Modelling tribochemistry in the mixed lubrication regime

Azam, Abdullah; Ghanbarzadeh, Ali; Neville, Anne; Morina, Ardian; Wilson, Mark C. T.

doi:10.1016/j.triboint.2018.12.024

Cited by 29 publications

(25 citation statements)

References 54 publications

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“…The tribochemical mixed lubrication model developed earlier by the authors [37] was used to study the effects of tribofilm growth on lubricaiton parameters. The tribofilm growth was found to have significant effect on the lubricaiton parameters.…”

Section: Resultsmentioning

confidence: 99%

“…In the following, first the mixed lubrication model is detailed and then the tribochemical model is outlined. The integration of these two models and the solution procedure have been presented elsewhere [37,40] but details are provided in the following sections for completeness.…”

Section: The Complete Tribochemical Mixed Lubrication Modelmentioning

confidence: 99%

“…In this way, by repeating this process, the solution moves from purely elastic to elasto-plastic until a converged is achieved. More details on the method can be found in [40] and [37].…”

Section: Plastoelastohydrodynamic Lubrication (Pehl) Modelmentioning

confidence: 99%

“…The current study builds upon the author's recent work on the tribochemical film growth model [37,38]. The continuum restriction is overcome by approximating tribochemical film growth as an empirical equation.…”

Section: Introductionmentioning

confidence: 99%

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The mutual interaction between tribochemistry and lubrication: Interfacial mechanics of tribofilm

Azam

Dorgham

Parsaeian

et al. 2019

Tribology International

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A new mechanism for the action of antiwear tribofilms is proposed. The antiwear action of ZDDP additive is believed to be mainly due to the formation of tribofilms that reduce wear by chemical action. In this study, a mixed lubrication model is developed and tribofilm growth integrated into this model to simulate the effects of tribofilms on lubrication. The dynamic evolution of the contacting surfaces due to plastic deformation, wear and tribofilm growth continuously change the lubrication characteristics inside the contact. It is observed that the growth of tribofilm roughens the contact and increase contact severity. It was found that this roughness increase also helps to entrain more lubricant, resulting in thicker lubricant films. Therefore, the plot of the evolution of film thickness ratio (h central (t)/R q (t)) shows that the lubrication regime is improved by the presence of tribofilm. Therefore, not only the chemical presence but the physical presence of the tribofilm on the surfaces also helps to improve contact performance by retaining more lubricant and improving the lubrication regime.

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Section: Resultsmentioning

confidence: 99%

Section: The Complete Tribochemical Mixed Lubrication Modelmentioning

confidence: 99%

“…In this way, by repeating this process, the solution moves from purely elastic to elasto-plastic until a converged is achieved. More details on the method can be found in [40] and [37].…”

Section: Plastoelastohydrodynamic Lubrication (Pehl) Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The mutual interaction between tribochemistry and lubrication: Interfacial mechanics of tribofilm

Azam

Dorgham

Parsaeian

et al. 2019

Tribology International

Self Cite

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“…In numerical solutions of thin film lubrication when film thickness decreases down to a few nanometers, surface forces due to the van de Waals interactions and electrostatic double layer have to be incorporated [589], and they are found to contribute significantly to the film formation that prevents surfaces from sticking at zero speed. In a recent attempt to model tribochemistry in mixed lubrication, Azam et al [609] have presented a formula that balances the tribofilm growth described in the Arrhenius equation with film removal obeying an exponential law. Simulation results indicate that tribofilm grows in patchy, inhomogeneous manner within rubbing track, and the mean tribofilm thickness increases with sliding-rolling ratio.…”

Section: Incorporation Of Surface Interactionsmentioning

confidence: 99%

A review of recent advances in tribology

et al. 2020

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The reach of tribology has expanded in diverse fields and tribology related research activities have seen immense growth during the last decade. This review takes stock of the recent advances in research pertaining to different aspects of tribology within the last 2 to 3 years. Different aspects of tribology that have been reviewed including lubrication, wear and surface engineering, biotribology, high temperature tribology, and computational tribology. This review attempts to highlight recent research and also presents future outlook pertaining to these aspects. It may however be noted that there are limitations of this review. One of the most important of these is that tribology being a highly multidisciplinary field, the research results are widely spread across various disciplines and there can be omissions because of this. Secondly, the topics dealt with in the field of tribology include only some of the salient topics (such as lubrication, wear, surface engineering, biotribology, high temperature tribology, and computational tribology) but there are many more aspects of tribology that have not been covered in this review. Despite these limitations it is hoped that such a review will bring the most recent salient research in focus and will be beneficial for the growing community of tribology researchers.

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Towards optimum additive performance: A numerical study to understand the influence of roughness parameters on the zinc dialkyldithiophosphates tribofilm growth

Wang

Dorgham

Liu

et al. 2020

Lubrication Science

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In recent years, several theoretical models to predict the triboreactive film thickness of zinc dialkyldithiophosphates (ZDDP) have been developed. Although these models are not complete and are approximate in nature, they provide a framework which can be used to evaluate the factors impacting the tribofilm growth. In this paper, rough surfaces with different roughness parameters were numerically generated and used to calculate the tribofilm growth. The simulation results show that lower negative skewness, higher kurtosis, and larger autocorrelation length values give thicker ZDDP tribofilms with skewness and autocorrelation values having a greater effect on the tribofilm growth. Based on the simulation results, it is found that these parameters influence the tribofilm growth by changing the contact ratio which eventually changes the dynamic growth of tribofilm and wear of substrate. The results presented in this paper have bigger implications for industry in designing surface textures that promote the anti-wear action.

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Modelling tribochemistry in the mixed lubrication regime

Abstract: This is a repository copy of Modelling tribochemistry in the mixed lubrication regime.

Cited by 29 publications

References 54 publications

The mutual interaction between tribochemistry and lubrication: Interfacial mechanics of tribofilm

The mutual interaction between tribochemistry and lubrication: Interfacial mechanics of tribofilm

A review of recent advances in tribology

Towards optimum additive performance: A numerical study to understand the influence of roughness parameters on the zinc dialkyldithiophosphates tribofilm growth

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