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Use of µmagnetic test methods for the evaluation of the damage evolution in metallic materials subjected to cyclic loading
In order to achieve the goal of a (residual) fatigue life calculation for metallic materials or structures, it is necessary that comprehensive information is determined and made available. This information describ
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In the case of a pressurized pipeline filled with superheated steam or supercooled water, it must be assumed after a certain operating time that the local scatter of the material properties specific to the loads continuously increases.
The effects of such influences are currently covered in general terms by safety factors in t
Quantified evaluation of the frequency influence on the fatigue behavior of unalloyed steels for implementing in resource-efficient fatigue life prediction methods
For a reliable service life prediction, it is necessary to determine comprehensive material information that takes into account the microstructure and the associated material mechanisms
MibaLeb is expected to make a decisive contribution to this. The overall goal of the second project phase is to transfer the results, findings and methods to real and actually loaded materials and components in order to provide reliable information on the integrity and remaining service life of nuclear power plants.The aim of the WWHK subproject
Tissue engineering of cells in complex hydrogels using three-dimensional electrical and magnetic stimulation
The project is located in the field of tissue engineering. Tissue engineering refers to the production of tissue replacements in the laboratory. The aim is the production of intestinal wall analogue tissue from muscle and nerve cells
As part of the planned research project, fatigue specimens of the steels C22R and 20MnCrS5 will be subjected to conastant amplitude loading with different stress and total strain amplitudes. Within the framework of conventional fatigue tests, it is first of all not possible to make reliable statements with regard to macrocrack formation and propa
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
Following this characterization, the damaged volume is removed from the specimen, which is polished and then subjected to secondary loading on various test systems at test frequencies of 5, 60, 200 and 1000 Hz. In the HCF range, a direct comparison with the original undamaged specimens can thus be derived. In the VHCF range, possible deviations i
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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
Characterisation of materials and structures by means of scanning electron microscopy and EDX, EBSD and STEM analysis
Within the scope of the research project funded by the DFG, a high-resolution scanning electron microscope with EDX, EBSD and STEM detectors as well as an external FIB will be procured and scientific staff will be provided to opera
