Thermodynamics of grease degradation

Jude A. Osara; Michael D. Bryant

doi:10.1016/j.triboint.2019.05.020

Thermodynamics of grease degradation

Jude A. Osara^*, Michael D. Bryant

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

38 Citations (Scopus)

Abstract

A review of grease degradation mechanisms and existing grease models is presented, followed by a detailed thermodynamic analysis of grease degradation. Fundamental formulations are derived from thermodynamic laws and applied to instantaneous nonlinear response of grease to loading. The resulting model of grease degradation relates grease shear stress response to mechanical work, temperatures and environmental effects via the irreversible entropy generated by these dissipative interactions. The model is experimentally verified, and a universally consistent grease characterization methodology is described. A near 100% agreement between the grease model and nonlinear data from uncontrolled experimental measurements is achieved. The model also gives rise to new material and process parameters to characterize grease for performance and hence, system optimization.

Original language	English
Pages (from-to)	433-445
Number of pages	13
Journal	Tribology international
Volume	137
DOIs	https://doi.org/10.1016/j.triboint.2019.05.020
Publication status	Published - Sept 2019
Externally published	Yes

Keywords

Degradation
Greases
Lubrication
Shear stress

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10.1016/j.triboint.2019.05.020

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title = "Thermodynamics of grease degradation",

abstract = "A review of grease degradation mechanisms and existing grease models is presented, followed by a detailed thermodynamic analysis of grease degradation. Fundamental formulations are derived from thermodynamic laws and applied to instantaneous nonlinear response of grease to loading. The resulting model of grease degradation relates grease shear stress response to mechanical work, temperatures and environmental effects via the irreversible entropy generated by these dissipative interactions. The model is experimentally verified, and a universally consistent grease characterization methodology is described. A near 100% agreement between the grease model and nonlinear data from uncontrolled experimental measurements is achieved. The model also gives rise to new material and process parameters to characterize grease for performance and hence, system optimization.",

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author = "Osara, {Jude A.} and Bryant, {Michael D.}",

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AU - Osara, Jude A.

AU - Bryant, Michael D.

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AB - A review of grease degradation mechanisms and existing grease models is presented, followed by a detailed thermodynamic analysis of grease degradation. Fundamental formulations are derived from thermodynamic laws and applied to instantaneous nonlinear response of grease to loading. The resulting model of grease degradation relates grease shear stress response to mechanical work, temperatures and environmental effects via the irreversible entropy generated by these dissipative interactions. The model is experimentally verified, and a universally consistent grease characterization methodology is described. A near 100% agreement between the grease model and nonlinear data from uncontrolled experimental measurements is achieved. The model also gives rise to new material and process parameters to characterize grease for performance and hence, system optimization.

KW - Degradation

KW - Greases

KW - Lubrication

KW - Shear stress

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SN - 0301-679X

VL - 137

SP - 433

EP - 445

JO - Tribology international

JF - Tribology international

ER -

Thermodynamics of grease degradation

Abstract

Keywords

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Corrigendum to “Thermodynamics of grease degradation” [Tribol Int 137 (2019) 433–445] (Tribology International (2019) 137 (433–445), (S0301679X19302798), (10.1016/j.triboint.2019.05.020))

Cite this