On the mechanism of multi-valued friction in unsteady sliding line contacts operating in the regime of mixed-film lubrication

Xuejun Zhai, G. Needham, Liming Chang

Research output: Contribution to journalArticle

Abstract

Systematic analyses are presented to reveal the mechanism of multi-valued friction behavior in lubricated sliding contacts with time-varying velocities. The analyses are based on the theoretical results generated by a mixed-film friction model developed in this paper for line contacts. The model, which integrates theories of transient elastohydrodynamics and asperity contact mechanics, is validated by comparing its results with published experimental data. The results and the subsequent analyses disclose that strong multi-valued friction behavior can only be generated in the mixed-film lubrication regime with simultaneous presence of significant asperity contacts and hydrodynamic squeeze. Principal factors which influence the magnitude of dynamic friction are investigated in the paper. Being instructive to the design of tribo-contacts in precise-motion control systems, the analyses suggest means to minimize the undesirable multi-valued friction behavior through proper selection of system parameters.

Original languageEnglish (US)
Journal[No source information available]
StatePublished - 1996

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Lubrication
Friction
Elastohydrodynamics
Motion control
Contacts (fluid mechanics)
Mechanics
Hydrodynamics
Control systems

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

Cite this

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title = "On the mechanism of multi-valued friction in unsteady sliding line contacts operating in the regime of mixed-film lubrication",
abstract = "Systematic analyses are presented to reveal the mechanism of multi-valued friction behavior in lubricated sliding contacts with time-varying velocities. The analyses are based on the theoretical results generated by a mixed-film friction model developed in this paper for line contacts. The model, which integrates theories of transient elastohydrodynamics and asperity contact mechanics, is validated by comparing its results with published experimental data. The results and the subsequent analyses disclose that strong multi-valued friction behavior can only be generated in the mixed-film lubrication regime with simultaneous presence of significant asperity contacts and hydrodynamic squeeze. Principal factors which influence the magnitude of dynamic friction are investigated in the paper. Being instructive to the design of tribo-contacts in precise-motion control systems, the analyses suggest means to minimize the undesirable multi-valued friction behavior through proper selection of system parameters.",
author = "Xuejun Zhai and G. Needham and Liming Chang",
year = "1996",
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On the mechanism of multi-valued friction in unsteady sliding line contacts operating in the regime of mixed-film lubrication. / Zhai, Xuejun; Needham, G.; Chang, Liming.

In: [No source information available], 1996.

Research output: Contribution to journalArticle

TY - JOUR

T1 - On the mechanism of multi-valued friction in unsteady sliding line contacts operating in the regime of mixed-film lubrication

AU - Zhai, Xuejun

AU - Needham, G.

AU - Chang, Liming

PY - 1996

Y1 - 1996

N2 - Systematic analyses are presented to reveal the mechanism of multi-valued friction behavior in lubricated sliding contacts with time-varying velocities. The analyses are based on the theoretical results generated by a mixed-film friction model developed in this paper for line contacts. The model, which integrates theories of transient elastohydrodynamics and asperity contact mechanics, is validated by comparing its results with published experimental data. The results and the subsequent analyses disclose that strong multi-valued friction behavior can only be generated in the mixed-film lubrication regime with simultaneous presence of significant asperity contacts and hydrodynamic squeeze. Principal factors which influence the magnitude of dynamic friction are investigated in the paper. Being instructive to the design of tribo-contacts in precise-motion control systems, the analyses suggest means to minimize the undesirable multi-valued friction behavior through proper selection of system parameters.

AB - Systematic analyses are presented to reveal the mechanism of multi-valued friction behavior in lubricated sliding contacts with time-varying velocities. The analyses are based on the theoretical results generated by a mixed-film friction model developed in this paper for line contacts. The model, which integrates theories of transient elastohydrodynamics and asperity contact mechanics, is validated by comparing its results with published experimental data. The results and the subsequent analyses disclose that strong multi-valued friction behavior can only be generated in the mixed-film lubrication regime with simultaneous presence of significant asperity contacts and hydrodynamic squeeze. Principal factors which influence the magnitude of dynamic friction are investigated in the paper. Being instructive to the design of tribo-contacts in precise-motion control systems, the analyses suggest means to minimize the undesirable multi-valued friction behavior through proper selection of system parameters.

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