Surface initiation of rolling contact fatigue at asperities considering slip, shear limit and thermal elastohydrodynamic lubrication

Everitt, Carl-Magnus; Alfredsson, Bo

doi:10.1016/j.triboint.2019.04.023

Cited by 17 publications

(9 citation statements)

References 48 publications

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“…Under the coupling effect of entrainment velocity and thermal effect, the interfacial shear force with negative slip is smaller than that with positive slip. is conclusion is consistent with reference [26]. Figure 11 shows the distribution of subsurface stress field along the z direction on the sections x � 0 and y � 0 with the SRR ξ � 0.0, 0.5, 1.0.…”

Section: Effect Of Slide-to-roll Ratiosupporting

confidence: 89%

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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Section: Effect Of Slide-to-roll Ratiosupporting

confidence: 89%

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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“…A method was developed for manufacturing single asperities integrated into the hard contact surfaces of rolling contact discs for use in experimental investigations of the influence of single asperities on rolling contact fatigue (RCF) in hard lubricated and rolling contacts. The method is important for the experimental verification of the asperity point load mechanism for RCF [1] , [2] , [3] , [4] , [5] which suggests a plausible model for the initiation of surface initiated RCF.…”

Section: Methods Introductionmentioning

confidence: 99%

An imprint method to produce surface asperities for EHL and RCF experiments

2021

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A method was developed for creating single well-defined surface asperities using an imprint technique. The proposed method enables: Creation of well-defined micrometre high asperities Creation of asperities which survived more than 35 million EHL contact cycles Damage tracing thanks to the possibility to control the damage initiation sites. The technique is based on rolling a hard disc with indents against a soft disc for creating single surface asperities. The contact pressure causes plastic deformation forcing material into the indents to create the asperities. The height of the asperities can be controlled by adjusting the applied force. After initial reshaping during the run-in process, the asperities were strong enough to survive more than 35 million elastohydrodynamic lubrication cycles, which should be of great interest for the researchers who investigate rolling contact fatigue experimentally. The method could also aid the research on the run-in process by enabling tracing the development of specific surface defects. Since the method can produce high and strong asperities it might also prove useful for investigations how asperities deform under sever contact conditions.

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“…2. A more detailed description has been provided by Everitt and Alfredsson in their article from 2019 [11].…”

Section: Numerical Setupmentioning

confidence: 99%

Investigation of the asperity point load mechanism for thermal elastohydrodynamic conditions

Everitt

Alfredsson

2019

MATEC Web Conf.

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The rolling contact fatigue damage called pitting or spalling develops more frequently in surfaces with negative than positive slip. Since normal line loads do not cause any tensile surface stresses this investigation considers the effects of small point shaped asperities. Shear traction causes tensile stresses at the trailing edge of asperities entering the contact at negative slip. At positive slip the tensile stresses appear at the leading edge when the asperities exit the contact. It was found that the trailing edge of the asperity breaks through the lubrication film at contact entry. This causes negative slip to be more detrimental than positive slip. At negative slip the location of large frictional shear stresses and tension stresses from normal asperity contact coincide.

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Surface initiation of rolling contact fatigue at asperities considering slip, shear limit and thermal elastohydrodynamic lubrication

Cited by 17 publications

References 48 publications

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

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

An imprint method to produce surface asperities for EHL and RCF experiments

Investigation of the asperity point load mechanism for thermal elastohydrodynamic conditions

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