An Investigation on Starvation Onset of Rough Surface Line Contacts

Li, S.; Kolivand, A.; Anisetti, Anusha

doi:10.1115/1.4051202

Cited by 4 publications

(1 citation statement)

References 33 publications

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“…Meshing gears are subjected to highly loaded concentrated contacts, resulting in two main forms of failure: wear and fatigue spalling [14]. The former is often caused by lubricant starvation, resulting in the formation of a thin lubricant film of insufficient thickness [15][16][17][18]. The latter occurs because of high sub-surface stresses which can result in inelastic deformation in the bulk of the solid when sufficiently high stresses coincide with any existing pores, inclusions or flaws.…”

Section: Introductionmentioning

confidence: 99%

Non-Newtonian Thermo-Elastohydrodynamics and Sub-Surface Stress Field of High-Performance Racing Spur Gears

et al. 2022

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Meshing teeth pairs of involute spur gears often form the final drive of high-performance motorsport transmissions. They are subject to high normal and shear loading. Under transient conditions pertaining to a meshing cycle, the contact conditions alter from the onset of teeth pair engagement through to maximum normal loading, followed by contact separation. Sliding motion only ceases instantaneously at the pitch point. The regime of lubrication remains mostly in non-Newtonian thermo-elastohydrodynamic conditions. The results show that a starved inlet boundary is attained throughout most of the meshing cycle which leads to the diminution of the pressure spike at the exit from the contact conjunction. The reversing sub-surface shear stresses are the main source of the onset of any inelastic deformation, which is dominated by the primary pressure peak in compliance with the Hertzian maximum pressure. The shear stress field is supplemented by an induced field due to the presence of the pressure spike. Under starved conditions this secondary stress field is diminished. The combined solution of elastohydrodynamics with a thermal network model, non-Newtonian lubricant traction, and sub-surface stress evaluation provides for a comprehensive solution not hitherto reported in the literature.

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Section: Introductionmentioning

confidence: 99%

Non-Newtonian Thermo-Elastohydrodynamics and Sub-Surface Stress Field of High-Performance Racing Spur Gears

et al. 2022

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Determination of Critical Temperature of Scuffing for AISI 8620 Steel Gear Contacts Lubricated by Dexron 6 Through Computational Simulation of Experiment

Kolivand

Wei

2022

Journal of Tribology

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This study establishes the critical temperature of scuffing for contacts of gears made of AISI 8620 steel alloy, lubricated by Dexron 6 oil. Through thermal mixed EHL modeling, experimental scuffing failures are simulated to determine the associated maximum surface temperature, which consists of bulk and flash components. This temperature is referred as the limiting/critical temperature of scuffing, and is believed to be independent of operating conditions, while vary for different solid material and lubricant pairs [1-4]. It is found sump lubricant temperature rise affects surface temperature by contributing to the bulk component. The flash component is largely dictated by asperity interactions within contact zone, where Hertzian pressure is not an appropriate measure of micro-scale asperity contact loading. The observed scuffing scars are shown to be in good agreement with the high temperature zone predicted by the computational model.

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Point Contact Thermal Mixed Elastohydrodynamic Lubrication Under Short-Period Intermittent Motion

Zhang

Yao

Wang

et al. 2023

Journal of Tribology

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To improve mechanical efficiency, the tribological performance of short period intermittent motion needs to be investigated. Based on the theory of thermal elastohydrodynamic lubrication (EHL) and considering the influences of rough surface, a mixed-EHL model under point contact simple sliding intermittent motion is established. Using this model, the transition from mixed-EHL to EHL in the contact area is realized by changing the period of intermittent motion and setting the surface roughness. It is found that the thermal effect in simple sliding intermittent motion should not be ignored, and the pressure, temperature rise distribution and friction coefficient during the stop and start-up are fluctuated obviously. Under the condition of rough surface contact, the contact area will enter the mixed-EHL state during the stop and start-up. Shortening the period of intermittent motion is beneficial to alleviate the adverse effect of the mixed-EHL.

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An Investigation on Starvation Onset of Rough Surface Line Contacts

Cited by 4 publications

References 33 publications

Non-Newtonian Thermo-Elastohydrodynamics and Sub-Surface Stress Field of High-Performance Racing Spur Gears

Non-Newtonian Thermo-Elastohydrodynamics and Sub-Surface Stress Field of High-Performance Racing Spur Gears

Determination of Critical Temperature of Scuffing for AISI 8620 Steel Gear Contacts Lubricated by Dexron 6 Through Computational Simulation of Experiment

Point Contact Thermal Mixed Elastohydrodynamic Lubrication Under Short-Period Intermittent Motion

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