Predicting fatigue life for finite roller contacts based on a mixed EHL model using realistic surface roughness

Liu, Mingyong; Wu, Chenhui; Yan, Chunai

doi:10.1007/s12206-017-0630-2

Cited by 9 publications

(5 citation statements)

References 21 publications

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“…In the Homogeneous Equilibrium Model (HEM), the lubricant is considered a homogeneous mixture of liquid and vapour, described by a single set of mass and momentum equations. The mass conservation of the lubricant mixture is given by (1) (7) 𝛼 𝑙 = 1 − 𝛼 𝑣 Here, 𝜌 𝑙,𝑠𝑎𝑡 and 𝜌 𝑣,𝑠𝑎𝑡 are the density of the liquid and vapor phases at the saturation pressure. The compressibility of the mixture can be defined by different models [57], but in this work, the following linear relation is assumed…”

Section: Homogenous Equilibrium Modelmentioning

confidence: 99%

A quantitative analysis of double-sided surface waviness on TEHL line contacts

Havaej

Degroote

Fauconnier

2023

Tribology International

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Section: Homogenous Equilibrium Modelmentioning

confidence: 99%

A quantitative analysis of double-sided surface waviness on TEHL line contacts

Havaej

Degroote

Fauconnier

2023

Tribology International

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“…In the current study, the stress-based fatigue life model proposed by Zaretsky [22] has been utilized for fatigue life prediction. is fatigue model has been widely adopted by the other research groups [11,13,21]. e model can be expressed as…”

Section: Fatigue Life Prediction Modelmentioning

confidence: 99%

“…Torabi et al [12] proposed a mixed EHL model of a finite length cam and follower mechanism considering surface roughness and studied the influence of thermal effects, end leakage, and roughness on the friction performance. Liu et al [13] established a mixed EHL model of a finite line contact by using realistic surface roughness and predicted the influence of working conditions and lubrication parameters on the fatigue life. Liu et al [14,15] developed a starved EHL model for a spur gear pair and discussed the influence of working condition parameters on the friction coefficient and mechanical power loss.…”

Section: Introductionmentioning

confidence: 99%

Predicting Fatigue Life for Finite Line Contact under Starved Elastohydrodynamic Lubrication Condition

Liu

Zhang

et al. 2020

Mathematical Problems in Engineering

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Surface contact fatigue is the main failure mode in many mechanical components, such as gears, bearings, and cam-followers. A fatigue life prediction model is proposed for finite line contact under starved thermal elastohydrodynamic lubrication (TEHL) condition in this paper. Then, the effects of inlet oil-supply thickness, slide-to-roll ratio (SRR), and operating conditions on the lubrication performance and fatigue life are investigated. The results show that the lubrication characteristics and fatigue life of finite line contact are obviously different from those of fully flooded situation by introducing the starved lubrication condition. For example, the severe starved conditions lead to a significant increase in friction coefficient and decreased fatigue life. The variation of SRR has an important influence on the fatigue life. With the increase of SRR, the fatigue life decreases firstly and then increases. The stress concentration occurs near the surface when speed is low. In addition, under the low-speed situation, rotation speed variation has little effect on the fatigue life.

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“…7 Computational tests helped the evaluation of both lubrication correction factors proposed in DIN 281:2010. 8 In Liu et al 9 discusses the relevance of lubricant film given the load parameters and influence of the average surface roughness on the shear stress present on the contact. A comparison between the calculation of fatigue life with dry contact and lubricated contact was presented in Soares et al 10 Numerical simulation showed that the presence of lubrication allows longer bearing life when the contacts are lubricated.…”

Section: Introductionmentioning

confidence: 99%

Optimized selection of fluid lubricant for cylindrical roller bearings under elastohydrodynamic lubrication

Soares

Tsuha

Cavalca

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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Roller bearings are widely used in machinery. Keeping the contact surfaces of bearings properly lubricated strongly mitigates wear effects, improving bearing fatigue life. Therefore, systematically selecting the lubricant fluid that satisfies bearing operation conditions allows the lubricating layer to be able to carry the applied load, the operating temperature, and the roughness on contact. The nonlinear constrained optimization method is used for lubricant selection, seeking to find the fluid that best fits the bearing operation conditions. Roller bearing lubrication is characteristically elastohydrodynamic (EHL); namely, the Hertz theory describes the load applied on the contacts of a cylindrical roller bearing, and the Stribeck condition classifies the tribological condition of the surfaces in contact. This work concludes that roughness and speed are the most important parameters to consider when choosing a fluid lubricant.

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Predicting fatigue life for finite roller contacts based on a mixed EHL model using realistic surface roughness

Cited by 9 publications

References 21 publications

A quantitative analysis of double-sided surface waviness on TEHL line contacts

A quantitative analysis of double-sided surface waviness on TEHL line contacts

Predicting Fatigue Life for Finite Line Contact under Starved Elastohydrodynamic Lubrication Condition

Optimized selection of fluid lubricant for cylindrical roller bearings under elastohydrodynamic lubrication

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