Dear students,
Some calls for proposals may still be in preparation. Initiative enquiries can be directed to the academic staff if you cannot find a suitable thesis here.
Investigation of the fatigue behaviour of duplex steel as a function of the manufacturing process
The fatigue behaviour of a duplex steel (1.4462) in the high-cycle fatigue range is to be investigated as part of this work. Duplex steel consists of equal proportions of austenitic and ferritic phases, with a good combination of mechanical properties and corrosion resistance. The samples are available in a conventionally cast state and in two additively manufactured states. The aim is to investigate the fatigue behaviour in load increase and single-stage tests and to carry out comprehensive characterisation depending on the manufacturing process using microstructural analyses.
Contact: Constanze Backes
Frequency dependence of plastic deformability during ultrasonic welding of metals
Ultrasonic welding is an innovative and promising joining technique for hybrid material systems. The joining of dissimilar material types is interesting for high-performance structures, e.g. in electronics or aviation. The plastic deformability of metallic joining partners during the process is a basic prerequisite for a successful process and the production of robust welded joints. This work therefore aims to investigate the plastic deformation of metal-safe materials during the ultrasonic welding process as a function of the working frequency.
Contact: Moritz Liesegang
In-process parameter program for ultrasonic metal welding
Ultrasonic welding is an established process in many areas of industry. Due to the outstanding electrical properties of ultrasonically welded mixed metal composites, demand has been increasing rapidly for some time, particularly in the field of electromobilisation. The control technology of commercial ultrasonic welding systems is often limited to essential functions. A variable process control was developed at the WKK, with which parameter programmes are to be developed during the welding process as part of this work in order to further improve the composite properties.
Contact: Moritz Liesegang