Prediction of Contact and Lubrication Characteristics of Micro-textured Surface Under Thermal Line Contact EHL

Zhao, Jiang; Li, Zhengminqing; Zhou, Hong; Zhu, Rupeng

doi:10.3389/fmech.2021.672588

Cited by 4 publications

(3 citation statements)

References 38 publications

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“…The loading conditions are: Hertzian stress of 728 MPa, and entrainment velocity of 3 m/s. The subsurface stress of the model in this article is calculated to be 402 MPa, while the maximum surface stress reported in Zhao et al’s study 45 is 408 MPa. Therefore, the equivalent stress in this article and its relative error is false(408−402false)/402=1.5%, which proves that the approach is available.…”

Section: Resultsmentioning

confidence: 55%

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Modeling and analysis of 3D mixed lubrication in marine cam–tappet pair

Hua,

Shi,

Sun

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part J:

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During the operation of the marine cam–tappet pair, affected by periodic dynamic load, transient velocity, and micromorphology, it usually operates in a mixed lubrication state. Under extreme operational conditions, contact is likely to occur at the asperity of the interface, leading to problems such as stress concentration and dry contact. Considering the transient dynamics and three-dimensional roughness of cam–tappet pair, a mixed-elastohydrodynamic lubrication model is developed in this article, while the effects of surface waviness on the lubrication state are also investigated. The results show that the film thickness can be increased by 0.098 μm, and the coefficient of friction can be reduced by 10.6% when the wavelength ratio ranges from 1/6 to 6. However, when the amplitude exceeds 0.6 μm, the coefficient of friction may reach 0.10. Under conditions of low speed and high load, the film thickness decreases and contact load ratio increases. And about 30% reduction in film thickness is achieved on cam–tappet pair, potentially leading to increased wear or scuffing failure.

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Section: Resultsmentioning

confidence: 55%

“…The results for the subsurface stress are compared with those found in Zhao et al’s study, 45 focusing specifically on the smooth subsurface stress. The loading conditions are: Hertzian stress of 728 MPa, and entrainment velocity of 3 m/s.…”

Section: Resultsmentioning

confidence: 96%

Modeling and analysis of 3D mixed lubrication in marine cam–tappet pair

Hua,

Shi,

Sun

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part J:

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show abstract

“…In fact, wear can also affect many operating characteristics of mechanical systems, such as vibration and noise levels, load-bearing capacity and friction [3][4][5]. Surface morphology is an important feature of wear parts, and its evolution during wear will directly affect the contact performance between the surfaces of mechanical parts, and have an important impact on the stability and reliability of the mechanical system [6,7]. A comprehensive grasp of the changes in the surface micro-geometric morphology during the wear process will provide a basis for the fault diagnosis, state recognition and wear resistance evaluation of mechanical equipment.…”

Section: Introductionmentioning

confidence: 99%

Fractal variation of three-dimensional surface topography during sliding wear under mixed elastohydrodynamic lubrication

Zhao

wang

et al. 2021

Surf. Topogr.: Metrol. Prop.

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The surface morphology variation of the friction pair during the wear process directly affects the local lubrication effect and contact strength, and this variation is difficult to quantify in mixed lubrication. In this study, a numerical simulation and characterization model method of sliding wear surface morphology evolution based on deterministic elastohydrodynamic lubrication (EHL) model and surface three-dimensional morphology fractal method is established. The effectiveness of the lubrication model is verified by the film thickness measurement, and the actual surface wear coefficient is obtained through the wear experiment. On this basis, the variation of surface morphology and fractal parameters in the sliding wear process is investigated, and the effect of contact load and sliding speed on surface lubrication characteristics and fractal parameters is analyzed. The results show: wear will cause the higher wave peaks on the ground surface to be gradually worn away and the fine structure of the surface is reduced, and the fractal dimension of the morphology is therefore reduced. In addition, the contact area ratio and contact load ratio, as well as the coefficient of friction and surface evolution under different loads and sliding speeds are consistent.

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Study on the Lubrication Characteristics of Spur Gear Pairs With Low Sliding Ratio Under Mixed Elastohydrodynamic Lubrication

Zhao¹,

Sheng²,

Li³

et al. 2022

Journal of Tribology

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The relative sliding at the meshing point directly affects the contact and lubrication characteristics of the gear pair, and is the main cause of gear wear and power loss. In this research, for investigation of a new type of low sliding ratio (LSR) gear pair whose tooth profile is constructed by a cubic function, a Three-dimensional (3D) mixed EHL line contact model was established with consideration of the effect of tooth profile geometry, transient motion characteristics, load distribution and machining roughness. The distribution of the center film thickness of the LSR gear along the meshing line was predicted through an example the result of which was compared with a typical line contact EHL formula to verify the model. In addition, the difference was investigated in film thickness distribution, of friction coefficient and temperature rise between LSR spur gears and involute spur gears. Basing on above, there was discussion about the effect of 3D rough tooth surface on the contact lubrication characteristics of LSR gears. The results demonstrated that the minimum center film thickness of the LSR gear appeared at the alternating point of the concave and convex tooth surfaces. At the same time, compared with the involute gear, the LSR gear significantly increased the film thickness at the start and ending points of the meshing, and reduced the friction coefficient and the flash temperature rise.

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Prediction of Contact and Lubrication Characteristics of Micro-textured Surface Under Thermal Line Contact EHL

Cited by 4 publications

References 38 publications

Modeling and analysis of 3D mixed lubrication in marine cam–tappet pair

Modeling and analysis of 3D mixed lubrication in marine cam–tappet pair

Fractal variation of three-dimensional surface topography during sliding wear under mixed elastohydrodynamic lubrication

Study on the Lubrication Characteristics of Spur Gear Pairs With Low Sliding Ratio Under Mixed Elastohydrodynamic Lubrication

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