Assessment of the factors influencing micropitting in rolling/sliding contacts

Oila, Adrian; Bull, Steve

doi:10.1016/j.wear.2004.10.012

Cited by 112 publications

(66 citation statements)

References 26 publications

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“…For the mild wear (protected) situation it is first assumed that negligible wear will occur at these locations since the shearing will be located in the boundary layers formed on the steel surface and thus no bulk material will directly be removed. This corresponds well with real systems running in mild conditions since particles generated by this type of systems are mainly built up from chemical products which originated from the chemicals present in the oil [34,35]. The severe wear is based on the brittle wear behavior of high-strength carbon steels and is associated with a high coefficient of friction.…”

Section: Wear Modelsupporting

confidence: 70%

Running-In of Systems Protected by Additive-Rich Oils

Bosman

Schipper

2010

Tribol Lett

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Recent research on mild wearing systems running under boundary lubrication conditions focus more and more on the role of the nano-crystalline layer present at the surface of the components in contact. This layer has a typical thickness of a few tenths of nano-meters up to a few microns depending on the operational conditions. The role of this layer with respect to wear is, however, still unclear as well as its mechanical behavior. In this study, a first step is made in incorporating this type of layer into a wear model. Using an elasto-plastic semi-analytical-method the effect of different material behaviors reported through out current literature for the nano-crystalline layer on wear is studied. From the results it can be concluded that the effect of this mechanically altered layer has an important influence on the wear of the system, especially during the initial phase of running.

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Section: Wear Modelsupporting

confidence: 70%

Running-In of Systems Protected by Additive-Rich Oils

Bosman

Schipper

2010

Tribol Lett

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“…In comparison to longitudinal or isotropic roughness of the counterbody (rings), a transverse roughness is shown to accelerate the micropitting incipient on the contact body (roller) having a smoother surface compared to counterbody in the bearings [33,35] and gears [41]. Slide-to-roll ratio of two percent is set for the all experiments carried out in the Ring current study in accordance to Morales et al [35] report showing that the slide-to-roll ratio of 0.01-0.02 can prompt the maximum surface area affected by micropitting wear.…”

Section: Experimental Set Up I Micropitting Testsmentioning

confidence: 99%

Tribochemical study of micropitting in tribocorrosive lubricated contacts: The influence of water and relative humidity

Soltanahmadi

Morina

Eijk

et al. 2017

Tribology International

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Water ingress into the lubricant as a contaminant affects performance leading to an alteration in wear, corrosion and fatigue behaviour of the tribological components especially in the rolling element bearings. The current study addresses the tribochemical phenomena involved in micropitting in tribocorrosion systems where different levels of dissolved-water are present in a model lubricant. In this study the effect of different temperatures, water concentrations and relative humidities have been investigated on micropitting under rolling/sliding contacts. The influence of free and dissolved water on tribocorrosive micropitting is clarified. The tribochemical change of the reaction films is studied using X-ray Photoelectron Spectroscopy (XPS) which confirmed that the (poly)phosphate chain length and tribofilm thickness are reduced with increased dissolved-water level.

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“…When a high rotational speed is involved micropitting spreads; therefore not much can be done to stop propagation rate at high operational speeds. At a low load, the effect of temperature on micropitting reduces significantly [12]. …”

Section: Gear Micropitting and Key Influencing Factorsmentioning

confidence: 99%

“…Oila and Bull [12] statistically studied seven factors influence micropitting using twin discs to simulate gear tooth contact. Their study concluded that the key factors over the number of load cycles necessary for micropitting occurrence.…”

Section: Gear Micropitting and Key Influencing Factorsmentioning

confidence: 99%

Analytical and Experimental Study of Gear Surface Micropitting Due to Variable Loading

Long

Al-Tubi

Martinze

2015

AMM

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Abstract. This paper presents an investigation of the effect of load variation on gear tooth surface micropitting, for an application in planet gears in a wind turbine gearbox. To study the effect of load variation, two methods are employed: an experimental testing of gear micropitting under variable loading and a probabilistic analysis of gear contact stress and specific lubricant film thickness variations using the ISO Technical Report ISO/TR 15144-1:2010. The load variation of wind turbine gearbox is derived from SCADA (Supervisory Control and Data Acquisition) data recorded in operation. Both experimental and analytical results show that high levels of contact stress, load variations and repeated load cycles are determinant factors for the initiation and propagation of micropitting of gear tooth surfaces.

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Assessment of the factors influencing micropitting in rolling/sliding contacts

Cited by 112 publications

References 26 publications

Running-In of Systems Protected by Additive-Rich Oils

Running-In of Systems Protected by Additive-Rich Oils

Tribochemical study of micropitting in tribocorrosive lubricated contacts: The influence of water and relative humidity

Analytical and Experimental Study of Gear Surface Micropitting Due to Variable Loading

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