Rolling contact fatigue in lubricated contacts

Rico, José Esteban Fernández; Battez, A. Hernández; Cuervo, Diego García

doi:10.1016/s0301-679x(02)00097-x

Cited by 28 publications

(11 citation statements)

References 4 publications

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“…These results agree with those of Fernandez Rico, et al (12), who found that higher viscosity was beneficial for mineral oils but the opposite was true for PAO in rolling four-ball tests, although they used higher load/lower speed in their studies.…”

Section: Discussionsupporting

confidence: 91%

“…have been reported; see, for example, Torrance, et al (5), Wan,et al (6), Nixon (7), Phillips and Quinn (8), Bartz and Krüger (9), and Pasaribu and Lugt (10). Some studies have investigated the influence of base oil properties on pitting (Battez,et al (11); Fernandez Rico, et al (12); Arnsek and Vizintin (13)). The different pitting lives obtained are in general attributed to the physical properties of the oils.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Gear Oil Properties on Pitting Life in Rolling Four-Ball Test Configuration

Johansson

Devlin²,

Guevremont³

et al. 2013

Tribology Transactions

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There is a connection between the efficiency of oils and their wear and/or surface damage protective properties, an area not so well described in the literature. One such damage mode is macroscale contact fatigue on gear tooth flank surfaces, also called pitting. The present study is aimed at investigating the correlation between gear oils' physical properties, important in terms of gear transmission losses, and pitting life. Eight gear oils were formulated giving different combinations of base oil, viscosity, and concentration of friction modifiers. All eight oils also contained an additive package designed to meet GL-5 specifications. This study consists of three parts. In the first, the oils' physical properties were measured using a set of bench tests. In the second, the pitting lives of the oils were evaluated using rolling four-ball tests. The third part deals with the correlation between the measured physical properties of the oils and their pitting lives. This is achieved through multiple linear regression, with a view to finding the salient properties that have a significant influence on pitting life. The results show that gear oils' physical properties do have a large influence on the pitting lives. Oil properties that lower interfacial tangential stresses are beneficial in enhancing pitting life.

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Effects of Gear Oil Properties on Pitting Life in Rolling Four-Ball Test Configuration

Johansson

Devlin²,

Guevremont³

et al. 2013

Tribology Transactions

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“…According to the IP 300/82 [31] standard method, the time vs. probability of damage were marked on the Weibull graph. Such prepared graphs provided the values of L10 and L50, defining the durability of the tribosystem at 10% and 50% probability of damage, respectively [32][33][34][35]. On the basis of pitting time values, the accumulated percentage of damages was calculated as follows: the probability of damage = i/(n+1)*100%…”

Section: The Subject and Methodology Of Researchmentioning

confidence: 99%

The influence of type of dispersed phase on rolling contact fatigue of lubricating greases on mineral base oil

Kozdrach¹

2020

Finnish J. Trib.

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The paper discusses the influence of type dispersed phase on value of rolling contact fatigue of bearings lubricated with selected lubricating compositions. The compositions, which were produced on the mineral base oil were thickened of lithium stearate, calcium stearate, aluminum stearate, lithium complex soap and modified silica, montmorillonite, and polytetrafluoroethylene were evaluated. Were carried out the investigations of rolling contact fatigue (pitting) of bearings, which were lubricated of the compositions prepared on the above-mentioned thickeners. Then was evaluated the influence of various thickeners on changes of rolling contact fatigue. The tribological tests were carried out using T-03 four-ball machine under high load conditions. On the basis of obtained results it may be concluded, that used of thickeners such as: modified amorphous silica, montmorillonite and polytetrafluoroethylene to produce of lubricating compositions, positively affected on the change of rolling contact fatigue of tribosystems lubricated with the above-mentioned compositions in comparison to the compositions, when as a dispersed phase were used a soap thickeners.

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“…Any clear evidence as to the origin of the cracks in rolling four‐ball tests with steel ball samples has, to the authors' knowledge, not been reported in the open literature. It has however been speculated that these can be initiated at the surface and beneath the surface . Therefore, an extensive study investigating the subsurface region in terms of cracks, not fully developed into pits, is performed.…”

Section: Introductionmentioning

confidence: 99%

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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Rolling contact fatigue in lubricated contacts

Cited by 28 publications

References 4 publications

Effects of Gear Oil Properties on Pitting Life in Rolling Four-Ball Test Configuration

Effects of Gear Oil Properties on Pitting Life in Rolling Four-Ball Test Configuration

The influence of type of dispersed phase on rolling contact fatigue of lubricating greases on mineral base oil

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

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