The boundary layer dynamics between the brake pad and disk are the primary source of the dynamic friction behavior of automotive brakes (1). A key component of this friction interface is the influence of mesoscopic surface contact structures known as patches, upon which the friction power is concentrated, and whose sizes vary with time. Through these dynamic processes, time and load history-dependent effects come about, which cause, for example, the brake moment behavior commonly observed in an AK-Master test. In recent years, several simulation tools have been developed in order to predict the complex friction behavior caused by the patch dynamics in the friction boundary layer. Such simulations are often based on a two or three-dimensional spatial grid, where the explicit physical phenomena at all locations in the boundary layer are modeled by time-consuming calculations of local material dependent balance equations.
Ostermeyer, Georg-Peter, Merlis, Joshua, TU Braunschweig, Institute of Dynamics and Vibrations