Einfluss von Schmierstoffsystemen auf die Ermüdungsbeanspruchbarkeit von Schraubenverbindungen

The fatigue behavior of bolted joints is critical to failure for many applications due to the high notch effect. Among other parameters, the life-time is based on the influence of the surface system, consisting of coating and lubricant. Intended to consider the surface system in the design and dimensioning process of bolted joints systematic experimental investigations are carried out for an exemplary selected basecoat and various lubricant systems. The basis is given by fatigue tests supported by selected methods of material analysis for the fractographic evaluation. A reproducible method to determine the crack initiation as well as the crack propagation has been developed for the evaluation of lubricant systems.