Determinations of thermoelastic instability for ball-bearing-like specimens with spacers and in grease lubrications

Chang Fu Han, Chang Shuo Chang, Cheng Jyun Wu, Hsiao Yeh Chu, Jeng Haur Horng, Chin Chung Wei, Jen Fin Lin

Research output: Contribution to journalArticle

Abstract

Frictional torque jump is present at ball-bearing-like specimens in grease lubrications, it is formed to be bearing instabilities at a time dependent on bearingʹs groove factor, raceway's roughness. Intrinsic mode functions for vibrations are identified as the results of ball-spacer tribo contacts through FFT analyses. By the facts of having the highest wear and seizures, spacer instability is assumed to be related to these jumps. The instability model is developed for ball-spacer interactions considering the partition of frictional heat and thermal effects on linear expansion of dominant side. The inception time and its friction coefficient predicted by the present model are close to those shown in experiments. This model provides an efficient formula to evaluate the effects on inception time.

Original languageEnglish
Article number106415
JournalTribology International
Volume151
DOIs
Publication statusPublished - 2020 Nov

All Science Journal Classification (ASJC) codes

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

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