Abstract
Friction behavior in a sliding contact is strongly influenced by the surface topography of the bodies in contact. This also applies to friction clutches. Even small differences in surface topography may cause significant differences in friction behavior. Thus, it is important to be able to characterize the micro-contact of the rough sliding surfaces, which are, in the case of a clutch, steel plate and friction material. One important measure for the characterization of the micro-contact is the real area of contact. Another important aspect is the contact pattern. The article introduces a method to implement a FEM (Finite Element Method) model from real surface measurements. Real surface topography of the friction pairing is considered. The simulation method is applied to different friction pairings and operating conditions. Computational results with rough and smooth steel plates, new and run-in friction linings, and different nominal surface pressure verify the model. In addition, the results on real area of contact between a steel and a friction plate are compared with published values.
Highlights
Friction behavior in a sliding contact is significantly determined by the conditions in the micro-contact of the bodies involved
The real area of contact is closely linked to the local loads and to the functional and damage behavior of the clutch
The friction behavior of wet friction clutches is significantly determined by the conditions in the micro-contact of the steel and the friction plate
Summary
Friction behavior in a sliding contact is significantly determined by the conditions in the micro-contact of the bodies involved. The surface topography of the friction pairing plays an important role. This applies to the friction contact of wet friction clutches. The functional behavior and shifting comfort of a clutch mainly depend on its friction behavior and among other factors, on the surface properties of the steel plates and friction plates. Even small differences in surface topography, e.g., a different grinding structure on the steel disc surface, can lead to significant differences in the friction behavior of the clutch. We carried out several experimental investigations on the influence of steel plate topography on the friction behavior of the clutch, especially in the running-in phase [1,2,3].
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