Tuesday, 12 October 2004 - 2:15 PM

This presentation is part of : Wear and Tribology

Performance prediction and simulation of material behaviour in tribological systems

Heinz Kloss1, Erich Santner2, and Mathias Woydt1. (1) Federal Institute for Materials Research and Testing, Unter den Eichen 44-46, Berlin, D-12203, Germany, (2) Federal Institue for Materials Research and Testing, Unter den Eichen 44-46, Berlin, D- 12203, Germany

It is important in many fields of technology to reduce or control friction and wear. There are requirements to extend lifetime, efficiency and safety of engines and devices. A performance prediction represents a tool to give answers in this field of requirements before expensive testing. By using wear modelling, surface topography, mechanical contact conditions (elastic, plastic) and surface temperature calculation in dependence of operating conditions as well as thermo physical properties and surrounding conditions, a prediction of the performance for materials in high speed (turbines, machinery) and low speed (human joint) application will be presented. To understand elementary processes of friction and wear in mechanical systems material behavior under normal and tangential forces is important. Contact formation, development and breakage take place in areas of nano- and micrometers. MCA (Movable Cellular Automata) method provides the full necessary information about response of different homo- and heterogeneous materials, composites and layers under uniaxial compression, indentation and sliding conditions. Due to mobility of the separate automata the MCA method allows to simulate different processes ongoing in the real materials, in particular: formation and accumulation of damages, grinding and penetration effects, fracture processes, fragmentation, formation of pores and cracks, simulation of friction and wear. Using metallic and ceramic bulk materials 2D and 3D MCA computer simulations for indentation and sliding (scratch) tests will be represented on a meso scale.

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