Possible impacts of third body nanostructure on friction performance during dry sliding determined by computer simulation based on the method of movable cellular automata

Österle, Werner; Дмитриев, А. И.; Kloß, H.

doi:10.1016/j.triboint.2011.11.018

Cited by 48 publications

(31 citation statements)

References 37 publications

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“…The modelling results provide an explanation why the mixing of soft pad ingredients with magnetite, the major wear product from the brake disc, results in smooth sliding at a COF of at least 0.35. Furthermore, it was shown that the COF increases by adding approximately 5 vol % of a hard nanoconstituent, e.g., ZrO 2 , SiC or Al 2 O 3 [94,95], or by a decrease of the applied pressure [91,92]. Thus, smooth sliding within a COF-range of 0.35-0.5 is predicted by the model for tribofilm nanostructures fulfilling the mentioned requirements.…”

Section: Discussionmentioning

confidence: 93%

The Role of Solid Lubricants for Brake Friction Materials

Österle

Дмитриев

2016

Lubricants

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This review article comprises of three parts. Firstly, reports of brake manufacturers on the beneficial impact of solid lubricants for pad formulations are surveyed. Secondly, since tribofilms were identified to play a crucial role in friction stabilization and wear reduction, the knowledge about tribofilm structures formed during automotive braking was reviewed comprehensively. Finally, a model for simulating the sliding behavior of tribofilms is suggested and a review on modelling efforts with different model structures related to real tribofilms will be presented. Although the variety of friction composites involved in commercial brake systems is very broad, striking similarities were observed in respect to tribofilm nanostructures. Thus, a generalization of the tribofilm nanostructure is suggested and prerequisites for smooth sliding performance and minimal wear rates have been identified. A minimum of 13 vol % of soft inclusions embedded in an iron oxide based tribofilm is crucial for obtaining the desired properties. As long as the solid lubricants or their reaction products are softer than magnetite, the main constituent of the tribofilm, the model predicts smooth sliding and minimum wear.

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Section: Discussionmentioning

confidence: 93%

The Role of Solid Lubricants for Brake Friction Materials

Österle

Дмитриев

2016

Lubricants

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“…The studied fragment of PHYSICAL MESOMECHANICS Vol. 17 No. 4 2014 the surface layer is modeled as a rectangle with the given boundary conditions of symmetry at three sides and one free surface at the top side.…”

Section: Macroscalementioning

confidence: 99%

Modeling of nanostructuring burnishing on different scales

et al. 2014

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The operating characteristics of machine parts and units are defined in many respects by the physical and mechanical properties of their surface layers. Unfortunately, it is still not quite clear what parameters and mechanisms are responsible for one or another modification of surface layer properties. In this context, computer modeling techniques can be a useful tool in studying the variation of surface properties in contact interaction and run-in. Of fundamental importance is the possibility to consider the processes occurring on nanoscales and scales of individual atoms. In the work, loading conditions in plastic surface deformation was reproduced on the macroscale (traditional approach), atomic scale, and mesoscale by computer modeling with the finite element method, movable cellular automata method, and molecular dynamics method. The modeling results are in good qualitative agreement with data of experimental measurements.

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“…A great deal of studies had been concentrated on the effects of third body in friction and wear properties of friction material. Experimental evidences had confirmed that the presence of third body as well as their formation and evolution greatly affects the tribological properties of friction materials [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 94%