High-frequency fatigue testing system

• Subject Area: Materials Engineering
• Term: Funded in 2019
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 424760282

With the high-frequency fatigue testing system, the possibilities of cyclic material and component testing in the Faculty of Mechanical Engineering of the TU Dortmund University in the very high cycle fatigue (VHCF) regime are significantly extended. This systemic expansion allows characterizing metals and plastics in the VHCF regime up to a maximum force of 50 kN under various stress ratios and temperatures. The high-frequency fatigue testing system will be used in ongoing and planned research projects as well as in experimental student works and experimental laboratories to investigate fatigue behaviour at high and very high number of cycles. Due to the variability in the clamping of flat and round specimens as well as complex component-like specimens, e.g., additively manufactured cellular structures or hybrid laminates, it will enable the load- and cycle-dependent determination of cyclic deformation and damage mechanisms and thus (first) to provide comprehensive design parameters for these materials and structures in the VHCF regime. In addition, the influence of production processes, e.g., by examining components, manufactured at the Institute of Machining Technology (ISF), can be investigated with regard to their VHCF properties for feedback them to institutes of production engineering for the further development of processes. The focus lies on a better understanding of the process-structure-property relationships, which enable a property-optimized production of components, which are loaded in the VHCF regime during operation.

• DFG Programme: Major Research Instrumentation
• Major Instrumentation: Hochfrequenz-Schwingprüfsystem
• Instrumentation Group: 2910 Dynamische Prüfmaschinen und -anlagen, Pulser
• Applicant Institution: Technische Universität Dortmund
• Leader: Professor Dr.-Ing. Frank Walther