Oberflächenmodifikationen in geschmierten Kontakten - ein Multiskalenansatz zur Verschleiß- und Reibungsbewertung

Translated title of the contribution: Surface modifications in lubricated contacts ¿ A multiscale approach for wear- and friction assessment

Michael Maier

Research output: ThesisDoctoral Thesis


Without lubricated contacts, numerous machines of everyday use would not operate in the desired way. In times of global climate change, enhancing the efficiency of lubricated contacts is a major task. On the one hand, there is the possibility of increasing efficiency through specific actions, e.g. in the form of interimisitic stops, or low-viscosity lubricants. Due to the system properties of the contact, this may lead to detrimental operating conditions, which result in an operating condition in the mixed friction regime and, subsequently, in wear. On the other hand, friction can be reduced by artifcial surface textures. Appropriate models are required for the holistic design of a lubricated contact. Different size scales are relevant for lubricated contacts. In order to describe this, several submethodologies are obligatory. In the micromodel, the surface topography is characterized. The microhydrodynamics and the solid contact pressure are the relevant parameters from the micromodel, for which corresponding simulation models were created. The transition of the surface topography from the initial state to the run-in state was analyzed using simulation models. For the macroscopic wear simulation, on the example of a hydrodynamic journal bearing, a local approach was used, where the wear-dependent surface topography was implemented in the form of a variable micromodel. Parameters for the quantification of wear were determined on a decoupled gathering system. Simulation models based on different sets of equations were created to examine the effect of surface textures on the hydrodynamics. The validation was performed on a novel test rig with a pin on disc configuration to investigate textured lubricating wedges. The combination of the individual sub-methods enables wear simulation in textured contacts considering wear-dependent surface topographies. The validation of the wear simulations with experiments shows the significance of the weardependent surface topography on the wear development. The potential of artificial surface textures for friction reduction was demonstrated with both the simulation methodology and the novel test rig. In addition to a design tool, the presented methodology enables the development of a deeper understanding of the wear processes and mechanisms of surface textures in lubricated contacts.
Translated title of the contributionSurface modifications in lubricated contacts ¿ A multiscale approach for wear- and friction assessment
Original languageGerman
Awarding Institution
  • Montanuniversität
  • Stoschka, Michael, Assessor A (internal)
  • Pechstein, Astrid, Assessor A (external), External person
  • Grün, Florian, Supervisor (internal)
  • Brand, Clemens, Co-Supervisor (internal)
Publication statusPublished - 2024

Bibliographical note

no embargo


  • Contactsimulation
  • Wear
  • Surface textures
  • Finite Elements
  • Multiscalesimulation

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