Abstract
Abstract The coefficient of friction, which determines the process force in the micro range, can be described by a pressure dependent friction function. In this work, this friction function is transferred into a contact length-dependent one. The resulting course is characteristic for lubricated contact of two bodies in relative motion to each other. This allows to identify solid friction and mixed friction during forming. Moreover, these areas can be used to identify a minimum contact length of lC,min = 17 μm at the transition from solid to mixed friction, in accordance with roughness measurements. This point is also found for different punch velocities, which proves that there is a minimum contact length required to form so-called lubrication pockets improving the friction behaviour of two contact partners. Thus, this work presents a method that numerically, analytically and experimentally determines the effective size of lubrication pockets of a given material with a given surface structure.
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