eesti teaduste
akadeemia kirjastus
Estonian Journal of Engineering
A study of third body behaviour under dry sliding conditions. Comparison of nanoscale modelling with experiment; pp. 270–278
PDF | doi: 10.3176/eng.2012.3.12

Andrey I. Dmitriev, Werner Österle, Heinz Kloß, Guillermo Orts-Gil

Automotive brake pads consist of many components but it is still not entirely clear which role each of the elements of this complex composition plays to provide the specified regimes of sliding. This is due to the mutual interaction of multiscale mechanisms, realized during the friction. In this work we have attempted to partly answer this question using computer simulations. Since the simulation allows us to consider various combinations of the structure of the system being simulated ceteris paribus, it becomes possible to understand the role of each constituent sequentially. The main attention is paid to the structure and composition of the thin film that forms on the surface of both bodies as a result of compaction of the wear product, its chemical com­position and oxidation. This layer, also named a third body or friction film, differs in composition and microstructure from the two first bodies. We considered a single contact for the steady state sliding when the structure and composition of friction films already are formed. As a modelling tool we used the method of movable cellular automata, which has well proven itself in solv­ing of such tasks. We investigated the influence of modification of the structure and com­position of the third body on the features of system behaviour at friction. To assess the adequacy of the numerical model, experimental studies with an artificial third body were also carried out. The simulation results are in good agreement with experimental data.


  1. Godet, M. The third body approach: a mechanical view of wear. Wear, 1984, 100, 437–452.

  2. Singer, I. L. How third body processes affect friction and wear. MRS Bull, 1998, 29, 37–40.

  3. Psakhie, S. G., Horie, Y., Ostermeyer, G. P., Korostelev, S. Yu., Smolin, A. Yu., Shilko, E. V., Dmitriev, A. I., Blatnik, S., Špegel, M. and Zavšek, S. Movable cellular automata method for simulating materials with mesostructure. Theor. Appl. Fract. Mech., 2001, 37, 311–334.

  4. Dmitriev, A. I. and Österle, W. Modeling of brake pad-disc interface with emphasis to dynamics and deformation of structures. Tribol. Int., 2010, 43, 719–727.

  5. Österle, W., Prietzel, C., Kloß, H. and Dmitriev, A. I. On the role of copper in brake friction materials. Tribol. Int., 2010, 43, 2317–2326.

  6. Potyondy, D. O. and Cundall, P. A. A bonded-particle model for rock. Int. J. Rock Mech. Mining Sci., 2004, 41, 1329–1364.

  7. Dmitriev, A. I., Österle, W. and Kloß, H. Numerical simulation of mechanically mixed layer formation at local contacts of an automotive brake system. Tribol. Trans., 2008, 51, 810–816.

  8. Eriksson, M., Lord, J. and Jacobson, S. Wear and contact conditions of brake pads: dynamic in situ studies of pad on glass. Wear, 2001, 249, 272–278.

  9. Österle, W., Bresch, H., Dörfel, I., Prietzel, C. and Seeger, S. Surface film formation and dust generation during brake performance tests. In Proc. IMECHE-Conference Braking. York, UK, 2009. Chandos Publishing, Oxford, 2009, 29–38.

10. Hinrichs, R., Soares Marcio, R. F., Lamb, R. G. and Vasconcellos, M. A. Z. Phase characteriza­tion of debris generated in brake pad coefficient of friction tests. Wear, 2011, 270, 515–519.

11. Kato, H. Severe-mild wear transition by supply of oxide particles on sliding surface. Wear, 2003, 255, 426–429.

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