On the Theory of Thermal Elastohydrodynamic Lubrication at High Slide-Roll Ratios—Line Contact Solution

Yang, Peiran; Qu, Shiliang; Chang, Qi; Guo, Feng

doi:10.1115/1.1330738

Cited by 60 publications

(51 citation statements)

References 17 publications

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“…The impact of the lubrication and surface roughness on the tribological performance and fatigue behavior of contacting elements have been widely investigated in recent years, and significant improvements have been developed [7][8][9]. Qiao et al [10] compared fatigue model results for elastohydrodynamic lubrication (EHL) with surface roughness.…”

Section: Introductionmentioning

confidence: 99%

Study on contact fatigue of a wind turbine gear pair considering surface roughness

Liu

Zhu

et al. 2019

Friction

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Contact fatigue issues become more and more crucial in gear industry as they significantly affect the reliability and service life of associated mechanical systems such as wind turbine gearboxes. The contact fatigue behavior is mostly determined by the mechanical properties of materials and stress fields near the contact area, which is further influenced by the lubrication and surface roughness due to pressure fluctuations. In this study, a numerical model incorporating the lubrication state, tooth surface roughness, residual stress, and mechanical properties of the material is developed to determine the contact fatigue behavior of a megawatt level wind turbine carburized gear. The variations of the hardness and residual stress along the depth were characterized by the Vickers hardness measurement and X-ray diffraction test, respectively. The elastohydrodynamic lubrication theory was applied to predict the contact pressure distribution, highlighting the influence of the surface roughness that stemed from the original measurement through an optical profiler. The stress histories of the studied material points during a complete contact loading cycle were fast calculated using the discreteconcrete fast Fourier transformation (DC-FFT) method. Modified Dang Van diagrams under different working conditions were determined to estimate the contact fatigue failure risk. The effect of the root mean square (RMS) value of the surface roughness on the failure risk at critical material points were discussed in detail. Results revealed that the surface roughness significantly increases the contact fatigue failure risk within a shallow area, and the maximum risk appears near the surface.

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Section: Introductionmentioning

confidence: 99%

Study on contact fatigue of a wind turbine gear pair considering surface roughness

Liu

Zhu

et al. 2019

Friction

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“…Conduction in the lubricant film plane is neglected as well as convection in the lubricant film thickness in agreement with Yang et al [23]. The heat source due to compression is computed as…”

Section: Energy Equationsmentioning

confidence: 96%

Numerical insight into heat transfer and power losses in spinning EHD non-Newtonian point contacts

Doki-Thonon

Fillot

Vergne

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part J:

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This article focuses on thermal effects and their consequences in elastohydrodynamically lubricated spinning non-Newtonian point contacts. The particular kinematics of spin is of major interest for the understanding of flange contact in bearings (also known as rib-roller end contact) as well as in the field of continuously variable transmission where energetic efficiency is directly related to spin. A versatile finite element thermal non-Newtonian model is presented and results in terms of pressure, film thickness, temperature, heat fluxes, friction, and power losses are discussed. As spin increases, the central and minimum film thicknesses decrease drastically, the contact temperature rises, and the shearing heat source increases. The heat fluxes are totally reorganized in terms of direction and intensity. Friction values in both longitudinal and transverse directions need to be completed with the calculation of the frictional torque due to spin to take into account the total power losses in the contact. This study intends to draw attention to the necessity of an energetic approach when dealing with spinning contacts.

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“…However, a dimpled film shape occurred in simple sliding and opposite sliding conditions. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] Under the simple sliding condition, the dimples observed by Chiu and Sibley 1 and Kaneta et al 2,3 were theoretically simulated by Qu et al 4 and explained by a mechanism of ''temperature-viscosity wedge,'' which was first proposed by Cameron. 5 The ''temperature-viscosity wedge'' is a viscosity gradient caused by the temperature difference that is similar to the wedge-shaped gap that generates dynamic pressure.…”

Section: Introductionmentioning

confidence: 99%

Effect of oil starvation on the surface dimple in elastohydrodynamic lubrication contact under opposite sliding conditions

Meng

Wang

Zhang

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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Optical interferometry experiments were performed to investigate the dimple phenomena in starved elastohydrodynamic lubrication of point contacts under opposite sliding condition by using a high viscosity polybutene (PB) lubricant. The effects of the bilateral starvation, left starvation, and right starvation on the variation of the oil film under a high slide-to-roll ratio were investigated. It was found that oil starvation could generate a starved constriction, which would make the shape of the oil film resemble the one in pure-rolling or rolling-sliding contact. However, the film thickness at the starved constriction is much lower. In addition, the influence of the applied load on the variation of the surface dimple in fully flooded and starved conditions was explored. It was found that the effect of oil starvation depended on the way the net mass flow through the contact zone. When the net mass flow was from left to right, a major constriction was formed on the right side, and vice versa. When symmetrically increasing the degree of oil starvation, the classical big dimple shrunk and became centralized before eventually disappearing and the contact approximated the nominally flat state of a heavily starved or almost dry contact.

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On the Theory of Thermal Elastohydrodynamic Lubrication at High Slide-Roll Ratios—Line Contact Solution

Cited by 60 publications

References 17 publications

Study on contact fatigue of a wind turbine gear pair considering surface roughness

Study on contact fatigue of a wind turbine gear pair considering surface roughness

Numerical insight into heat transfer and power losses in spinning EHD non-Newtonian point contacts

Effect of oil starvation on the surface dimple in elastohydrodynamic lubrication contact under opposite sliding conditions

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