Nel rolling contact tests — accelerated service simulation tests for lubricants and materials for rolling elements

Scott, Douglas; Blackwell, J.

doi:10.1016/0043-1648(71)90040-8

Cited by 27 publications

(2 citation statements)

References 8 publications

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“…Test results have been found to be reasonably reproducible and have in some instances been found to correlate well with full‐scale test results and service experience for gears and for rolling‐element bearings …”

Section: Methodsmentioning

confidence: 58%

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Investigations into the occurrence of pitting in lubricated rolling four-ball tests

2013

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Pitting, a form of rolling contact fatigue, is a complex phenomenon and several factors influence its occurrence, particularly under lubricated conditions. In this work, studies have been conducted to observe the events that occur during lubricated rolling four-ball tests that may affect or eventually lead to the formation of pits. This is performed to form an understanding of the pit formation process. Included is tribofilm formation, surface degradation, wear mode, material changes and crack initiation sites. These investigations have been performed on the ball samples from rolling four-ball tests, conducted using two API GL-5 gear oils. The analyses revealed the formation of a low hardness region beneath the surface of the running track due to martensite decay. The formation rate and expansion of this region was found to differ for the two lubricating oils. The pitted balls also indicated that the initial fatigue cracks were initiated at or close to the surface.

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Section: Methodsmentioning

confidence: 58%

“…The rolling four‐ball test was first reported by Barwell and Scott, also described by Scott and Blackwell in ref. . It was originally designed to simulate the combination of rolling and sliding experienced in angular contact ball bearings.…”

Section: Methodsmentioning

confidence: 99%

Investigations into the occurrence of pitting in lubricated rolling four-ball tests

2013

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The mechanisms governing crack and pit formation in steel in rolling sliding contact in aqueous lubricants

Sullivan

Middleton²

1989

J of Synthetic Lubrication

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This paper presents the results of an investigation of the fatigue damage of steel surfaces operated in rolling/sliding contact conditions in the presence of water glycol‐based fire resistant fluids. It has been shown that pitting life depends on the relative magnitude of fluid film thickness and the lubrication regime in which the system is operated. A minimum in pitting life is shown to occur in the mixed‐elastohydrodynamic region. Mechanisms for crack initiation, propagation and subsequent pit formation in aqueous lubricants are proposed.

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Tribomécanique

Godet

Play

Berthe

et al. 1975

Rheological Theories · Measuring Techniques in Rheology Test Methods in Rheology · Fractures Rheological Properties of Material

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Nel rolling contact tests — accelerated service simulation tests for lubricants and materials for rolling elements

Cited by 27 publications

References 8 publications

Investigations into the occurrence of pitting in lubricated rolling four-ball tests

Investigations into the occurrence of pitting in lubricated rolling four-ball tests

The mechanisms governing crack and pit formation in steel in rolling sliding contact in aqueous lubricants

Tribomécanique

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