lin

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Ball-bearing-like specimens are prepared with different groove factors (GF) to simulate a ball screw operating in dry contact and grease lubrication. The fluctuations of frictional coefficient μ are identified as instabilities in the running-in process and in the tribo contacts through the model developed for the threshold value μthreshold. The thermoelastic instability in the running-in is dominated by the surface roughness (Ra) and the GF, and is thus governed by the slip ratio (SR). The inception of running-in instability is the earliest when SR is the highest. With a fixed GF, an increase in Ra results in a SR rise. Wear coefficient increases by raising SR. The time for instability inception of base material is shortened by increasing SR.

Original languageEnglish
Pages (from-to)358-369
Number of pages12
JournalTribology International
Volume110
DOIs
Publication statusPublished - 2017 Jan 1

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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