On Mechanisms of Fatigue Life Enhancement by Surface Dents in Heavily Loaded Rolling Line Contacts

Zhai, Xiaoming; Chang, L.; Hoeprich, Michael R.; Nixon, Harvey P.

doi:10.1080/10402009708983712

Cited by 41 publications

(17 citation statements)

References 15 publications

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“…A similar study that yielded the same observation was performed by Vrbka et al [10]. These works [8][9][10] concluded the enhancement of the fatigue life through surface denting could only be achieved when the contact experienced the very poor lubrication condition, where the lubricant reservoir mechanism of the micro-dents take effect.…”

supporting

confidence: 57%

“…The micro-scale surface topography of rolling mechanical elements (bearings and gears for example) plays an important role in the frictional power loss [1][2][3][4], the surface wear [5,6], the rolling contact fatigue (micro and macro scale pitting) failure [7][8][9][10][11][12], and the surface temperature related scuffing failure [13][14][15]. In the heavily loaded contacts of gearing applications, the presence of the significant surface roughness profiles (tool marks) due to the finishing processes, such as shaving and grinding, introduces frequent asperity Contacts within the elastohydrodynamic lubrication (EHL) conjunction.…”

Section: Background and Motivationmentioning

confidence: 99%

“…Borrowing the contact set-up of Akamatsu et al [7], Zhai et al [8] showed the surface dents had adverse impacts on the fatigue life when the contact was well-lubricated. Krupka et al [9] showed the shallow dents with the depth of 0.2 to 0.3 m failed to elongate the rolling contact fatigue life when the load was above 3.5GPa and the rolling velocity was above 4 m/s, although the same dents were found to be able to improve the lubrication under the load of 0.505GPa and the very low speed levels of 0.0013 and 0.0054 m/s.…”

mentioning

confidence: 99%

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The Effects of Microdimple Texture on the Friction and Thermal Behavior of a Point Contact

Parmar

2018

Journal of Tribology

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This study investigates the effects of the micro-dimple texture on the friction and surface temperature performances of a ball-on-disk contact, operating under the speed and load ranges that cover typical gearing applications. Circular shaped micro-dimple arrays with different dimple center distances and dimple depths are implemented on the ball surface to quantify the impacts of these two parameters on the friction coefficient and the maximum ball surface temperature. In addition, the contacts of three surface texture combinations, namely micro-dimpled and polished ball surface versus polished disk surface, polished ball surface versus polished disk surface and ground ball surface versus ground disk surface, are compared to demonstrate any beneficial or detrimental effect of micro-dimples in heavily loaded high speed applications. This study adopts a thermal mixed EHL point contact model, whose capability and accuracy have been well demonstrated by comparing to the experimental measurements, to quantify the deterministic tribological behavior within the contact, allowing the exploration of the underlying mechanism that governs the role of micro-dimples in the elastohydrodynamic lubrication.iv

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supporting

confidence: 57%

Section: Background and Motivationmentioning

confidence: 99%

mentioning

confidence: 99%

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The Effects of Microdimple Texture on the Friction and Thermal Behavior of a Point Contact

Parmar

2018

Journal of Tribology

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“…During the first stage it propagates through the surface deformation zone (about 10 µm deep). Then the crack turns downwards by a further [25][26][27][28][29][30][31][32][33][34][35] o and grows to a depth of around 300-400 µm . The branches of crack appear to grow at around 90 o to the main crack.…”

Section: Water Lubricationmentioning

confidence: 99%

The effects of surface defects on the fatigue of water-and oil-lubricated contacts

Gao

Dwyer-Joyce

2000

Proceedings of the Institution of Mechanical Engineers, Part J:

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A study into effects of surface defects on rolling contact fatigue of brass and rail steel has been undertaken on a twin-disc rolling-sliding test machine with both oil and water lubrication. Furrows and dents were artificially introduced into the disc surfaces, and surface micro cracks and pits were monitored by means of surface replication. The results showed that artificial dents only reduce the fatigue life of the contact with oil, but not water lubrication. With oil lubrication the fatigue failure initiates at the surface defect. However with water as a lubricant the whole of the surface undergoes cracking with the defect having no preferential effect. The possible mechanisms behind this behaviour are discussed in this paper.

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“…Other authors studied aspects of friction [13,14], effects on pressure [15,16] and contact fatigue [17][18][19][20][21][22][23][24][25][26][27]. During recent years several review papers dealing with surface texturing have been published.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Shallow Indentation Effects in a Rolling-Sliding EHL Contact Based on Amplitude Attenuation Theory

et al. 2017

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In this paper amplitude attenuation theory is used to predict film thickness variations caused by shallow indentation inside a rolling-sliding elastohydrodynamic (EHL) contact. The model providing a complete analytical description of roughness passage through the contact is considered. The estimation model is compared with film thickness measurement obtained by optical interferometry. The in-contact effects for several shapes of indentation were simulated. It is clearly shown that optimal indentation profile should have smooth shape with large diameter and small depth. The results were generally explained on theoretical curves which bring a clear insight into the transient phenomenon and can be used as a rapid engineering tool.

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On Mechanisms of Fatigue Life Enhancement by Surface Dents in Heavily Loaded Rolling Line Contacts

Cited by 41 publications

References 15 publications

The Effects of Microdimple Texture on the Friction and Thermal Behavior of a Point Contact

The Effects of Microdimple Texture on the Friction and Thermal Behavior of a Point Contact

The effects of surface defects on the fatigue of water-and oil-lubricated contacts

Prediction of Shallow Indentation Effects in a Rolling-Sliding EHL Contact Based on Amplitude Attenuation Theory

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