False brinelling - standstill marks on roller bearings (English)

Viennano, Vienna International Conference on Micro- and Nano-Technology, 4, ECOTRIB, European Conference on Tribology, 3
; 2011
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All tests conducted so far and the bibliography confirm the hypothesis that standstill marks develop due to various mechanisms: (1) The lubricant is literally pushed out of the friction area by micro movement and high local pressure. This leads to a lack of lubricant and the typical wear mechanisms of abrasion and adhesion ("galling"). (2) The micro movement activate the surface energy (in particular the microcon-tacts on the surface roughness peaks). This leads to tricobchemical reactions down to a depth of several nanometres. (3) Another important factor which is often not considered and can hardly be detected on superficial inspection is the microcracks caused by tangential forces due to the load changing on the surface (Contact mechanical theory of MINDLIN). When exposed to further load, these cracks result in more extensive and deeper particle break-off. The three damage mechanisms described above cause the production of wear particles and reaction products, which are not pushed out of the friction area due to a lack of "real" relative movement and thus have a strong abrasive effect. This phenomenon correlates with the formation of fretting corrosion (tribochemical corrosion) and normally leads to damage progression and deep indentations which cover the traces of the original damage mechanism. In further damage progression and bearing rotation there are additional wear mechanisms (in particular abrasion and surface disruption), which overlap and add to the covering of the real cause of damage. Depending on the predominance of one or several of the mechanisms described above, there are different types of standstill marks. The predominance of one mechanism depends on the load conditions - and within those mainly from the oscillation angle. Another damage factor with strong influ-ence is the lubricant used. Due to their better flow properties, oils are in general more effective than greases in preventing damage due to lack of lubrication. Oils may also be more suitable when it comes to preventing tribochemical corrosion as oils achieve more reliable surface wetting and thus prevent the formation of dry friction oxides (Fe2O3), which, due to their abrasiveness, lead to quickly progressing damages. One big problem is that the term "false brinelling" covers a wide variety of dam-age symptoms, which are partly caused by different mechanisms. The wear symptoms in tests with microoscillation differ significantly from the tests with relatively wide oscillation movements in the range of above 1°, as in the normal laboratory testing methods, such as the Fafnir or SNR test (Fafnir: +/- 6°; SNR test: +/-3°). Such macro-scopic oscillation movement leads to "real" bearing processes and not to the micro movements which occur and are particularly problematic with seemingly motionless bearings. Based on contact mechanical theories it will be possible to calculate the stresses in the tribological contact. These theories can help to explain why only a few load changing cycles with loading far beyond the critical value can cause such massive damage. We will soon conduct computer simulations and FEM calculations to investigate influencing parameters. Future test bench setups will be designed to either confirm or disprove the existing hypotheses. Furthermore, the project members devel-oping lubricant formula are working on concepts for improvement. But at this point of time we do not know yet if lubricants have an influence on the wear mechanism in surface disruption. The examinations conducted so far show the complexity of wear damage due to the overlapping of all four main wear mechanisms. It is thus extremely difficult to find suitable lubricants for damage prevention.

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Table of contents conference proceedings

The table of contents of the conference proceedings is generated automatically, so it can be incomplete, although all articles are available in the TIB.

