Investigation of particle-influenced high load contacts

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Friction and wear are crucial factors in the design of most technical systems. Particularly in the case of dry contacts, a very close interaction between the formation, transport, and accumulation of wear particles on the contact surfaces along with the associated friction coefficients can be observed. For example, the formation of characteristic structures from compressed wear material under the influence of heat is a process that determines tribological properties. The corresponding dynamic properties that bring about the observed behavior are not yet fundamentally understood. Systematic investigations that take a comprehensive view of these particle dynamics, including dependencies on their properties, and link them to global measurement variables of the friction contact have not yet been carried out, and are the subject of the proposed research project. The aim of the project is to gain a deeper understanding of these dynamic effects in the friction boundary layer, and to correlate these dynamics with the observed friction forces. Particular emphasis is placed on investigations into the influence of particle properties (e. g. size and elasticity), the mixing ratio of several particle types, the surfaces used, and the magnitude of loading. For this purpose, studies are carried out on multiple tribometers of the applicant’s Institute. Various measurement arrangements spanning a wide range of parameter values are used to observe the influence of defined parameters on particle motion, and to investigate the influence of these parameters on real tribological experiments. By combining the measuring methods, it is possible to combine the generic findings of the respective tests and thus gain new insights into the process dynamics of wear-resistant friction contacts.