Istvan Gódor

The Fatigue Behaviour of a High Strength CrNi-Steel Regarding Fretting Fatigue

In many assemblies of moving components, contact problems under various lubrication conditions are lifetime-limiting. There, relative motion of contacting bodies, combined with high loads transmitted via the contact surface lead to fretting fatigue failure. For a reliable prediction of in service performance load type, different damage and failure mechanisms that may be activated during operation have to be known. In this contribution selected results of a currently conducted research project are presented. The aim of this study was to examine the material behaviour of a surface stressed steel. The influence of the fretting regime on fatigue properties has been investigated.Copyright

Test Methods to Visualize the Break-Down Behaviour of Sliding Bearing Materials

In the context of this work, testing methods of model scale size have been developed, which are based on the ring-on-disc system. These methods enable the visualization of the events in the sliding materials during operation and subsequent breakdown with high time resolution. Therefore, it is possible to visualize and analyze the events taking place at the time of failure. The new test method was benchmarked using the materials AlSn20Cu, CuPb22Sn2 and SnSb7.5Cu3.5. The resulting data enabled the generation of models that characterize the events of the different tribo-materials. Therefore, the proposed method supports the trial-and-error approach of material optimization.Copyright