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F. Franek, G. Vorlaufer, A. Stadler, M. Jech, T. Wopelka:
"Modelling and Simulation Assisted Tribometrology";
Tribology in Industry, 30 (2009), 3 & 4; 37 - 47.

Stick-Slip phenomena in wet jhction disc systems used in drive trains of modern vehicles can cause vibration or noise which considerably decrease comfort of drives and passengers. For the investigation and characterization of these phenomena, a disc-on-disc tribometer is used at the Austrian Center of Competence or Tribology. A method is presented which is based on a combination of additional sensor technology on the tribometer and computer simulation and
allows for determination of dynamic as weil as static coefficient of friction during dynamic stick-slip experiments. Examples and interpretations illustrate the presentation of the method. For advanced and sound understanding of wear processes, especially with respect to piston rings, it is necessary to measure the corresponding wear height or wear volume accurately. Applying radio active isotopes is a very powerful tool to investigate wear behaviour of tribosystems, which are difficult to access, and the only reasonable tool for investigations at real nanometer scale. The nVCT® method (nanoscale wear Volume Coherence Technology) aims at the nanometer sensitiveness and simultaneously assures easy and safe use. To achieve
this ambitious goal, fundamental 1a1Owiedge about the irradiation process and the concentration of isotopes in the very thin surface layer of interest have to be obtained. The application of this method advantageously refers to modelling of system behaviour as to the
lubricant circuit and modelling of the contact conditions. The wear processes can be analysed and modelled in terms of running-in behaviour and "progressive" wear characteristics. The methods are illustrated based on the characterization of lubricity of ATF fluids.
The paper focuses on the requirements of selected fields of tribometrology and shows specific solutions of evaluation of test conditions and test results.

tribometrology, simulation, dynamic experiments, friction coefficient determination, nano wear measurement

Project Head Friedrich Franek:
Tribologie