Non-destructive testing
Various infrared cameras (Micro-Epsilon TIM450/400, Infratec ImageIR® 8300) Measuring systems for thermocouples and thermistors (National Instruments, Keysight) Uni- and bipolar current sources from Toellner/Kepco for electrical resistance measurement Barkhausen noise measurement systems (QASS Optimizer µMag
Evaluation of the frequency influence on the fatigue behaviour of unalloyed steels
Fatigue life prediction methods (LPV) developed at WWHK in recent years have so far been limited to the transition between LCF (Low Cycle Fatigue) and HCF (High Cycle Fatigue) and to the HCF regime. This has recently led to controversial discussions regarding the ut
Two factors in particular must be considered here. Relevant damage mechanisms can change from the HCF to the VHCF regime. For example, the crack initiation points shift into the volume in the field of defects, such as inclusions and precipitates, especially in the case of high-strength conditions. In the case of ductile materials, damage developm
Use of the electrochemical potential to characterize the surface damage behavior of cyclically loaded materials
As part of the research project, a corrosion measuring set-up is to be set up and integrated into a fatigue testing system (rotating bending machine and/or vibration testing system) so that electrochemical investigations can be carried o
For the first experiments in distilled water, a miniaturized electrochemical in-situ cell with a standard three-electrode system, which is also used in potentiodynamic polarization measurements, is being developed. The challenge here is that the cell must be sealed at the sample shafts so that cyclic loading of the specimen can occur in the cell
For this purpose, measurements on fatigue specimens are carried out on the steel 20MnMoNi5-5 in a service relevant heat treatment condition, in which the residual stresses are determined conventionally using an X-ray diffractometer and then the results are used in order to calibrate the µmagnetic measuring system.The surface roughness is measured
