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Research project (§ 26 & § 27)
Duration : 2021-01-01 - 2022-09-30

Objective of the Project is the system-integrated and load dependent evaluation of the long-term reliability of high-speed turnouts, with focus on crack initiation and growth from the rail foot of moveable crossing points. The Project focuses on the development of a detailed understanding of the dynamics of the complete non-linear system comprising “wheelset – rail – slab track – soil”, capturing on one hand the influence of slab, concrete asphalt mortar and soil stiffness, and on the other hand the low-amplitude, high-cycle vibrations from wheel-rail contact on the loading of the switch rails. Ultimately, the cornerstones for an integrated maintenance concept for high-speed crossings should be provided. The Present Project itself is part of the jointly defined Research Programme of the COMET K2 Center on “Integrated Computational Material, Process and Product Engineering (IC-MPPE)” and supports reaching the goals defined in this Research Programme. The contribution by BOKU-IPM is to characterise the properties of R260 steel under cyclic loading in the very high cycle fatigue regime.
Research project (§ 26 & § 27)
Duration : 2020-09-01 - 2023-08-31

Spider silk (SPSI) has been established as one of nature’s most fascinating materials due to its unique properties. A remarkable application of the SPSI is its use in reconstructive medicine as nerve guidance structure/filament for nerve regeneration. The Schwann cells (SCs), which are a crucial part of the nerve regeneration process adhere to SPSI and migrate along it to support axonal elongation. SPSI degrades without inflammatory response or physiological pH changes. However, the interaction between the SCs and the silk and by that the SPSI properties, that promote SC adhesion are still unclear. The aim of this project is to elucidate material properties of SPSI, that are crucial for its unique performance in nerve regeneration. Not all spider silks show the same medical success, and we believe that properties such as composition, ultrastructure, and mechanical behavior have a pronounced influence on the acceptance of SPSI by SCs. Therefore, by combining experiments consisting of in vitro studies and the material characterization of various SPSIs, the properties, which are responsible for the advanced success of SPSI in nerve regeneration, will be clarified.
Research project (§ 26 & § 27)
Duration : 2019-02-01 - 2022-01-31

Bio-resorbable tissue replacements have moved into the focus of research in recent years. Particularly promising candidates for bone implants are magnesium-based alloys, whose biocompatibility and principal suitability as implant material have been demonstrated. Since bone is a complex, highly adaptive material and known to react to mechanical stimuli and chemical influences, implant placement and successive degradation can be expected to alter the bone structure, which is also supported by our preliminary results. Nevertheless a detailed study of the multilevel structural changes of bone during degradation of resorbable implants is still missing. This is of greatest scientific interest because it represents a model system for bone response to a continuously changing healing front and changing load situation. It is also of prime importance for future clinical use of bio-resorbable implants and optimization of medical treatment. The main aim of this project is therefore to elucidate the multiscale structural changes in bone caused by a degrading Mg-implant, the correlation of structural changes with changing loading patterns and studying the consequences for the mechanical performance of bone.

Supervised Theses and Dissertations