Edge loading and running-in wear in dynamically loaded journal bearings

Sander, David Emanuel; Allmaier, Hannes; Priebsch, Hans-Herwig; Reich, Franz Markus; Witt, Mario; Skiadas, Athanassios; Knaus, Oliver

doi:10.1016/j.triboint.2015.07.022

Cited by 59 publications

(40 citation statements)

References 25 publications

(35 reference statements)

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“…The presented results give an overview of current research by the authors. The majority of the results are taken from recent publications and, therefore, we refer to the original publications for further reading [42,43,47,48,53].…”

Section: Simulation Resultsmentioning

confidence: 99%

“…The parameters for the contact model used in this study are derived from scans of the bearing surface and the shaft surface. The detailed surface parameters are described in [42,43].…”

Section: Fundamentals Of Mixed Elasto-hydrodynamic Lubrication Theorymentioning

confidence: 99%

“…Hence, the shaft and bearing shell surfaces are scanned and analysed. For a detailed derivation of the roughness parameters see [42].…”

Section: Running-in Caused By Edge Loading and Iterative Wear Calculamentioning

confidence: 99%

See 2 more Smart Citations

Friction and Wear in Automotive Journal Bearings Operating in Today’s Severe Conditions

Sander¹,

Allmaier²,

Priebsch³

2016

Advances in Tribology

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A current trend in the transport sector seeks to increase the vehicle efficiency and to cut fuel consumption which leads to new technologies and advancements in modern and future combustion engines. Some of these technical progresses lead to highly stressed engine parts and new challenges arise, particularly for journal bearings. The increasing thermal and mechanical load caused by downsized and turbocharged engines, friction reduction by employing low-viscosity lubricants and other emission reduction measures-for utilizing stop-start systems-put additional stress on the crankshaft journal bearings. This contribution focuses on highly stressed journal bearings which operate in the boundary, mixed and hydrodynamic lubrication regime. Therefore, measurements on a journal bearing test-rig are performed which allow an extensive verification of the numerical investigation. For the numerical analysis of friction and wear, a mixed elasto-hydrodynamic simulation approach is developed, which considers the elastic deformation of the contacting components, the complex rheological behaviour of the lubricant and metal-metal contact if the lubricant is unable to separate the contacting surfaces. Both the rheological data and the surface roughness parameters are obtained from measurements. The current challenges are studied in four application-oriented examples and the influencing parameters on a reliable friction and wear prediction are explored.

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Section: Simulation Resultsmentioning

confidence: 99%

“…The parameters for the contact model used in this study are derived from scans of the bearing surface and the shaft surface. The detailed surface parameters are described in [42,43].…”

Section: Fundamentals Of Mixed Elasto-hydrodynamic Lubrication Theorymentioning

confidence: 99%

See 1 more Smart Citation

Friction and Wear in Automotive Journal Bearings Operating in Today’s Severe Conditions

Sander¹,

Allmaier²,

Priebsch³

2016

Advances in Tribology

Self Cite

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“…Metal-metal contact was also identified by simulation. As a consequence research on the running in process of journal bearings was conducted [33,34]. Complementary, the presented results are obtained from the same simulation approach yet discuss friction in severe mixed lubrication regime.…”

Section: Figure 1: Sketch Of a Stribeck Curve With Different Lubricatmentioning

confidence: 86%

Simulation of journal bearing friction in severe mixed lubrication – Validation and effect of surface smoothing due to running-in

Sander

Allmaier

Priebsch

et al. 2016

Tribology International

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107

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This paper focuses on the friction behavior of journal bearings operating from hydrodynamic to mixed lubrication regime where severe metal-metal contact occurs. Therefore, friction tests with two different static loads are carried out on the journal bearing test-rig from KS Gleitlager. The test results in form of Stribeck curves provide a solid base to proof the isothermal elastohydrodynamic simulation approach. The simulation approach solves the averaged Reynolds equation introduced by Patir and Cheng and considers metal-metal contact by using the Greenwood and Tripp contact model. All necessary surface parameters are derived from surface scans. No less essential in this approach are the experimentally identified lubricant properties under high pressure and high shear rate.The calculated friction torque matches the measurement results within the measurement uncertainty for a wide range of operation conditions. With the validated simulation approach the influence of surface smoothing due to metal-metal contact is discussed. Additionally, the limits of a constant boundary coefficient are identified and the effects of flow factors are presented.

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“…Studied literature reveals that predominantly unlubricated contacts were the object of investigations in this regard. The evaluation of wear under lubricated conditions and operation in mixed lubrication was for example investigated by Sander et al [20]. The authors demonstrated the adoption of the journal bearing surface under edge loading during the running in process.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Wear Phenomena of Journal Bearings by Close to Component Testing and Application of a Numerical Wear Assessment

et al. 2018

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Hydrodynamic journal bearings are subjected to progressively rough loading conditions leading to an increased share of operation in mixed and boundary lubrication. This results in increased frictional losses, additional wear and a higher chance of failure, which calls for the understanding of wear processes and the necessity of a numerical assessment. We conducted wear investigations of journal bearings by making use of a close-to-component test setting, and the progress of wear could be linked to the introduced frictional energy and in combination with a comprehensive surface analysis tribological effects could be resolved in detail. Achieved wear coefficients were implemented in a novelly developed numerical framework, which allows for the dynamic numerical evaluation of operation in the fluid and mixed lubrication regime and simultaneously occurring wear processes. By comparing numerical and experimental results, we evaluated the numerical framework's capability to conduct holistic simulations including aspects like dynamically changing operation conditions, fluid and mixed lubrication as well as wear.

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Edge loading and running-in wear in dynamically loaded journal bearings

Cited by 59 publications

References 25 publications

Friction and Wear in Automotive Journal Bearings Operating in Today’s Severe Conditions

Friction and Wear in Automotive Journal Bearings Operating in Today’s Severe Conditions

Simulation of journal bearing friction in severe mixed lubrication – Validation and effect of surface smoothing due to running-in

Evaluation of Wear Phenomena of Journal Bearings by Close to Component Testing and Application of a Numerical Wear Assessment

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