Elasto-Hydrodynamic Lubrication of Rolling-Contact Surfaces

Sibley, L. B.; Orcutt, F. K.

doi:10.1080/05698196108972435

Cited by 65 publications

(19 citation statements)

References 5 publications

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“…11 then is taken as the viscosity corresponding to the beginning of the pressure zone and a is the pressure coefficient of viscosity defined by Substituting for o; Q" and Q in Eq. [6] , it is found that to take account of the effect of surface roughness on the measuring technique, Eq . [5] must be replaced by o, + Qf = Q12.…”

Section: Th Eor Etical ; Calib Rat Ion Of Padmentioning

confidence: 99%

The Variation of Film Thickness in Highly Loaded Contacts

Christensen

1964

A S L E Transactions

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S yst ematic m easurements wit h a disk machin e of t he thick ness of th e lubr icatin g film separating the surf aces of heavily loaded rollers hav e been made, and th e variati on of film thi ck ness w ith applied load and rolling speed has been studied. It was found that the result s can be expressed by:where H is th e minimum film thickness in th e contact in microns , W is the appli ed load per unit width in dyn es per centime ter, and TjU is expr essed in dyne s per centimeter.eom porison with recent elasto-hydrodynamic th eory shows that the result s agree at least to the magnit ude of film thi ckn ess. Significant differences in the details, howev er, indicate a further need for experimental data.

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Section: Th Eor Etical ; Calib Rat Ion Of Padmentioning

confidence: 99%

The Variation of Film Thickness in Highly Loaded Contacts

Christensen

1964

A S L E Transactions

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“…Most of this experimental validation has used the technique of optical interferometry where a hard-EHL contact is formed between a transparent flat and a reflective ball or roller and film thickness is determined from the interference between the two light beams reflected from the pair of solid surfaces that contain the lubricant film. Other experimental techniques have also been applied such as measurement of capacitance [19,20], x-ray transmission [21], fluorescence intensity [22,23] and ultrasonic reflection [24], but none of these methods have approached the accuracy and ease of use of the optical interference method.…”

Section: Introductionmentioning

confidence: 99%

Elastohydrodynamic film thickness of soft EHL contacts using optical interferometry

Marx

Guegan

Spikes

2016

Tribology International

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Robust, chromium, semi-reflective coatings have been applied to transparent polymethylmethacrylate and polyurethane discs and this has enabled conventional, normal incidence optical interferometry to be used to measure lubricant film thickness in soft EHL conditions for the first time. High quality interferograms comparable to those obtained from coated glass discs are obtained. Measured film thickness has been compared with existing soft EHL film thickness equations obtained using computer modelling and revised central and minimum film thickness equations have been proposed. These film thickness measurements and measurement technique have applicability to our understanding of the performance and design of lubricated gears and bearings manufactured from polymeric materials.

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“…However, it was deteonined in previous testing [4] that 3-pereent sliding had negligible effect on film thickness. In other independent measurements reported by Crook [17], the film temperature rose markedly with only a slight decrease in film thickness when considerable sliding 'was superimposed on the rolling'motion between two disks.…”

Section: Transactions Of the Asmementioning

confidence: 99%

“…The five-ball fatigue tester, described initially in reference (7) and shown in Figs. l(a) and (b), consists essentially of a test specimen pyramided upon four lower support balls ~62-LUb- 4) ~~~n~:~_! :~:-_-r-u-e-a-f-r-om------N-A-S-A-fi-v-e-~-a-ll-f-a-ti-g-w-~-s-~-r-,I-b--L-~--b-e-a-ri-n-g-5-0-~-e-r-~-n-t-lli-'e-,-m-ill-~-M-~ positioned by a separator, and free to rotate in an angular contact raceway, Fig.…”

Section: Apparatusmentioning

confidence: 99%

The Role of Elastohydrodynamic Lubrication in Rolling-Contact Fatigue

Zaretsky

Sibley

Anderson

1963

Journal of Basic Engineering

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The five-ball fatigue tester was used to determine the rolling-contact fatigue life of 1/2-inch-diameter M-1 steel balls with four lubricants at 300 deg F. Film thickness measurements were made with the rolling-contact disk machine under simulated five-ball test conditions. Under certain conditions, elastohydrodynamic lubrication was found to exist at initial maximum Hertz stress levels up to 800,000 psi. There appears to be a correlation among the following variables: Plastically deformed profile radius of the ball specimen at ambient temperature; lubricant type; and rolling-contact fatigue. No correlation was found between contact temperature obtained with different lubricants and fatigue life.

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Elasto-Hydrodynamic Lubrication of Rolling-Contact Surfaces

Cited by 65 publications

References 5 publications

The Variation of Film Thickness in Highly Loaded Contacts

The Variation of Film Thickness in Highly Loaded Contacts

Elastohydrodynamic film thickness of soft EHL contacts using optical interferometry

The Role of Elastohydrodynamic Lubrication in Rolling-Contact Fatigue

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