25
Fuel economy of engine oils based on polyalkylene glycols
Merryweather, S. / Zweifel, D. / Woydt, M. | 2011
67
Increasing energy-efficiency of hydrodynamic journal bearings by closed-loop lubrication flow control and condition monitoring
Albers, A. / Nguyen, H.T. / Burger, W. | 2011
83
Rheological and tribological investigation of a mesogenic fluid with ultralow friction
Amann, T. / Kailer, A. | 2011
97
Influence of biodiesel fuels on lubricity of passenger car diesel engine oils
Petraru, L. / Novotny-Farkas, F. | 2011
105
Ionic liquids based on imidazolium with functionalized alkyl chain as new lubricants
Kaldonski, T.J. / Ozimina, D. / Cudzilo, S. / Durejko, T. / Gocman, K. / Zasada, D. / Kaldonski, T. | 2011
113
Tribological evaluation of tetraethylen glycol functionalized ionic liquids
Pagano, F. / Zare, P. / Bayon, R. / Binder, W. / Fernandez, X. / Igartua, A. | 2011
143
Electron beam surface engineering of aluminium alloys and its influence on microstructure - property relationships
Klemm, M. / Zenker, R. / Haase, I. / Franke, R. | 2011
149
Effects of abrasive environment on the wear resistance of steels
Just, C. / Peissl, S. / Ilo, S. | 2011
159
Effect of tribosystem rigidity and inertia on run-in behaviour of PVD coating
Antonov, M. / Adoberg, E. / Hussainova, I. / Goljandin, D. / Zikin, A. | 2011
177
Investigation of wear resistance of spark plasma sintered Co/WC and cBN/Co/WC composites
Yaman, B. / Mandal, H. | 2011
189
Tribological behavior of Al-Si polyester abradable coatings
Koutsomichalis, A. / Vaxevanidis, N.M. / Mourlas, A. / Psyllaki, P. | 2011
225
Advanced ceramics as friction material in lubricated clutch systems
Albers, A. / Bernhardt, J. / Ott, S. | 2011
243
Effects of PTA-processing variables on microstructure formation and abrasion resistance of MMC
Ilo, S. / Katsich, C. / Badisch, E. | 2011
313
Investigation of the tribological behaviour of PTFE composite materials and the effect of its microstructure
Daubner, A. / Deuschle, J. / Haas, W. | 2011
321
Mechanical mixing during running-in under lubricated conditions
Optatzy, W. / Pöhlmann, K. | 2011
347
A numerical model for investigating mixed lubricated systems taking into account adhesion effects and surface roughness
Albers, A. / Lorentz, B. | 2011
377
Model of deformation contribution from total friction force for textile fabrics
Camillieri, B. / Baussan, E. / Bueno, M.A. / Derler, S. / Rossi, R. | 2011
409
False brinelling - standstill marks on roller bearings
Grebe, M. / Feinle, P. / Blaskovits, P. | 2011
441
Load-carrying capacity prediction of different plasma nitrided, case-hardened and quenched specimens under rolling contact loading
Trausmuth, A. / Godor, I. / Stoschka, M. / Dietrich, A. / Eichsleder, W. | 2011
521
Multichannel optical sensor for oil film pressure measurement in engine main bearing
Ronkainen, H. / Hokkanen, A. / Kapulainen, M. / Stuns, I. / Varjus, S. / Turunen, R. / Nyyssönen, S. / Halme, J. | 2011
629
Analysis of the lubricant flow in a main bearing shell
Offner, G. / Herbst, H. / Mahmoud, K. / Baier, W. | 2011
639
Influences on no-load gear losses
Höhn, B.R. / Michaelis, K. / Otto, H.P. | 2011
681
Cavitation in porous journal bearings lubricated with ionic liquids
Neacsu, A. / Scheichl, B. / Eder, S. / Vorlaufer, G. | 2011
709
Novel methodology for the calculation of local loadings in lubricated heterogeneous tribosystems
Krampl, H. / Grün, F. / Godor, I. | 2011
739
Tribology of piston skirt conjunction
Littlefair, B. / Howell-Smith, S. / Theodossiades, S. / King, P.D. / Rahnejat, H. | 2011
747
Microtribological evaluation of unlubricated sliding bearings with thin Si3N4 and PTFE coatings
Pape, F. / Cvetkovic, S. / Kiesow, A. / Kailer, A. / Rissing, L. | 2011
763
Tool-workpiece interactions for hot forming and forging applications
Tomala, A. / Winkelmann, H. / Badisch, E. | 2011
771
High temperature wear influenced by micro and nanostructural material properties - extended summary and explanation of wear mechanism of dendritic precipitations
Winkelmann, H. | 2011
785
Tribological aspects and energy consumption in ballroom dance as a human activity
Marinkovic, A. / Zunjic, A. / Pejic, D. / Stankovic, M. | 2011
839
Lubricant molecular chain length effects on the friction of diamond-like carbon contacts
Velkavrh, I. / Kalin, M. | 2011
855
Nano-electrochemical characterization of CoCrMo biomedical alloy by EQCM and XPS
Vidal, C.V. / Mischler, S. / Olsson, C.O.A. / Munoz, A. Igual | 2011
885
Investigation of alcohol adsorption on DLC surfaces using AFM and tribological experiments
Kalin, M. / Simic, R. | 2011

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