Effect of surface roughness on lubricant film breakdown and transition from EHL to mixed lubrication

Křupka, Ivan; Šperka, Petr; Hartl, Martin

doi:10.1016/j.triboint.2015.12.008

Cited by 44 publications

(25 citation statements)

References 34 publications

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“…Equivalent elastic modulus E 1 Young's modulus of half-space E 2 Young's modulus of spherical contact e ij Eigenstrains F Galerkin vectors F x 1 Friction force along x 1 direction G Constant, G = (1 − ν 1 ) ( …”

Section: Dimensionless Burial Depth E'mentioning

confidence: 99%

“…Friction and wear between contact surfaces are extremely critical in this situation, and higher load capacities and smaller friction are in great demand for improving mechanical efficiency. As a special form of hydrodynamic lubrication, elastohydrodynamic lubrication (EHL) often appears in high-stress contact friction pairs [1][2][3] and can be used to describe the lubrication mechanism of point and line contact friction pairs. The EHL occurs on the surface of the composites, considering a series of particles [4][5][6] inside the composite, the particles can be expressed as cube regions that subjected to eigenstrains.…”

Section: Introductionmentioning

confidence: 99%

“…Finally, the results for the EHL traction coefficient demonstrate that appropriate particle properties, size, burial depth, and interparticle distance can effectively reduce the traction coefficient in heavy-load contact. © 2018 Author (s) Half-width of contact area C Constant, C = 1 − 2ν 1 …”

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confidence: 99%

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Elastohydrodynamic lubrication in point contact on the surfaces of particle-reinforced composite

Chen

Zeng

et al. 2018

AIP Advances

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Appreciable friction and serious wear are common challenges in the operation of advanced manufacturing equipment, and friction pairs may be susceptible to damage even with oil lubrication when point contact exists. In this study, a type of particle-reinforced composite material is introduced for one of the components of a heavy-load contact pair, and the performance improvement of elastohydrodynamic lubrication (EHL) is analyzed considering the rheological properties of non-Newtonian fluids. The Ree–Eyring EHL model is used considering the surface of the particle-reinforced composite, in which the film thickness includes the particle-induced elastic deformation. The problem of inclusions with different eigenstrains is solved by using Galerkin vectors. The influences of particle properties, size, burial depth, and interparticle distance on point-contact EHL are investigated. Furthermore, using several cases, the structural parameters of the particles in the composites are optimized, and an appropriate parameter range is obtained with the goal of reducing friction. Finally, the results for the EHL traction coefficient demonstrate that appropriate particle properties, size, burial depth, and interparticle distance can effectively reduce the traction coefficient in heavy-load contact.

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Section: Dimensionless Burial Depth E'mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Elastohydrodynamic lubrication in point contact on the surfaces of particle-reinforced composite

Chen

Zeng

et al. 2018

AIP Advances

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“…The CE will travel with the speed of the lubrication instead of the speed of the irregularity. Křupka et al showed with experiments that point and line indents can cause lubrication breakdown due to CE effect [27]. Křupka et al states that the ratio between the minimum lubrication height and the surface roughness, called the lambda ratio, is not alone sufficient to always determine the lubrication regime and the fatigue risk.…”

Section: Introductionmentioning

confidence: 99%

Contact fatigue initiation and tensile surface stresses at a point asperity which passes an elastohydrodynamic contact

Everitt

Alfredsson

2018

Tribology International

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Contact mechanics and tribology was combined with fundamental fatigue and fracture mechanics to form a new mechanism for surface initiated rolling contact fatigue. Following, fatigue was investigated numerically for single asperities and craters in lubricated rolling contact surfaces. The hypothesis suggests that asperity point contacts can create sufficiently large tensile stresses for fatigue. The investigated case corresponded to a heavily loaded truck gear with ground surfaces. Reynolds equation resolved the elastohydrodynamic effect of the asperity in the transient three dimensional contacts. The Findley critical plane criterion was used for multiaxial and non-proportional fatigue evaluation. The simulations confirmed the new mechanism for rolling contact fatigue and showed how asperities can create contact fatigue in the lubricated contacts even without slip.

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“…from the perspective of the surface topography [4], [5]. Moreover, the microstructures such as pits, bulges and scratches in surface topography are the key factors influencing the thickness of the lubricant film and the friction and wear features for the friction pair surface [6]- [8]. No matter the optimization of the grinding process or the analysis on friction and wear characteristics of the surface, the investigation of the surface topography is an inevitable trend.…”

Section: Introductionmentioning

confidence: 99%

Non-destructive 3D Topography Modeling Based on Surface Profile Measurement Data

Kang¹,

Tang²

2018

IJCEE

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Due to the limitations on the size and properties of samples, most of the surface topography tests are destructive and the contrast test of the surface morphology before and after friction and wear of the same workpiece cannot be carried out by the topography instruments. In addition, the destructive test increases the test period and the research cost, as well. In order to solve the above problems, a non-destructive surface topography measurement method is proposed in this paper. The 3D surface topography model of the workpiece surface can be established by the processing of the surface height distribution characteristics obtained by the surface profiler. It includes the discrete point reorganization, concentric processing, moving average filtering, equal length processing and other pre-processing and the post-processing like regression analysis, polynomial interpolation. Compared with the surface topography obtained by the topography instrument, it is found that the 3D surface topography model established not only characterize the surface features such as dents, bulges, and scratches accurately and effectively but also avoid the complex sample preparation processes. What is more, the surface topography of the workpiece can be acquired without destructing and the comparison test of the surface topography before and after friction and wear of the same workpiece can be conducted.Wencheng Tang received the B.S. degree from Nanjing Institute of Technology in 1982, the M.Sc. and the Ph.D. degrees from Southeast University in 1987. From 2008 to 2014, he was the dean of the School of Mechanical Engineering. His main research directions are CAD/CAE/CAM, computer integrated manufacturing system, researches on friction and wear of functional components and static and dynamic analysis and optimization design of structural parts.

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Effect of surface roughness on lubricant film breakdown and transition from EHL to mixed lubrication

Cited by 44 publications

References 34 publications

Elastohydrodynamic lubrication in point contact on the surfaces of particle-reinforced composite

Elastohydrodynamic lubrication in point contact on the surfaces of particle-reinforced composite

Contact fatigue initiation and tensile surface stresses at a point asperity which passes an elastohydrodynamic contact

Non-destructive 3D Topography Modeling Based on Surface Profile Measurement Data

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