A theoretical study of ionic liquid lubricated μ-EHL line contacts considering surface texture

Thakre, Gananath D.; Sharma, Satish C.; Harsha, S. P.; Tyagi, Mukti

doi:10.1016/j.triboint.2015.08.001

Cited by 16 publications

(5 citation statements)

References 44 publications

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“…Habchi et al investigated the effects of thermo-mechanical properties of coatings on friction in elastohydrodynamic contacts, and studied the underlying physical mechanisms governing friction variations [15]. As for the micro-EHL on rough surface, Thakre et al discussed the micro-EHL behavior of seven different ionic liquids in textured surface of concentrated engineering contacts and benchmarked the performance of ionic liquids against smooth surface and Newtonian rheology [16]. Masjedi et al investigated the effect of surface roughness in point-contact EHL and derived the formulas for predicting the central film thickness, minimum film thickness, and the asperity load ratio [17].…”

Section: Introductionmentioning

confidence: 99%

Normal and tangential oil film stiffness of modified spur gear with non-Newtonian elastohydrodynamic lubrication

Zhou

Xiao

Chen

et al. 2017

Tribology International

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A new normal stiffness model of the oil film is established by the viscous-elastic fluid between a spur gear drive being equivalent to a massless spring element, and the tangential stiffness model is proposed according to the hypothesis of equal shear stress on laminar element surfaces. Effects of operating parameters (contact force and rotation speed) and geometry parameters (module, tooth number，pressure angle and modification) on the oil film stiffness from the root to the tip are investigated. The results show that the amplitude and fluctuation of the stiffness are closely related to the shear rate, effective viscosity and curvature radii. It is indicated that the rational parameter match is valid in mesh impact reduction and stationarity enhancement.

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Section: Introductionmentioning

confidence: 99%

Normal and tangential oil film stiffness of modified spur gear with non-Newtonian elastohydrodynamic lubrication

Zhou

Xiao

Chen

et al. 2017

Tribology International

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“…The static deterministic roughness patterns are shown in Figure 3. The mathematical form of these roughness pattern are expressed in equation ( 7) (Gananath et al, 2016) as:…”

Section: Film Thickness Equationmentioning

confidence: 99%

Effect of surface roughness and deformation on Rayleigh step bearing under thin film lubrication

Kumar

Azam

Ghosh

et al. 2017

ILT

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Purpose The aim of this paper is to study the effect of deterministic roughness and small elastic deformation of surface on flow rates, load capacity and coefficient of friction in Rayleigh step bearing under thin film lubrication. Design/methodology/approach Reynolds equation, pressure-density relationship, pressure-viscosity relationship and film thickness equation are discretized using finite difference method. Progressive mesh densification (PMD) method is applied to solve the related equations iteratively. Findings The nature and shape of roughness play a significant role in pressure generation. It has been observed that square roughness dominates the pressure generation for all values of minimum film thickness. Deformation more than 100 nm in bounding surfaces influences the film formation and pressure distribution greatly. Divergent shapes of film thickness in step zone causes a delay of pressure growth and reduces the load capacity with decreasing film thickness. The optimum value of film thickness ratio and step ratios have been found out for the maximum load capacity and minimum coefficient of friction, which are notably influenced by elastic deformation of the surface. Practical implications It is expected that these findings will help in analysing the performance parameters of a Rayleigh step bearing under thin film lubrication more accurately. It will also help the designers, researchers and manufacturers of bearings. Originality/value Most of the previous studies have been limited to sinusoidal roughness and thick film lubrication in Rayleigh step bearing. Effect of small surface deformation due to generated pressure in thin film lubrication is significant, as it influences the performance parameters of the bearing. Different wave forms such as triangular, sawtooth, sinusoidal and square formed during finishing operations behaves differently in pressure generation. The analysis of combined effect of roughness and small surface deformation has been performed under thin film lubrication for Rayleigh step bearing using PMD as improved methods for direct iterative approach.

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“…Their results indicate that transverse waviness provide the best lubrication capability. Thakre et al [21] conducted theoretical research on the impact of surface textures with various waveforms on the lubricating behavior of ionic liquids. The results highlight that the texture pattern and material combinations significantly affect micro-EHL contact behavior.…”

Section: Introductionmentioning

confidence: 99%

Effect of Groove Structure on Lubrication Performance of Water-Lubricated Stern Tube Bearings

Zhang

2023

Lubricants

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This study investigated the lubrication characteristics (i.e., the groove ratio and width) of water-lubricated stern tube bearings, based on the flexibility matrix method and lubrication theory. Considering the elastic deformation of the lining, a fluid structure interaction (FSI) model of the surface micro-groove texture of a water-lubricated stern tube bearing was established, and the correctness and rationality of the model were verified by experiments. Micro-grooved, surface-lubricated, water-lubricated stern tube bearings with three different cross-sectional shapes (rectangular, circular, and triangular) were designed. The influences of the groove area ratio and width on the bearing load-carrying capacity and friction coefficient were analyzed. At a groove area ratio of 0.31, the load-carrying capacity of the rectangular grooved stern tube bearing reached the maximum value and the friction coefficient reached the minimum value. It is recommended to design and use water-lubricated stern tube bearings, especially Thordon water-lubricated stern tube bearings, with rectangular micro-grooves, with a groove area ratio of 0.30–0.32, so that the best lubrication performance can be obtained. With the increase in the micro-groove width, the lubrication of water-lubricated stern tube bearings with partial rectangular micro-grooves is significantly better than that of others. Under the same conditions, the bearing load-carrying capacity and friction performance of local groove stern bearings is significantly better than that of global groove stern bearings.

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A theoretical study of ionic liquid lubricated μ-EHL line contacts considering surface texture

Cited by 16 publications

References 44 publications

Normal and tangential oil film stiffness of modified spur gear with non-Newtonian elastohydrodynamic lubrication

Normal and tangential oil film stiffness of modified spur gear with non-Newtonian elastohydrodynamic lubrication

Effect of surface roughness and deformation on Rayleigh step bearing under thin film lubrication

Effect of Groove Structure on Lubrication Performance of Water-Lubricated Stern Tube Bearings

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