# A mathematical model for rolling/sliding line contacts in boundary and near boundary lubrication

Qingtao Yu, L. Chang, Yeau-Ren Jeng

Research output: Contribution to journalArticle

8 Citations (Scopus)

### Abstract

This paper presents a mathematical model for rolling/sliding line contacts operating in boundary and near boundary lubrication. The model is developed with first-principle formulations and incorporates key mechanical, thermal and tribo-chemical aspects of the problem including mode of deformation of the contact, friction, flash temperature, boundary film characterization and fluid-solid load sharing. For given load, speeds, bulk temperature and proportion of solid load-sharing, the model outputs a number of variables that are useful for the assessment of the state and severity of the problem. They include contact pressure, temperature, degree of plastic deformation, friction coefficient, friction power intensity, degree of friction-induced junction growth and integrity of the boundary film. The model may be implemented into a gear contact model to study gear systems under loss of lubrication. It may also be integrated with the light mixed-lubrication model of the authors to develop a more complete mixed-lubrication model covering the entire regime of the mixed lubrication. The model is evaluated with a limited scope and more extensive evaluations are needed in time of its validity and applicability through various means and in various settings.

Original language English 1279-1291 13 Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 229 11 https://doi.org/10.1177/1350650115577115 Published - 2015 Nov 29

### Fingerprint

boundary lubrication
Lubrication
sliding
mathematical models
Mathematical models
lubrication
Friction
friction
Gears
integrity
Temperature
coefficient of friction
plastic deformation
temperature
flash
Plastic deformation
proportion
coverings
formulations
Fluids

### All Science Journal Classification (ASJC) codes

• Mechanical Engineering
• Surfaces and Interfaces
• Surfaces, Coatings and Films

### Cite this

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title = "A mathematical model for rolling/sliding line contacts in boundary and near boundary lubrication",
abstract = "This paper presents a mathematical model for rolling/sliding line contacts operating in boundary and near boundary lubrication. The model is developed with first-principle formulations and incorporates key mechanical, thermal and tribo-chemical aspects of the problem including mode of deformation of the contact, friction, flash temperature, boundary film characterization and fluid-solid load sharing. For given load, speeds, bulk temperature and proportion of solid load-sharing, the model outputs a number of variables that are useful for the assessment of the state and severity of the problem. They include contact pressure, temperature, degree of plastic deformation, friction coefficient, friction power intensity, degree of friction-induced junction growth and integrity of the boundary film. The model may be implemented into a gear contact model to study gear systems under loss of lubrication. It may also be integrated with the light mixed-lubrication model of the authors to develop a more complete mixed-lubrication model covering the entire regime of the mixed lubrication. The model is evaluated with a limited scope and more extensive evaluations are needed in time of its validity and applicability through various means and in various settings.",
author = "Qingtao Yu and L. Chang and Yeau-Ren Jeng",
year = "2015",
month = "11",
day = "29",
doi = "10.1177/1350650115577115",
language = "English",
volume = "229",
pages = "1279--1291",
journal = "Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology",
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publisher = "SAGE Publications Ltd",
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}

In: Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, Vol. 229, No. 11, 29.11.2015, p. 1279-1291.

Research output: Contribution to journalArticle

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T1 - A mathematical model for rolling/sliding line contacts in boundary and near boundary lubrication

AU - Yu, Qingtao

AU - Chang, L.

AU - Jeng, Yeau-Ren

PY - 2015/11/29

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N2 - This paper presents a mathematical model for rolling/sliding line contacts operating in boundary and near boundary lubrication. The model is developed with first-principle formulations and incorporates key mechanical, thermal and tribo-chemical aspects of the problem including mode of deformation of the contact, friction, flash temperature, boundary film characterization and fluid-solid load sharing. For given load, speeds, bulk temperature and proportion of solid load-sharing, the model outputs a number of variables that are useful for the assessment of the state and severity of the problem. They include contact pressure, temperature, degree of plastic deformation, friction coefficient, friction power intensity, degree of friction-induced junction growth and integrity of the boundary film. The model may be implemented into a gear contact model to study gear systems under loss of lubrication. It may also be integrated with the light mixed-lubrication model of the authors to develop a more complete mixed-lubrication model covering the entire regime of the mixed lubrication. The model is evaluated with a limited scope and more extensive evaluations are needed in time of its validity and applicability through various means and in various settings.

AB - This paper presents a mathematical model for rolling/sliding line contacts operating in boundary and near boundary lubrication. The model is developed with first-principle formulations and incorporates key mechanical, thermal and tribo-chemical aspects of the problem including mode of deformation of the contact, friction, flash temperature, boundary film characterization and fluid-solid load sharing. For given load, speeds, bulk temperature and proportion of solid load-sharing, the model outputs a number of variables that are useful for the assessment of the state and severity of the problem. They include contact pressure, temperature, degree of plastic deformation, friction coefficient, friction power intensity, degree of friction-induced junction growth and integrity of the boundary film. The model may be implemented into a gear contact model to study gear systems under loss of lubrication. It may also be integrated with the light mixed-lubrication model of the authors to develop a more complete mixed-lubrication model covering the entire regime of the mixed lubrication. The model is evaluated with a limited scope and more extensive evaluations are needed in time of its validity and applicability through various means and in various settings.

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