Tribological study of crankshaft bearing systems: Comparison of forged steel and cast iron counterparts under start–stop operation

Summer, Florian; Grün, Florian; Schiffer, Jürgen; Gódor, István; Papadimitriou, Ilias

doi:10.1016/j.wear.2015.06.022

Cited by 22 publications

(15 citation statements)

References 10 publications

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“…The tests were conducted by the use of a Bearing Segment Test Adapter (BSTA) in combination with a rotary tribometer TE92 from Phoenix Tribology (Basingstoke, UK). This setting has been a reliable testing facility throughout recent years allowing detailed investigations of friction and wear processes of a simplified journal bearing contact while granting a close link to industrial applications [5,24,25]. The investigated journal bearing specimens depict a multilayer structure of which the wear process of the top sliding layer, which consists of a PbSn based material is of interest.…”

Section: Methodsmentioning

confidence: 99%

“…These regimes are characterized by the coexistence of hydrodynamic and asperity contact pressure where the latter is generally responsible for increased frictional losses, wear and a higher chance of failure. On the one hand, these circumstances demand a continuous further development of the tribological partners shaft and journal bearing material as well as the lubricant by experimental investigations [2][3][4][5][6][7][8][9]. On the other hand, the prediction of wear based on numerical investigations becomes increasingly important especially in the course of the design process and the evaluation of life expectancy [10,11].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Methodsmentioning

confidence: 99%

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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“…a typical journal bearing contact on reduced model scale, the JBA expands the areas of application to the fluid friction regime in a close-to-component contact. The investigation possibilities of the RoD setting incorporate friction as well as wear investigations on lubricants and interaction of materials [33][34][35]. The contact area and the loading forces are small in comparison to industrial applications.…”

Section: Methodsmentioning

confidence: 99%

Expansion of the Metrological Visualization Capability by the Implementation of Acoustic Emission Analysis

Bergmann

Grün

Summer

et al. 2017

Advances in Tribology

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The acquisition and evaluation of acoustic emissions (AE) in tribology have proven to be a meaningful tool for condition monitoring and offer possibilities to deepen the understanding of tribological processes. The authors used this technology with the aim of expanding existing test methodologies towards increased visualization capability of tribological processes and investigated the correlation between tribological processes and acoustic emissions on a Ring-on-Disc and a close-to-component journal bearing test setting. The results of this study include the description of friction as well as wear processes and prove the usability of several AE evaluation parameters whereby a close correlation between AE and tribological processes can be shown. Consequently, it was possible to expand the visualization and evaluation capabilities of the test settings offering additional insights by making use of AE.

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“…In addition to the experimental investigation [1][2][3][4][5], the simulation of lubricated contacts is an important tool for the design process of tribological systems for different applications [6][7][8][9][10]. For the calculation of the hydrodynamic lubrication, the Reynolds equation is commonly used [11].…”

Section: Introductionmentioning

confidence: 99%

A Novel Approach for Modeling Surface Effects in Hydrodynamic Lubrication

et al. 2018

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Abstract:The common approach for the flow factor calculation is based on using the Reynolds equation to simulate the micro-level flow. However, for structured surfaces the fluid flow cannot be represented correctly, due to the assumptions made when deriving the Reynolds equation. In this work, a novel method using the Navier-Stokes equations for the calculation of the micro-level flow is presented and validated against results from Patir and Cheng. The three-dimensional lubrication gap was generated by a rough Gaussian random surface and a perfectly smooth moving counter surface, in order to be available for different numerical methods. The presented results illustrate similar trends for both the approaches. Additionally, the use of the Navier-Stokes equations allows for the observance of surface induced effects which cannot be resolved by the approach of Patir and Cheng. Furthermore, a numerical approach for a shear flow factor calculation with a rough moving surface is presented and validated against other simulation methods. While the validation is maintained with pressure-and temperature-independent density and viscosity, these effects will be taken into account for later research activities of textured surfaces.

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Tribological study of crankshaft bearing systems: Comparison of forged steel and cast iron counterparts under start–stop operation

Cited by 22 publications

References 10 publications

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

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

Expansion of the Metrological Visualization Capability by the Implementation of Acoustic Emission Analysis

A Novel Approach for Modeling Surface Effects in Hydrodynamic Lubrication

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