Electrodynamic Linear torsion testing machine

• Subject Area: Production Technology ; Materials Engineering
• Term: Funded in 2023
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 524805243

The fatigue behavior of a material is generally composed of the material properties and its microstructure, the manufacturing parameters, and the applied loading conditions. Dynamic stresses are often the cause of component failure. However, it is difficult to reproduce the complex stress state that exists under real conditions on the component in the laboratory. Multi-axial stress conditions occur in various application areas, for example in medical technology (e.g., hip prostheses), energy technology (e.g,. wind turbine blades), aviation (e.g., empennage) and the sports industry (e.g., running shoes) Due to a lack of testing technology, uniaxial loading conditions are often investigated and the behavior under multi-axial loading is derived from this. This procedure is usually based on highly simplified assumptions that rarely correspond to reality. In addition to the actual testing technique, there is also a lack of understanding of the damage processes that occur under multi-axial loading and the corresponding material modeling. As a result, components are not optimally designed, and high safety factors must be applied. A more sustainable and resource-efficient component design as well as consistent lightweight construction can thus currently not be implemented in numerous application areas. This gap is to be closed by the proposed testing device and it will enhance the research activities. The large-scale research equipment applied for will enable multi-axial testing of specimens and components under static and dynamic cyclic loading with forces of up to 10 kN and torsional moments of up to 100 Nm. The integrated thermographic camera enables the detection of initial material damage as well as the possibility of adaptive frequency control to expand the scientific interpretation possibilities and ensure more efficient and faster material testing. In addition, the connection of the electrical dynamic testing machine to a continuous, traceable process chain of material development enables continuous, standardized data access. This creates new (research) opportunities for faster and higher-quality evaluation of new materials and processes. For example, process data, formulations and material properties can be linked, and complex relationships identified using digital methods. This takes into account the current trends towards increasingly complex material formulations (e.g., the use of recycled and bio-based materials), new manufacturing technologies, ever shorter development cycles and longer product lifetimes.

• DFG Programme: Major Research Instrumentation
• Major Instrumentation: Elektrodynamische Linear-Torsion-Prüfmaschine
• Instrumentation Group: 2910 Dynamische Prüfmaschinen und -anlagen, Pulser
• Applicant Institution: Universität Bayreuth
• Leader: Professor Dr.-Ing. Holger Ruckdäschel