Tribological functionality of aluminium sliding materials with hard phases under lubricated conditions

Grün, Florian; Summer, Florian; Pondicherry, Kartik; Gódor, István; Offenbecher, Martin; Lainé, Emmanuel

doi:10.1016/j.wear.2012.11.048

Cited by 14 publications

(5 citation statements)

References 11 publications

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“…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%

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: 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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“…The ball specimens were slid against AlSi12CuNiMg (T6) under 15 N. Figure 6b shows less aluminum adhered to the steel ball surface and a sulfur-containing tribofilm was formed on the ball. This indicates that large silicon grains in AlSi12CuNiMg (T6) supported normal load and avoided direct contact between the aluminum matrix and the steel surface [17,27], resulting in no aluminum adhesion. The results of Figs.…”

Section: Friction Properties Of Aluminum Alloys Slid Against Bearingmentioning

confidence: 99%

Running-in for Low Friction between Silicon-Containing Aluminum Alloy and Bearing Steel in Engine Oil

Ihara

Adachi

2023

Tribology Online

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The friction properties of an aluminum-silicon alloy (Al-Si) can be improved by increasing its silicon content. However, this can deteriorate the material properties necessary for engine components. Therefore, an alternative approach to reduce friction is required. This study investigated the running-in behavior, the reduction of friction from the initial to the stable phase of sliding, between Al-Si with varying silicon contents and bearing steel in fully formulated engine oil. The friction of Al-Si and the silicon-free aluminum alloy (Al) was classified into three modes: no friction reduction (mode I), friction reduction after a high-friction period (mode II), and immediate friction reduction (mode III). Al exhibited only mode I, low-silicon-content Al-Si mainly displayed mode II, and high-siliconcontent Al-Si mainly exhibited mode III. Energy-dispersive X-ray spectroscopy revealed that, for mode II, zinc dithiophosphate (ZnDTP) reacted with the aluminum matrix, suppressing aluminum adhesion and forming molybdenum-dithiocarbamate-derived tribofilm. Nanoindentation and micro-Vickers tests demonstrated that the initial high hardness of the Al-Si matrix did not increase the ZnDTP reactions. However, the friction-induced hardened layer on the matrix promoted the ZnDTP reactions, suggesting that forming the hardened layer is a key factor in the low-friction interface of Al-Si without increasing silicon content.

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Tribological functionality of aluminium sliding materials with hard phases under lubricated conditions

Cited by 14 publications

References 11 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

Running-in for Low Friction between Silicon-Containing Aluminum Alloy and Bearing Steel in Engine Oil

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