New Results of Traction Force Calculations in Elastohydrodynamic Contacts

Houpert, L.

doi:10.1115/1.3261033

Cited by 156 publications

(78 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[16] and developed by Ref. [17]: The dependence of viscosity on shear rate (shear thinning) is described by the Eyring model with the Eyring stress τ 0 depending on temperature and pressure outlined by Evans and Johnson [14].…”

Section: Methodsmentioning

confidence: 99%

CFD modeling compared to temperature and friction measurements of an EHL line contact

Hartinger

Reddyhoff

2018

Tribology International

View full text Add to dashboard Cite

In this paper, predictions from CFD modeling are compared against measurements of surface temperatures and friction for an EHL line contact lubricated with the fluid Santotrac 50. Two slide-to-roll-ratios (SRR), 50% and 100%, and entrainment velocities ranging from 0.211 to 1.13 m/s are considered. Very good agreement is shown for the 50% SRR cases, with only a 3% deviation in friction coefficient values. At 100% SRR, the deviation in friction increases to 3-7% which is attributed to deficiencies in the modeling approach with regard to shearthinning. The temperature profiles agree reasonably well at 50% SRR and show larger deviations at 100% SRR. For all cases, the formation of a shear-band in the center of the fluid film is predicted. This is very pronounced for 100% SRR, although likely to be over-estimated by this CFD-approach. The data presented here serve as a basis from which further refinements in the modeling and measurements shown can be made.

show abstract

Section: Methodsmentioning

confidence: 99%

CFD modeling compared to temperature and friction measurements of an EHL line contact

Hartinger

Reddyhoff

2018

Tribology International

View full text Add to dashboard Cite

show abstract

“…The pressure dependence of the lubricant's low-shear dynamic viscosity is described by Roelands' equation [44] as expressed by Houpert [45]:…”

Section: High-pressure-low-shear Viscosity Characteristicsmentioning

confidence: 99%

An Analytical Approach for Prediction of Elastohydrodynamic Friction with Inlet Shear Heating and Starvation

et al. 2016

View full text Add to dashboard Cite

An analytical friction model is presented, predicting the coefficient of friction in elastohydrodynamic (EHD) contacts. Three fully formulated SAE 75W-90 axle lubricants are examined. The effect of inlet shear heating (ISH) and starvation is accounted for in the developed friction model. The film thickness and the predicted friction are compared with experimental measurements obtained through optical interferometry and use of a mini traction machine. The results indicate the significant contribution of ISH and starvation on both the film thickness and coefficient of friction. A strong interaction between those two phenomena is also demonstrated, along with their individual and combined contribution on the EHD friction.

show abstract

“…The lubricant rheological state (η, G) is adjusted for the prevailing contact pressure and temperature. For lubricant viscosity [32,33], where * is a function of both pressure and temperature. S 0 and z are constants for the lubricant which are independent of the system pressure and viscosity.…”

Section: Tribometrymentioning

confidence: 99%

Multiscale Friction in Lubricant-Surface Systems for High-Performance Transmissions Under Mild Wear

et al. 2018

View full text Add to dashboard Cite

The lubricant-surface system is complex in nature and can significantly affect the frictional performance of high-performance transmission systems. The complexity stems from the coupled mechanical and chemical phenomena that occur at the interfacial tooth conjunctions. A combined analytical and precision experimental approach is presented to analyse the salient parameters of the lubricant-surface system. A multiscale procedure comprising topographical measurement, pin-on-disc tribometry, atomic force microscopy in lateral force mode, X-ray photo-electron spectroscopy and continuum contact mechanics analysis under mixed non-Newtonian thermo-elastohydrodynamics is used to describe the formation of a tribo-film, as well as wear and frictional characteristics of the lubricant-surface system. The contribution of chemisorbed and physisorbed bonded tribo-film on the boundary coefficient of friction is ascertained at different physical scales. Therefore, the paper presents a novel multiscale analysis, promoting improved understanding of the complex interactions between mechanisms of friction, wear and surface chemistry.

show abstract

New Results of Traction Force Calculations in Elastohydrodynamic Contacts

Cited by 156 publications

References 0 publications

CFD modeling compared to temperature and friction measurements of an EHL line contact

CFD modeling compared to temperature and friction measurements of an EHL line contact

An Analytical Approach for Prediction of Elastohydrodynamic Friction with Inlet Shear Heating and Starvation

Multiscale Friction in Lubricant-Surface Systems for High-Performance Transmissions Under Mild Wear

Contact Info

Product

Resources

About