Effects of spinning on the mixed thermal elastohydrodynamic lubrication and fatigue life in point contacts

Yan, Xiao-Liang; Zhang, Yuyan; Xie, Guoxin; Qin, Fen; Zhang, Xuewen

doi:10.1177/1350650119847404

Cited by 8 publications

(7 citation statements)

References 36 publications

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“…Therefore, DC-FFT method is applied to improve the speed of convolution [30]. After the all stress components within subsurface were obtained, equivalent stress τ vm could be determined by the following expression [31].…”

Section: Subsurface Contact Stress Field Calculation Methodsmentioning

confidence: 99%

Comparison of rolling contact fatigue life between elastohydrodynamic lubricated point contacts pre and post running-in treatment

Cao

Khan

Meng

2020

Tribology International

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Rolling contact micropitting fatigue life is affected by stress fields in shallow subsurface. It is well known that there is a significant dependence, of stress distribution in subsurface, on the surface microstructures. Therefore rolling contact micropitting fatigue lives can be enhanced through modifying surface topography. In this study, running-in method was employed as the method to alter surface microstructures to explore the effect of various morphological characteristics on micropitting fatigue lives.Firstly, various rough surfaces were formed by applying experimental running in processes on a series of ball-on-disc pairs. Meanwhile, the evolutions of topography during the running-in processes were recorded. Secondly, rolling contact fatigue lives of these rough surfaces under elastohydrodynamic lubricated condition were calculated and compared based on Zaretsky's fatigue model combined with elastic contact mechanics.The results have indicated that a running-in process has significantly positive effect on prolonging micropitting fatigue lives. Theoretical analysis of the relationship between topographical parameters and micropitting fatigue lives to ascertain optimum morphological characteristics which are beneficial in reducing micropitting fatigue failures is the key originality of this work. This work provides guidelines on surface morphology for achieving maximum pitting fatigue life for interacting systems. In turn enhanced durability of the systems will lead to significant cost savings.

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Section: Subsurface Contact Stress Field Calculation Methodsmentioning

confidence: 99%

Comparison of rolling contact fatigue life between elastohydrodynamic lubricated point contacts pre and post running-in treatment

Cao

Khan

Meng

2020

Tribology International

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“…The bearing capacity of the lubricating film should be balanced with the contact load per unit length. 33 where, p = p f + p c, p f and p c are the hydrodynamic pressure and the asperity contact pressure, respectively.…”

Section: Tribo-dynamic Model Of Cam-tappet Pairmentioning

confidence: 99%

Predictions of friction and temperature at marine cam-tappet interface based on mixed lubrication analysis with real surface roughness

Hua

Shi

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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The working conditions of cam-tappet pairs in marine diesel engines are directly influenced by the engine output power, the operational speed, the temperature, as well as the components surface micro-morphology, etc., which cause the cam-tappet pairs work in the mixed lubrication state, thus the interfacial friction, pressure and temperature rise are vital to engine performance, efficiency, and durability. An interfacial friction–temperature prediction model for the cam-tappet pairs, considering the effects of transient working conditions and the real surface roughness, is developed in the present study, based on the theories of the transient mixed EHL and the heat transfer under the condition of a fast moving heat source. The numerical results of surface temperature rise are compared with those from the Blok formula, and a good agreement is found. The obtained results show that the presence of 3D roughness may lead to a decrease in the lubricant film thickness, and the surface temperature rise of tappet may exceed 700 K, which is close to the material scuffing temperature, causing the surface failure due to scuffing and wear. If increasing the cam speed and base circle radius within certain range, it may lead to the increment of film thickness and reduction of surface temperature rise, thus the lubrication effectiveness is increased. In addition, using cast aluminum bronze may significantly reduce the surface temperature rise and improve the interfacial characteristics.

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“…The authors observed that the non-uniform velocity fields, induced by spin action, can produce a local maximum on the film thickness contours close to the exit constriction of the contact. In a recent study using a thermoelastohydrodynamic (TEHL) model with the consideration of mixed and boundary lubrication, Yan et al [16] also explored the effect of spin, aiming to replicate similar operating conditions as those in Continually Variable Transmissions (CVT). The authors' focus was on the effect of fatigue life induced by any spinning of the contact footprint.…”

Section: Introductionmentioning

confidence: 99%

Transient non-Newtonian elastohydrodynamics of rough meshing hypoid gear teeth subjected to complex contact kinematics

Sivayogan

Rahmani

Rahnejat

2022

Tribology International

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Effects of spinning on the mixed thermal elastohydrodynamic lubrication and fatigue life in point contacts

Cited by 8 publications

References 36 publications

Comparison of rolling contact fatigue life between elastohydrodynamic lubricated point contacts pre and post running-in treatment

Comparison of rolling contact fatigue life between elastohydrodynamic lubricated point contacts pre and post running-in treatment

Predictions of friction and temperature at marine cam-tappet interface based on mixed lubrication analysis with real surface roughness

Transient non-Newtonian elastohydrodynamics of rough meshing hypoid gear teeth subjected to complex contact kinematics

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